| Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($)$ in Thousands
 | 12 Months Ended |  |  |  | 
| Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | 
| Real Estate and Accumulated Depreciation |  |  |  |  | 
| Encumbrances | $ 121,425 |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 720,485 |  |  |  | 
| Building and Land Improvements | 3,635,390 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 603,834 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 720,485 |  |  |  | 
| Building and Land Improvements | 4,239,224 |  |  |  | 
| Total | 4,959,709 | $ 4,686,802 | $ 4,348,006 | $ 4,148,529 | 
| Accumulated Depreciation | (1,234,908) | (1,124,253) | $ (1,007,120) | $ (897,903) | 
| Additional information |  |  |  |  | 
| Debt, net | 2,272,304 | 2,086,918 |  |  | 
| Net discounts and deferred financing costs | 26,000 |  |  |  | 
| Aggregate cost of assets for federal income tax purposes | $ 3,700,000 |  |  |  | 
| Buildings improvements | Minimum |  |  |  |  | 
| Additional information |  |  |  |  | 
| Estimated lives over which depreciation is recognized | 10 years |  |  |  | 
| Buildings improvements | Maximum |  |  |  |  | 
| Additional information |  |  |  |  | 
| Estimated lives over which depreciation is recognized | 40 years |  |  |  | 
| Revolving Credit Facility |  |  |  |  | 
| Additional information |  |  |  |  | 
| Debt, net | $ 76,000 | 143,000 |  |  | 
| Term Loan Facility |  |  |  |  | 
| Additional information |  |  |  |  | 
| Debt, net | 299,420 | $ 398,447 |  |  | 
| Unsecured Senior Notes |  |  |  |  | 
| Additional information |  |  |  |  | 
| Debt, net | 1,800,000 |  |  |  | 
| Unsecured notes payable |  |  |  |  | 
| Additional information |  |  |  |  | 
| Debt, net | 753 |  |  |  | 
| Fixed rate mortgage loans |  |  |  |  | 
| Additional information |  |  |  |  | 
| Net discounts and deferred financing costs | 798 |  |  |  | 
| 100 Light Street |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 26,715 |  |  |  | 
| Building and Land Improvements | 58,002 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 36,662 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 26,715 |  |  |  | 
| Building and Land Improvements | 94,664 |  |  |  | 
| Total | 121,379 |  |  |  | 
| Accumulated Depreciation | (25,616) |  |  |  | 
| 100 Secured Gateway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 71,089 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 71,089 |  |  |  | 
| Total | 71,089 |  |  |  | 
| Accumulated Depreciation | (2,340) |  |  |  | 
| 1000 Redstone Gateway |  |  |  |  | 
| Real Estate and Accumulated Depreciation |  |  |  |  | 
| Encumbrances | 9,281 |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 20,533 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 76 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 20,609 |  |  |  | 
| Total | 20,609 |  |  |  | 
| Accumulated Depreciation | (4,525) |  |  |  | 
| 1100 Redstone Gateway |  |  |  |  | 
| Real Estate and Accumulated Depreciation |  |  |  |  | 
| Encumbrances | 9,913 |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 19,593 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 88 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 19,681 |  |  |  | 
| Total | 19,681 |  |  |  | 
| Accumulated Depreciation | (3,912) |  |  |  | 
| 114 National Business Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 364 |  |  |  | 
| Building and Land Improvements | 3,109 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 404 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 364 |  |  |  | 
| Building and Land Improvements | 3,513 |  |  |  | 
| Total | 3,877 |  |  |  | 
| Accumulated Depreciation | (1,679) |  |  |  | 
| 1200 Redstone Gateway |  |  |  |  | 
| Real Estate and Accumulated Depreciation |  |  |  |  | 
| Encumbrances | 11,441 |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 22,389 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 141 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 22,530 |  |  |  | 
| Total | 22,530 |  |  |  | 
| Accumulated Depreciation | (4,509) |  |  |  | 
| 1201 M Street SE |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 49,775 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 10,290 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 60,065 |  |  |  | 
| Total | 60,065 |  |  |  | 
| Accumulated Depreciation | (21,051) |  |  |  | 
| 1201 Winterson Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,130 |  |  |  | 
| Building and Land Improvements | 17,009 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 901 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,130 |  |  |  | 
| Building and Land Improvements | 17,910 |  |  |  | 
| Total | 20,040 |  |  |  | 
| Accumulated Depreciation | (5,952) |  |  |  | 
| 1220 12th Street, SE |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 42,464 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 9,749 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 52,213 |  |  |  | 
| Total | 52,213 |  |  |  | 
| Accumulated Depreciation | (19,797) |  |  |  | 
| 1243 Winterson Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 630 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 630 |  |  |  | 
| Total | 630 |  |  |  | 
| 131 National Business Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,906 |  |  |  | 
| Building and Land Improvements | 7,623 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 5,893 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,906 |  |  |  | 
| Building and Land Improvements | 13,516 |  |  |  | 
| Total | 15,422 |  |  |  | 
| Accumulated Depreciation | (7,872) |  |  |  | 
| 132 National Business Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,917 |  |  |  | 
| Building and Land Improvements | 12,259 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 4,876 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,917 |  |  |  | 
| Building and Land Improvements | 17,135 |  |  |  | 
| Total | 20,052 |  |  |  | 
| Accumulated Depreciation | (11,075) |  |  |  | 
| 133 National Business Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,517 |  |  |  | 
| Building and Land Improvements | 10,068 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 6,731 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,517 |  |  |  | 
| Building and Land Improvements | 16,799 |  |  |  | 
| Total | 19,316 |  |  |  | 
| Accumulated Depreciation | (10,935) |  |  |  | 
| 134 National Business Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,684 |  |  |  | 
| Building and Land Improvements | 7,517 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 5,726 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,684 |  |  |  | 
| Building and Land Improvements | 13,243 |  |  |  | 
| Total | 16,927 |  |  |  | 
| Accumulated Depreciation | (8,014) |  |  |  | 
| 1340 Ashton Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 905 |  |  |  | 
| Building and Land Improvements | 3,620 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,540 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 905 |  |  |  | 
| Building and Land Improvements | 6,160 |  |  |  | 
| Total | 7,065 |  |  |  | 
| Accumulated Depreciation | (3,423) |  |  |  | 
| 13450 Sunrise Valley Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,386 |  |  |  | 
| Building and Land Improvements | 5,576 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 4,952 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,386 |  |  |  | 
| Building and Land Improvements | 10,528 |  |  |  | 
| Total | 11,914 |  |  |  | 
| Accumulated Depreciation | (6,583) |  |  |  | 
| 13454 Sunrise Valley Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,847 |  |  |  | 
| Building and Land Improvements | 11,986 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 9,240 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,847 |  |  |  | 
| Building and Land Improvements | 21,226 |  |  |  | 
| Total | 24,073 |  |  |  | 
| Accumulated Depreciation | (12,918) |  |  |  | 
| 135 National Business Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,484 |  |  |  | 
| Building and Land Improvements | 9,750 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 7,003 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,484 |  |  |  | 
| Building and Land Improvements | 16,753 |  |  |  | 
| Total | 19,237 |  |  |  | 
| Accumulated Depreciation | (10,779) |  |  |  | 
| 1362 Mellon Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 950 |  |  |  | 
| Building and Land Improvements | 3,864 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,632 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 950 |  |  |  | 
| Building and Land Improvements | 5,496 |  |  |  | 
| Total | 6,446 |  |  |  | 
| Accumulated Depreciation | (1,193) |  |  |  | 
| 13857 McLearen Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,507 |  |  |  | 
| Building and Land Improvements | 30,177 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 4,915 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,507 |  |  |  | 
| Building and Land Improvements | 35,092 |  |  |  | 
| Total | 38,599 |  |  |  | 
| Accumulated Depreciation | (13,842) |  |  |  | 
| 140 National Business Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,407 |  |  |  | 
| Building and Land Improvements | 24,167 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,784 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,407 |  |  |  | 
| Building and Land Improvements | 25,951 |  |  |  | 
| Total | 29,358 |  |  |  | 
| Accumulated Depreciation | (11,646) |  |  |  | 
| 141 National Business Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,398 |  |  |  | 
| Building and Land Improvements | 9,538 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 4,832 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,398 |  |  |  | 
| Building and Land Improvements | 14,370 |  |  |  | 
| Total | 16,768 |  |  |  | 
| Accumulated Depreciation | (9,758) |  |  |  | 
| 14280 Park Meadow Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,731 |  |  |  | 
| Building and Land Improvements | 15,953 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 5,500 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,731 |  |  |  | 
| Building and Land Improvements | 21,453 |  |  |  | 
| Total | 25,184 |  |  |  | 
| Accumulated Depreciation | (10,469) |  |  |  | 
| 1460 Dorsey Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,577 |  |  |  | 
| Building and Land Improvements | 115 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,577 |  |  |  | 
| Building and Land Improvements | 115 |  |  |  | 
| Total | 1,692 |  |  |  | 
| 14840 Conference Center Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,572 |  |  |  | 
| Building and Land Improvements | 8,175 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 5,730 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,572 |  |  |  | 
| Building and Land Improvements | 13,905 |  |  |  | 
| Total | 15,477 |  |  |  | 
| Accumulated Depreciation | (7,895) |  |  |  | 
| 14850 Conference Center Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,615 |  |  |  | 
| Building and Land Improvements | 8,358 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 5,345 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,615 |  |  |  | 
| Building and Land Improvements | 13,703 |  |  |  | 
| Total | 15,318 |  |  |  | 
| Accumulated Depreciation | (7,455) |  |  |  | 
| 14900 Conference Center Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,436 |  |  |  | 
| Building and Land Improvements | 14,402 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 9,282 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,436 |  |  |  | 
| Building and Land Improvements | 23,684 |  |  |  | 
| Total | 27,120 |  |  |  | 
| Accumulated Depreciation | (14,024) |  |  |  | 
| 1501 South Clinton Street |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 27,964 |  |  |  | 
| Building and Land Improvements | 51,990 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 23,731 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 27,964 |  |  |  | 
| Building and Land Improvements | 75,721 |  |  |  | 
| Total | 103,685 |  |  |  | 
| Accumulated Depreciation | (31,475) |  |  |  | 
| 15049 Conference Center Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 4,415 |  |  |  | 
| Building and Land Improvements | 20,365 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 17,846 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 4,415 |  |  |  | 
| Building and Land Improvements | 38,211 |  |  |  | 
| Total | 42,626 |  |  |  | 
| Accumulated Depreciation | (20,360) |  |  |  | 
| 15059 Conference Center Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 5,753 |  |  |  | 
| Building and Land Improvements | 13,615 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 4,543 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 5,753 |  |  |  | 
| Building and Land Improvements | 18,158 |  |  |  | 
| Total | 23,911 |  |  |  | 
| Accumulated Depreciation | (10,774) |  |  |  | 
| 1550 West Nursery Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 14,071 |  |  |  | 
| Building and Land Improvements | 16,930 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 14,071 |  |  |  | 
| Building and Land Improvements | 16,930 |  |  |  | 
| Total | 31,001 |  |  |  | 
| Accumulated Depreciation | (6,678) |  |  |  | 
| 1560 West Nursery Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,441 |  |  |  | 
| Building and Land Improvements | 113 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,441 |  |  |  | 
| Building and Land Improvements | 113 |  |  |  | 
| Total | 1,554 |  |  |  | 
| Accumulated Depreciation | (22) |  |  |  | 
| 1610 West Nursery Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 259 |  |  |  | 
| Building and Land Improvements | 246 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 259 |  |  |  | 
| Building and Land Improvements | 246 |  |  |  | 
| Total | 505 |  |  |  | 
| Accumulated Depreciation | (29) |  |  |  | 
| 1616 West Nursery Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 393 |  |  |  | 
| Building and Land Improvements | 3,323 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 75 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 393 |  |  |  | 
| Building and Land Improvements | 3,398 |  |  |  | 
| Total | 3,791 |  |  |  | 
| Accumulated Depreciation | (358) |  |  |  | 
| 1622 West Nursery Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 393 |  |  |  | 
| Building and Land Improvements | 2,542 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 393 |  |  |  | 
| Building and Land Improvements | 2,542 |  |  |  | 
| Total | 2,935 |  |  |  | 
| Accumulated Depreciation | (308) |  |  |  | 
| 16442 Commerce Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 613 |  |  |  | 
| Building and Land Improvements | 2,582 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,135 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 613 |  |  |  | 
| Building and Land Improvements | 3,717 |  |  |  | 
| Total | 4,330 |  |  |  | 
| Accumulated Depreciation | (1,988) |  |  |  | 
| 16480 Commerce Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,856 |  |  |  | 
| Building and Land Improvements | 7,425 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,619 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,856 |  |  |  | 
| Building and Land Improvements | 10,044 |  |  |  | 
| Total | 11,900 |  |  |  | 
| Accumulated Depreciation | (4,754) |  |  |  | 
| 16501 Commerce Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 522 |  |  |  | 
| Building and Land Improvements | 2,090 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,040 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 522 |  |  |  | 
| Building and Land Improvements | 3,130 |  |  |  | 
| Total | 3,652 |  |  |  | 
| Accumulated Depreciation | (1,544) |  |  |  | 
| 16539 Commerce Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 688 |  |  |  | 
| Building and Land Improvements | 2,860 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,326 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 688 |  |  |  | 
| Building and Land Improvements | 5,186 |  |  |  | 
| Total | 5,874 |  |  |  | 
| Accumulated Depreciation | (3,058) |  |  |  | 
| 16541 Commerce Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 773 |  |  |  | 
| Building and Land Improvements | 3,094 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,596 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 773 |  |  |  | 
| Building and Land Improvements | 5,690 |  |  |  | 
| Total | 6,463 |  |  |  | 
| Accumulated Depreciation | (2,989) |  |  |  | 
| 16543 Commerce Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 436 |  |  |  | 
| Building and Land Improvements | 1,742 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 838 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 436 |  |  |  | 
| Building and Land Improvements | 2,580 |  |  |  | 
| Total | 3,016 |  |  |  | 
| Accumulated Depreciation | (1,348) |  |  |  | 
| 1751 Pinnacle Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 10,486 |  |  |  | 
| Building and Land Improvements | 42,339 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 33,825 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 10,486 |  |  |  | 
| Building and Land Improvements | 76,164 |  |  |  | 
| Total | 86,650 |  |  |  | 
| Accumulated Depreciation | (42,720) |  |  |  | 
| 1753 Pinnacle Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 8,275 |  |  |  | 
| Building and Land Improvements | 34,353 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 24,092 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 8,275 |  |  |  | 
| Building and Land Improvements | 58,445 |  |  |  | 
| Total | 66,720 |  |  |  | 
| Accumulated Depreciation | (28,325) |  |  |  | 
| 206 Research Boulevard |  |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Total | 0 |  |  |  | 
| 209 Research Boulevard |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 134 |  |  |  | 
| Building and Land Improvements | 1,711 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 543 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 134 |  |  |  | 
| Building and Land Improvements | 2,254 |  |  |  | 
| Total | 2,388 |  |  |  | 
| Accumulated Depreciation | (687) |  |  |  | 
| 210 Research Boulevard |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 113 |  |  |  | 
| Building and Land Improvements | 1,402 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 426 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 113 |  |  |  | 
| Building and Land Improvements | 1,828 |  |  |  | 
| Total | 1,941 |  |  |  | 
| Accumulated Depreciation | (543) |  |  |  | 
| 2100 L Street |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 57,385 |  |  |  | 
| Building and Land Improvements | 94,152 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 57,385 |  |  |  | 
| Building and Land Improvements | 94,152 |  |  |  | 
| Total | 151,537 |  |  |  | 
| Accumulated Depreciation | (1,987) |  |  |  | 
| 2100 Rideout Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 7,336 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,995 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 10,331 |  |  |  | 
| Total | 10,331 |  |  |  | 
| Accumulated Depreciation | (2,274) |  |  |  | 
| 22289 Exploration Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,422 |  |  |  | 
| Building and Land Improvements | 5,719 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,129 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,422 |  |  |  | 
| Building and Land Improvements | 7,848 |  |  |  | 
| Total | 9,270 |  |  |  | 
| Accumulated Depreciation | (4,369) |  |  |  | 
| 22299 Exploration Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,362 |  |  |  | 
| Building and Land Improvements | 5,791 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 3,049 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,362 |  |  |  | 
| Building and Land Improvements | 8,840 |  |  |  | 
| Total | 10,202 |  |  |  | 
| Accumulated Depreciation | (5,297) |  |  |  | 
| 22300 Exploration Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,094 |  |  |  | 
| Building and Land Improvements | 5,038 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,770 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,094 |  |  |  | 
| Building and Land Improvements | 7,808 |  |  |  | 
| Total | 8,902 |  |  |  | 
| Accumulated Depreciation | (4,134) |  |  |  | 
| 22309 Exploration Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,243 |  |  |  | 
| Building and Land Improvements | 10,419 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 8,114 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,243 |  |  |  | 
| Building and Land Improvements | 18,533 |  |  |  | 
| Total | 20,776 |  |  |  | 
| Accumulated Depreciation | (8,947) |  |  |  | 
| 23535 Cottonwood Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 692 |  |  |  | 
| Building and Land Improvements | 3,051 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 648 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 692 |  |  |  | 
| Building and Land Improvements | 3,699 |  |  |  | 
| Total | 4,391 |  |  |  | 
| Accumulated Depreciation | (2,193) |  |  |  | 
| 250 W Pratt St |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 8,057 |  |  |  | 
| Building and Land Improvements | 34,588 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 18,482 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 8,057 |  |  |  | 
| Building and Land Improvements | 53,070 |  |  |  | 
| Total | 61,127 |  |  |  | 
| Accumulated Depreciation | (18,418) |  |  |  | 
| 2600 Park Tower Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 20,284 |  |  |  | 
| Building and Land Improvements | 34,443 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 4,621 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 20,284 |  |  |  | 
| Building and Land Improvements | 39,064 |  |  |  | 
| Total | 59,348 |  |  |  | 
| Accumulated Depreciation | (8,392) |  |  |  | 
| 2691 Technology Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,098 |  |  |  | 
| Building and Land Improvements | 17,334 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 5,565 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,098 |  |  |  | 
| Building and Land Improvements | 22,899 |  |  |  | 
| Total | 24,997 |  |  |  | 
| Accumulated Depreciation | (12,224) |  |  |  | 
| 2701 Technology Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,737 |  |  |  | 
| Building and Land Improvements | 15,266 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 7,033 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,737 |  |  |  | 
| Building and Land Improvements | 22,299 |  |  |  | 
| Total | 24,036 |  |  |  | 
| Accumulated Depreciation | (13,380) |  |  |  | 
| 2711 Technology Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,251 |  |  |  | 
| Building and Land Improvements | 21,611 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 4,335 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,251 |  |  |  | 
| Building and Land Improvements | 25,946 |  |  |  | 
| Total | 28,197 |  |  |  | 
| Accumulated Depreciation | (14,988) |  |  |  | 
| 2720 Technology Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,863 |  |  |  | 
| Building and Land Improvements | 29,272 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,897 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,863 |  |  |  | 
| Building and Land Improvements | 32,169 |  |  |  | 
| Total | 36,032 |  |  |  | 
| Accumulated Depreciation | (14,204) |  |  |  | 
| 2721 Technology Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 4,611 |  |  |  | 
| Building and Land Improvements | 14,597 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 3,783 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 4,611 |  |  |  | 
| Building and Land Improvements | 18,380 |  |  |  | 
| Total | 22,991 |  |  |  | 
| Accumulated Depreciation | (10,792) |  |  |  | 
| 2730 Hercules Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 8,737 |  |  |  | 
| Building and Land Improvements | 31,612 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 8,998 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 8,737 |  |  |  | 
| Building and Land Improvements | 40,610 |  |  |  | 
| Total | 49,347 |  |  |  | 
| Accumulated Depreciation | (23,935) |  |  |  | 
| 30 Light Street |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 12,101 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,008 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 13,109 |  |  |  | 
| Total | 13,109 |  |  |  | 
| Accumulated Depreciation | (2,308) |  |  |  | 
| 300 Secured Gateway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 3,128 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 3,128 |  |  |  | 
| Total | 3,128 |  |  |  | 
| 300 Sentinel Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,517 |  |  |  | 
| Building and Land Improvements | 59,165 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,569 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,517 |  |  |  | 
| Building and Land Improvements | 61,734 |  |  |  | 
| Total | 63,251 |  |  |  | 
| Accumulated Depreciation | (18,370) |  |  |  | 
| 302 Sentinel Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,648 |  |  |  | 
| Building and Land Improvements | 29,687 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,293 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,648 |  |  |  | 
| Building and Land Improvements | 31,980 |  |  |  | 
| Total | 34,628 |  |  |  | 
| Accumulated Depreciation | (10,987) |  |  |  | 
| 304 Sentinel Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,411 |  |  |  | 
| Building and Land Improvements | 24,917 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 4,875 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,411 |  |  |  | 
| Building and Land Improvements | 29,792 |  |  |  | 
| Total | 33,203 |  |  |  | 
| Accumulated Depreciation | (12,067) |  |  |  | 
| 306 Sentinel Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,260 |  |  |  | 
| Building and Land Improvements | 22,592 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 3,303 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,260 |  |  |  | 
| Building and Land Improvements | 25,895 |  |  |  | 
| Total | 29,155 |  |  |  | 
| Accumulated Depreciation | (10,098) |  |  |  | 
| 308 Sentinel Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,422 |  |  |  | 
| Building and Land Improvements | 26,208 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,354 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,422 |  |  |  | 
| Building and Land Improvements | 28,562 |  |  |  | 
| Total | 29,984 |  |  |  | 
| Accumulated Depreciation | (7,882) |  |  |  | 
| 310 Sentinel Way |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,372 |  |  |  | 
| Building and Land Improvements | 42,591 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,372 |  |  |  | 
| Building and Land Improvements | 42,591 |  |  |  | 
| Total | 44,963 |  |  |  | 
| Accumulated Depreciation | (6,103) |  |  |  | 
| 310 The Bridge Street |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 261 |  |  |  | 
| Building and Land Improvements | 26,530 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 5,227 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 261 |  |  |  | 
| Building and Land Improvements | 31,757 |  |  |  | 
| Total | 32,018 |  |  |  | 
| Accumulated Depreciation | (12,236) |  |  |  | 
| 312 Sentinel Way |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,138 |  |  |  | 
| Building and Land Improvements | 27,797 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,138 |  |  |  | 
| Building and Land Improvements | 27,797 |  |  |  | 
| Total | 30,935 |  |  |  | 
| Accumulated Depreciation | (5,084) |  |  |  | 
| 314 Sentinel Way |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,254 |  |  |  | 
| Building and Land Improvements | 7,741 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,254 |  |  |  | 
| Building and Land Improvements | 7,741 |  |  |  | 
| Total | 8,995 |  |  |  | 
| Accumulated Depreciation | (1,480) |  |  |  | 
| 316 Sentinel Way |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,748 |  |  |  | 
| Building and Land Improvements | 38,156 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 193 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,748 |  |  |  | 
| Building and Land Improvements | 38,349 |  |  |  | 
| Total | 41,097 |  |  |  | 
| Accumulated Depreciation | (9,410) |  |  |  | 
| 318 Sentinel Way |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,185 |  |  |  | 
| Building and Land Improvements | 28,426 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 560 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,185 |  |  |  | 
| Building and Land Improvements | 28,986 |  |  |  | 
| Total | 31,171 |  |  |  | 
| Accumulated Depreciation | (11,482) |  |  |  | 
| 320 Sentinel Way |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,067 |  |  |  | 
| Building and Land Improvements | 21,623 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 127 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,067 |  |  |  | 
| Building and Land Improvements | 21,750 |  |  |  | 
| Total | 23,817 |  |  |  | 
| Accumulated Depreciation | (7,606) |  |  |  | 
| 322 Sentinel Way |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,605 |  |  |  | 
| Building and Land Improvements | 22,827 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,910 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,605 |  |  |  | 
| Building and Land Improvements | 24,737 |  |  |  | 
| Total | 27,342 |  |  |  | 
| Accumulated Depreciation | (9,329) |  |  |  | 
| 324 Sentinel Way |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,656 |  |  |  | 
| Building and Land Improvements | 23,018 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 6 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,656 |  |  |  | 
| Building and Land Improvements | 23,024 |  |  |  | 
| Total | 24,680 |  |  |  | 
| Accumulated Depreciation | (6,531) |  |  |  | 
| 4000 Market Street |  |  |  |  | 
| Real Estate and Accumulated Depreciation |  |  |  |  | 
| Encumbrances | 6,052 |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 9,187 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 9,187 |  |  |  | 
| Total | 9,187 |  |  |  | 
| Accumulated Depreciation | (626) |  |  |  | 
| 410 National Business Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,831 |  |  |  | 
| Building and Land Improvements | 23,257 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,259 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,831 |  |  |  | 
| Building and Land Improvements | 25,516 |  |  |  | 
| Total | 27,347 |  |  |  | 
| Accumulated Depreciation | (6,032) |  |  |  | 
| 4100 Market Street |  |  |  |  | 
| Real Estate and Accumulated Depreciation |  |  |  |  | 
| Encumbrances | 5,269 |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 8,020 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 7 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 8,027 |  |  |  | 
| Total | 8,027 |  |  |  | 
| Accumulated Depreciation | (506) |  |  |  | 
| 420 National Business Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,370 |  |  |  | 
| Building and Land Improvements | 29,534 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 148 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,370 |  |  |  | 
| Building and Land Improvements | 29,682 |  |  |  | 
| Total | 32,052 |  |  |  | 
| Accumulated Depreciation | (5,467) |  |  |  | 
| 430 National Business Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,852 |  |  |  | 
| Building and Land Improvements | 21,563 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,893 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,852 |  |  |  | 
| Building and Land Improvements | 23,456 |  |  |  | 
| Total | 25,308 |  |  |  | 
| Accumulated Depreciation | (5,746) |  |  |  | 
| 44408 Pecan Court |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 817 |  |  |  | 
| Building and Land Improvements | 1,583 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,751 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 817 |  |  |  | 
| Building and Land Improvements | 3,334 |  |  |  | 
| Total | 4,151 |  |  |  | 
| Accumulated Depreciation | (1,983) |  |  |  | 
| 44414 Pecan Court |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 405 |  |  |  | 
| Building and Land Improvements | 1,619 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,138 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 405 |  |  |  | 
| Building and Land Improvements | 2,757 |  |  |  | 
| Total | 3,162 |  |  |  | 
| Accumulated Depreciation | (1,686) |  |  |  | 
| 44417 Pecan Court |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 434 |  |  |  | 
| Building and Land Improvements | 3,822 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 180 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 434 |  |  |  | 
| Building and Land Improvements | 4,002 |  |  |  | 
| Total | 4,436 |  |  |  | 
| Accumulated Depreciation | (2,195) |  |  |  | 
| 44420 Pecan Court |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 344 |  |  |  | 
| Building and Land Improvements | 890 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 291 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 344 |  |  |  | 
| Building and Land Improvements | 1,181 |  |  |  | 
| Total | 1,525 |  |  |  | 
| Accumulated Depreciation | (607) |  |  |  | 
| 44425 Pecan Court |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,309 |  |  |  | 
| Building and Land Improvements | 3,506 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,394 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,309 |  |  |  | 
| Building and Land Improvements | 5,900 |  |  |  | 
| Total | 7,209 |  |  |  | 
| Accumulated Depreciation | (3,757) |  |  |  | 
| 45310 Abell House Lane |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,272 |  |  |  | 
| Building and Land Improvements | 13,808 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 878 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,272 |  |  |  | 
| Building and Land Improvements | 14,686 |  |  |  | 
| Total | 16,958 |  |  |  | 
| Accumulated Depreciation | (3,888) |  |  |  | 
| 4600 River Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 24,032 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 24,032 |  |  |  | 
| Total | 24,032 |  |  |  | 
| Accumulated Depreciation | (436) |  |  |  | 
| 46579 Expedition Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,406 |  |  |  | 
| Building and Land Improvements | 5,796 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,874 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,406 |  |  |  | 
| Building and Land Improvements | 8,670 |  |  |  | 
| Total | 10,076 |  |  |  | 
| Accumulated Depreciation | (4,563) |  |  |  | 
| 46591 Expedition Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,200 |  |  |  | 
| Building and Land Improvements | 7,199 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 3,408 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,200 |  |  |  | 
| Building and Land Improvements | 10,607 |  |  |  | 
| Total | 11,807 |  |  |  | 
| Accumulated Depreciation | (4,557) |  |  |  | 
| 4851 Stonecroft Boulevard |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,878 |  |  |  | 
| Building and Land Improvements | 11,558 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 194 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,878 |  |  |  | 
| Building and Land Improvements | 11,752 |  |  |  | 
| Total | 13,630 |  |  |  | 
| Accumulated Depreciation | (5,001) |  |  |  | 
| 540 National Business Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,035 |  |  |  | 
| Building and Land Improvements | 31,249 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 41 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,035 |  |  |  | 
| Building and Land Improvements | 31,290 |  |  |  | 
| Total | 33,325 |  |  |  | 
| Accumulated Depreciation | (3,321) |  |  |  | 
| 5520 Research Park Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 20,072 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,757 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 21,829 |  |  |  | 
| Total | 21,829 |  |  |  | 
| Accumulated Depreciation | (7,078) |  |  |  | 
| 5522 Research Park Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 4,550 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 855 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 5,405 |  |  |  | 
| Total | 5,405 |  |  |  | 
| Accumulated Depreciation | (1,851) |  |  |  | 
| 560 National Business Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,193 |  |  |  | 
| Building and Land Improvements | 28,973 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,193 |  |  |  | 
| Building and Land Improvements | 28,973 |  |  |  | 
| Total | 31,166 |  |  |  | 
| 5801 University Research Court |  |  |  |  | 
| Real Estate and Accumulated Depreciation |  |  |  |  | 
| Encumbrances | 11,120 |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 17,431 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 144 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 17,575 |  |  |  | 
| Total | 17,575 |  |  |  | 
| Accumulated Depreciation | (1,772) |  |  |  | 
| 5825 University Research Court |  |  |  |  | 
| Real Estate and Accumulated Depreciation |  |  |  |  | 
| Encumbrances | 19,552 |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 22,771 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,678 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 24,449 |  |  |  | 
| Total | 24,449 |  |  |  | 
| Accumulated Depreciation | (8,014) |  |  |  | 
| 5850 University Research Court |  |  |  |  | 
| Real Estate and Accumulated Depreciation |  |  |  |  | 
| Encumbrances | 20,686 |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 31,906 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 894 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 32,800 |  |  |  | 
| Total | 32,800 |  |  |  | 
| Accumulated Depreciation | (9,746) |  |  |  | 
| 6000 Redstone Gateway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 8,550 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 8,550 |  |  |  | 
| Total | 8,550 |  |  |  | 
| Accumulated Depreciation | (201) |  |  |  | 
| 610 Guardian Way |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 7,636 |  |  |  | 
| Building and Land Improvements | 49,873 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 7,636 |  |  |  | 
| Building and Land Improvements | 49,873 |  |  |  | 
| Total | 57,509 |  |  |  | 
| Accumulated Depreciation | (276) |  |  |  | 
| 6200 Redstone Gateway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 14,067 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 14,067 |  |  |  | 
| Total | 14,067 |  |  |  | 
| 6700 Alexander Bell Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,755 |  |  |  | 
| Building and Land Improvements | 7,019 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 9,541 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,755 |  |  |  | 
| Building and Land Improvements | 16,560 |  |  |  | 
| Total | 18,315 |  |  |  | 
| Accumulated Depreciation | (9,466) |  |  |  | 
| 6708 Alexander Bell Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 897 |  |  |  | 
| Building and Land Improvements | 12,693 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,618 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 897 |  |  |  | 
| Building and Land Improvements | 14,311 |  |  |  | 
| Total | 15,208 |  |  |  | 
| Accumulated Depreciation | (4,956) |  |  |  | 
| 6711 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,683 |  |  |  | 
| Building and Land Improvements | 23,239 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,258 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,683 |  |  |  | 
| Building and Land Improvements | 25,497 |  |  |  | 
| Total | 28,180 |  |  |  | 
| Accumulated Depreciation | (9,995) |  |  |  | 
| 6716 Alexander Bell Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,242 |  |  |  | 
| Building and Land Improvements | 4,969 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 4,672 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,242 |  |  |  | 
| Building and Land Improvements | 9,641 |  |  |  | 
| Total | 10,883 |  |  |  | 
| Accumulated Depreciation | (6,399) |  |  |  | 
| 6721 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,753 |  |  |  | 
| Building and Land Improvements | 34,090 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 7,318 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,753 |  |  |  | 
| Building and Land Improvements | 41,408 |  |  |  | 
| Total | 43,161 |  |  |  | 
| Accumulated Depreciation | (11,406) |  |  |  | 
| 6724 Alexander Bell Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 449 |  |  |  | 
| Building and Land Improvements | 5,039 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,492 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 449 |  |  |  | 
| Building and Land Improvements | 7,531 |  |  |  | 
| Total | 7,980 |  |  |  | 
| Accumulated Depreciation | (4,042) |  |  |  | 
| 6731 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,807 |  |  |  | 
| Building and Land Improvements | 19,098 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 5,689 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,807 |  |  |  | 
| Building and Land Improvements | 24,787 |  |  |  | 
| Total | 27,594 |  |  |  | 
| Accumulated Depreciation | (14,085) |  |  |  | 
| 6740 Alexander Bell Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,424 |  |  |  | 
| Building and Land Improvements | 4,209 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 757 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,424 |  |  |  | 
| Building and Land Improvements | 4,966 |  |  |  | 
| Total | 6,390 |  |  |  | 
| Accumulated Depreciation | (2,627) |  |  |  | 
| 6741 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 675 |  |  |  | 
| Building and Land Improvements | 1,711 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 176 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 675 |  |  |  | 
| Building and Land Improvements | 1,887 |  |  |  | 
| Total | 2,562 |  |  |  | 
| Accumulated Depreciation | (715) |  |  |  | 
| 6750 Alexander Bell Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,263 |  |  |  | 
| Building and Land Improvements | 12,461 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 5,856 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,263 |  |  |  | 
| Building and Land Improvements | 18,317 |  |  |  | 
| Total | 19,580 |  |  |  | 
| Accumulated Depreciation | (11,133) |  |  |  | 
| 6760 Alexander Bell Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 890 |  |  |  | 
| Building and Land Improvements | 3,561 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 3,915 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 890 |  |  |  | 
| Building and Land Improvements | 7,476 |  |  |  | 
| Total | 8,366 |  |  |  | 
| Accumulated Depreciation | (5,115) |  |  |  | 
| 6940 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,545 |  |  |  | 
| Building and Land Improvements | 9,916 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 9,227 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,545 |  |  |  | 
| Building and Land Improvements | 19,143 |  |  |  | 
| Total | 22,688 |  |  |  | 
| Accumulated Depreciation | (11,631) |  |  |  | 
| 6950 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,596 |  |  |  | 
| Building and Land Improvements | 28,312 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 3,223 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,596 |  |  |  | 
| Building and Land Improvements | 31,535 |  |  |  | 
| Total | 35,131 |  |  |  | 
| Accumulated Depreciation | (12,711) |  |  |  | 
| 7000 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,131 |  |  |  | 
| Building and Land Improvements | 12,103 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 8,551 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,131 |  |  |  | 
| Building and Land Improvements | 20,654 |  |  |  | 
| Total | 23,785 |  |  |  | 
| Accumulated Depreciation | (10,921) |  |  |  | 
| 7000 Redstone Gateway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 897 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 897 |  |  |  | 
| Total | 897 |  |  |  | 
| 7005 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,036 |  |  |  | 
| Building and Land Improvements | 747 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,036 |  |  |  | 
| Building and Land Improvements | 747 |  |  |  | 
| Total | 3,783 |  |  |  | 
| 7015 Albert Einstein Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,058 |  |  |  | 
| Building and Land Improvements | 6,093 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 3,560 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,058 |  |  |  | 
| Building and Land Improvements | 9,653 |  |  |  | 
| Total | 11,711 |  |  |  | 
| Accumulated Depreciation | (5,005) |  |  |  | 
| 7061 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 729 |  |  |  | 
| Building and Land Improvements | 3,094 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,884 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 729 |  |  |  | 
| Building and Land Improvements | 5,978 |  |  |  | 
| Total | 6,707 |  |  |  | 
| Accumulated Depreciation | (3,608) |  |  |  | 
| 7063 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 902 |  |  |  | 
| Building and Land Improvements | 3,684 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 3,470 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 902 |  |  |  | 
| Building and Land Improvements | 7,154 |  |  |  | 
| Total | 8,056 |  |  |  | 
| Accumulated Depreciation | (4,721) |  |  |  | 
| 7065 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 919 |  |  |  | 
| Building and Land Improvements | 3,763 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 3,145 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 919 |  |  |  | 
| Building and Land Improvements | 6,908 |  |  |  | 
| Total | 7,827 |  |  |  | 
| Accumulated Depreciation | (4,703) |  |  |  | 
| 7067 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,829 |  |  |  | 
| Building and Land Improvements | 11,823 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 6,683 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,829 |  |  |  | 
| Building and Land Improvements | 18,506 |  |  |  | 
| Total | 20,335 |  |  |  | 
| Accumulated Depreciation | (9,409) |  |  |  | 
| 7100 Redstone Gateway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 12,975 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 12,975 |  |  |  | 
| Total | 12,975 |  |  |  | 
| Accumulated Depreciation | (204) |  |  |  | 
| 7125 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 20,487 |  |  |  | 
| Building and Land Improvements | 49,844 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 24,637 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 20,487 |  |  |  | 
| Building and Land Improvements | 74,481 |  |  |  | 
| Total | 94,968 |  |  |  | 
| Accumulated Depreciation | (30,038) |  |  |  | 
| 7130 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,350 |  |  |  | 
| Building and Land Improvements | 4,359 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 3,029 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,350 |  |  |  | 
| Building and Land Improvements | 7,388 |  |  |  | 
| Total | 8,738 |  |  |  | 
| Accumulated Depreciation | (4,101) |  |  |  | 
| 7134 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 704 |  |  |  | 
| Building and Land Improvements | 4,700 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 729 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 704 |  |  |  | 
| Building and Land Improvements | 5,429 |  |  |  | 
| Total | 6,133 |  |  |  | 
| Accumulated Depreciation | (1,988) |  |  |  | 
| 7138 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,104 |  |  |  | 
| Building and Land Improvements | 3,518 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,963 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,104 |  |  |  | 
| Building and Land Improvements | 6,481 |  |  |  | 
| Total | 7,585 |  |  |  | 
| Accumulated Depreciation | (4,286) |  |  |  | 
| 7142 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,342 |  |  |  | 
| Building and Land Improvements | 7,148 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,771 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,342 |  |  |  | 
| Building and Land Improvements | 9,919 |  |  |  | 
| Total | 11,261 |  |  |  | 
| Accumulated Depreciation | (4,494) |  |  |  | 
| 7150 Columbia Gateway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,032 |  |  |  | 
| Building and Land Improvements | 3,429 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,705 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,032 |  |  |  | 
| Building and Land Improvements | 5,134 |  |  |  | 
| Total | 6,166 |  |  |  | 
| Accumulated Depreciation | (1,938) |  |  |  | 
| 7150 Riverwood Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,821 |  |  |  | 
| Building and Land Improvements | 4,388 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,953 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,821 |  |  |  | 
| Building and Land Improvements | 6,341 |  |  |  | 
| Total | 8,162 |  |  |  | 
| Accumulated Depreciation | (3,162) |  |  |  | 
| 7160 Riverwood Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,732 |  |  |  | 
| Building and Land Improvements | 7,006 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 4,609 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,732 |  |  |  | 
| Building and Land Improvements | 11,615 |  |  |  | 
| Total | 14,347 |  |  |  | 
| Accumulated Depreciation | (5,300) |  |  |  | 
| 7170 Riverwood Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,283 |  |  |  | 
| Building and Land Improvements | 3,096 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 2,387 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,283 |  |  |  | 
| Building and Land Improvements | 5,483 |  |  |  | 
| Total | 6,766 |  |  |  | 
| Accumulated Depreciation | (2,787) |  |  |  | 
| 7175 Riverwood Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,788 |  |  |  | 
| Building and Land Improvements | 7,269 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,788 |  |  |  | 
| Building and Land Improvements | 7,269 |  |  |  | 
| Total | 9,057 |  |  |  | 
| Accumulated Depreciation | (1,479) |  |  |  | 
| 7200 Redstone Gateway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 8,348 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 81 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 8,429 |  |  |  | 
| Total | 8,429 |  |  |  | 
| Accumulated Depreciation | (1,611) |  |  |  | 
| 7200 Riverwood Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 4,089 |  |  |  | 
| Building and Land Improvements | 22,630 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 4,693 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 4,089 |  |  |  | 
| Building and Land Improvements | 27,323 |  |  |  | 
| Total | 31,412 |  |  |  | 
| Accumulated Depreciation | (13,365) |  |  |  | 
| 7205 Riverwood Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,367 |  |  |  | 
| Building and Land Improvements | 21,419 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,367 |  |  |  | 
| Building and Land Improvements | 21,419 |  |  |  | 
| Total | 22,786 |  |  |  | 
| Accumulated Depreciation | (4,523) |  |  |  | 
| 7272 Park Circle Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,479 |  |  |  | 
| Building and Land Improvements | 6,300 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 4,609 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,479 |  |  |  | 
| Building and Land Improvements | 10,909 |  |  |  | 
| Total | 12,388 |  |  |  | 
| Accumulated Depreciation | (5,971) |  |  |  | 
| 7318 Parkway Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 972 |  |  |  | 
| Building and Land Improvements | 3,888 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,647 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 972 |  |  |  | 
| Building and Land Improvements | 5,535 |  |  |  | 
| Total | 6,507 |  |  |  | 
| Accumulated Depreciation | (3,120) |  |  |  | 
| 7400 Redstone Gateway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 9,223 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 75 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 9,298 |  |  |  | 
| Total | 9,298 |  |  |  | 
| Accumulated Depreciation | (1,519) |  |  |  | 
| 7467 Ridge Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,565 |  |  |  | 
| Building and Land Improvements | 3,116 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 5,997 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,565 |  |  |  | 
| Building and Land Improvements | 9,113 |  |  |  | 
| Total | 10,678 |  |  |  | 
| Accumulated Depreciation | (4,585) |  |  |  | 
| 7500 Advanced Gateway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 18,663 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 18,663 |  |  |  | 
| Total | 18,663 |  |  |  | 
| Accumulated Depreciation | (734) |  |  |  | 
| 7600 Advanced Gateway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 13,752 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 13,752 |  |  |  | 
| Total | 13,752 |  |  |  | 
| Accumulated Depreciation | (482) |  |  |  | 
| 7740 Milestone Parkway |  |  |  |  | 
| Real Estate and Accumulated Depreciation |  |  |  |  | 
| Encumbrances | 16,432 |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,825 |  |  |  | 
| Building and Land Improvements | 34,176 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,254 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,825 |  |  |  | 
| Building and Land Improvements | 35,430 |  |  |  | 
| Total | 39,255 |  |  |  | 
| Accumulated Depreciation | (10,226) |  |  |  | 
| 7770 Backlick Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 6,387 |  |  |  | 
| Building and Land Improvements | 78,891 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,528 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 6,387 |  |  |  | 
| Building and Land Improvements | 80,419 |  |  |  | 
| Total | 86,806 |  |  |  | 
| Accumulated Depreciation | (17,275) |  |  |  | 
| 7880 Milestone Parkway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 4,857 |  |  |  | 
| Building and Land Improvements | 26,836 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,338 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 4,857 |  |  |  | 
| Building and Land Improvements | 28,174 |  |  |  | 
| Total | 33,031 |  |  |  | 
| Accumulated Depreciation | (4,132) |  |  |  | 
| 8000 Rideout Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 21,667 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 21,667 |  |  |  | 
| Total | 21,667 |  |  |  | 
| Accumulated Depreciation | (53) |  |  |  | 
| 8200 Rideout Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 16,890 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 16,890 |  |  |  | 
| Total | 16,890 |  |  |  | 
| 8300 Rideout Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 18,301 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 18,301 |  |  |  | 
| Total | 18,301 |  |  |  | 
| 8600 Advanced Gateway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 27,298 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 27,298 |  |  |  | 
| Total | 27,298 |  |  |  | 
| Accumulated Depreciation | (711) |  |  |  | 
| 8621 Robert Fulton Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,317 |  |  |  | 
| Building and Land Improvements | 12,642 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 6,191 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,317 |  |  |  | 
| Building and Land Improvements | 18,833 |  |  |  | 
| Total | 21,150 |  |  |  | 
| Accumulated Depreciation | (8,822) |  |  |  | 
| 8661 Robert Fulton Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,510 |  |  |  | 
| Building and Land Improvements | 3,764 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 3,302 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,510 |  |  |  | 
| Building and Land Improvements | 7,066 |  |  |  | 
| Total | 8,576 |  |  |  | 
| Accumulated Depreciation | (3,825) |  |  |  | 
| 8671 Robert Fulton Drive |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,718 |  |  |  | 
| Building and Land Improvements | 4,280 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 4,294 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,718 |  |  |  | 
| Building and Land Improvements | 8,574 |  |  |  | 
| Total | 10,292 |  |  |  | 
| Accumulated Depreciation | (5,066) |  |  |  | 
| 870 Elkridge Landing Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,003 |  |  |  | 
| Building and Land Improvements | 9,442 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 10,464 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,003 |  |  |  | 
| Building and Land Improvements | 19,906 |  |  |  | 
| Total | 21,909 |  |  |  | 
| Accumulated Depreciation | (12,706) |  |  |  | 
| 8800 Redstone Gateway |  |  |  |  | 
| Real Estate and Accumulated Depreciation |  |  |  |  | 
| Encumbrances | 11,679 |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 18,465 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 18,465 |  |  |  | 
| Total | 18,465 |  |  |  | 
| Accumulated Depreciation | (974) |  |  |  | 
| 891 Elkridge Landing Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,165 |  |  |  | 
| Building and Land Improvements | 4,772 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 3,844 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,165 |  |  |  | 
| Building and Land Improvements | 8,616 |  |  |  | 
| Total | 9,781 |  |  |  | 
| Accumulated Depreciation | (5,472) |  |  |  | 
| 901 Elkridge Landing Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,156 |  |  |  | 
| Building and Land Improvements | 4,437 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 6,034 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,156 |  |  |  | 
| Building and Land Improvements | 10,471 |  |  |  | 
| Total | 11,627 |  |  |  | 
| Accumulated Depreciation | (5,115) |  |  |  | 
| 911 Elkridge Landing Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,215 |  |  |  | 
| Building and Land Improvements | 4,861 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 3,307 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,215 |  |  |  | 
| Building and Land Improvements | 8,168 |  |  |  | 
| Total | 9,383 |  |  |  | 
| Accumulated Depreciation | (5,116) |  |  |  | 
| 938 Elkridge Landing Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 922 |  |  |  | 
| Building and Land Improvements | 4,748 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,534 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 922 |  |  |  | 
| Building and Land Improvements | 6,282 |  |  |  | 
| Total | 7,204 |  |  |  | 
| Accumulated Depreciation | (3,420) |  |  |  | 
| 939 Elkridge Landing Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 939 |  |  |  | 
| Building and Land Improvements | 3,756 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 4,470 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 939 |  |  |  | 
| Building and Land Improvements | 8,226 |  |  |  | 
| Total | 9,165 |  |  |  | 
| Accumulated Depreciation | (6,064) |  |  |  | 
| 9651 Hornbaker Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 6,050 |  |  |  | 
| Building and Land Improvements | 250,407 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 17,785 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 6,050 |  |  |  | 
| Building and Land Improvements | 268,192 |  |  |  | 
| Total | 274,242 |  |  |  | 
| Accumulated Depreciation | (82,385) |  |  |  | 
| Arundel Preserve |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 13,352 |  |  |  | 
| Building and Land Improvements | 9,717 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 13,352 |  |  |  | 
| Building and Land Improvements | 9,717 |  |  |  | 
| Total | 23,069 |  |  |  | 
| Canton Crossing Land |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 17,285 |  |  |  | 
| Building and Land Improvements | 8,409 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 227 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 17,285 |  |  |  | 
| Building and Land Improvements | 8,636 |  |  |  | 
| Total | 25,921 |  |  |  | 
| Canton Crossing Util Distr Ctr |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 6,100 |  |  |  | 
| Building and Land Improvements | 10,450 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 1,689 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 6,100 |  |  |  | 
| Building and Land Improvements | 12,139 |  |  |  | 
| Total | 18,239 |  |  |  | 
| Accumulated Depreciation | (6,887) |  |  |  | 
| Columbia Gateway - Southridge |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 6,387 |  |  |  | 
| Building and Land Improvements | 3,722 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 6,387 |  |  |  | 
| Building and Land Improvements | 3,722 |  |  |  | 
| Total | 10,109 |  |  |  | 
| Dahlgren Technology Center |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 978 |  |  |  | 
| Building and Land Improvements | 178 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 978 |  |  |  | 
| Building and Land Improvements | 178 |  |  |  | 
| Total | 1,156 |  |  |  | 
| Expedition VII |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 705 |  |  |  | 
| Building and Land Improvements | 7,208 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 705 |  |  |  | 
| Building and Land Improvements | 7,208 |  |  |  | 
| Total | 7,913 |  |  |  | 
| IN 1 |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,815 |  |  |  | 
| Building and Land Improvements | 16,017 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,815 |  |  |  | 
| Building and Land Improvements | 16,017 |  |  |  | 
| Total | 17,832 |  |  |  | 
| Accumulated Depreciation | (1,136) |  |  |  | 
| IN 2 |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,627 |  |  |  | 
| Building and Land Improvements | 28,936 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,627 |  |  |  | 
| Building and Land Improvements | 28,936 |  |  |  | 
| Total | 31,563 |  |  |  | 
| Accumulated Depreciation | (1,804) |  |  |  | 
| M Square Research Park |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 2,417 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 2,417 |  |  |  | 
| Total | 2,417 |  |  |  | 
| MR Land |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 9,038 |  |  |  | 
| Building and Land Improvements | 554 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 9,038 |  |  |  | 
| Building and Land Improvements | 554 |  |  |  | 
| Total | 9,592 |  |  |  | 
| National Business Park North |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 18,232 |  |  |  | 
| Building and Land Improvements | 36,875 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 18,232 |  |  |  | 
| Building and Land Improvements | 36,875 |  |  |  | 
| Total | 55,107 |  |  |  | 
| North Gate Business Park |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,755 |  |  |  | 
| Building and Land Improvements | 5 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,755 |  |  |  | 
| Building and Land Improvements | 5 |  |  |  | 
| Total | 1,760 |  |  |  | 
| NoVA Office A |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 2,096 |  |  |  | 
| Building and Land Improvements | 46,849 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 2,096 |  |  |  | 
| Building and Land Improvements | 46,849 |  |  |  | 
| Total | 48,945 |  |  |  | 
| Accumulated Depreciation | (8,096) |  |  |  | 
| NoVA Office B |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 739 |  |  |  | 
| Building and Land Improvements | 38,376 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 739 |  |  |  | 
| Building and Land Improvements | 38,376 |  |  |  | 
| Total | 39,115 |  |  |  | 
| Accumulated Depreciation | (4,715) |  |  |  | 
| NoVA Office C |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 7,751 |  |  |  | 
| Building and Land Improvements | 78,907 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 7,751 |  |  |  | 
| Building and Land Improvements | 78,907 |  |  |  | 
| Total | 86,658 |  |  |  | 
| Accumulated Depreciation | (477) |  |  |  | 
| NoVA Office D |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 6,587 |  |  |  | 
| Building and Land Improvements | 40,559 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 6,587 |  |  |  | 
| Building and Land Improvements | 40,559 |  |  |  | 
| Total | 47,146 |  |  |  | 
| Accumulated Depreciation | (4,466) |  |  |  | 
| Oak Grove A |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 12,866 |  |  |  | 
| Building and Land Improvements | 34,814 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 12,866 |  |  |  | 
| Building and Land Improvements | 34,814 |  |  |  | 
| Total | 47,680 |  |  |  | 
| Accumulated Depreciation | (1,358) |  |  |  | 
| Oak Grove B |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 12,866 |  |  |  | 
| Building and Land Improvements | 41,083 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 12,866 |  |  |  | 
| Building and Land Improvements | 41,083 |  |  |  | 
| Total | 53,949 |  |  |  | 
| Accumulated Depreciation | (1,832) |  |  |  | 
| Oak Grove C |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 9,491 |  |  |  | 
| Building and Land Improvements | 64,671 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 9,491 |  |  |  | 
| Building and Land Improvements | 64,671 |  |  |  | 
| Total | 74,162 |  |  |  | 
| Accumulated Depreciation | 0 |  |  |  | 
| Oak Grove Phase II |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 13,992 |  |  |  | 
| Building and Land Improvements | 13,820 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 13,992 |  |  |  | 
| Building and Land Improvements | 13,820 |  |  |  | 
| Total | 27,812 |  |  |  | 
| Old Annapolis Road |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,637 |  |  |  | 
| Building and Land Improvements | 5,500 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 6,755 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,637 |  |  |  | 
| Building and Land Improvements | 12,255 |  |  |  | 
| Total | 13,892 |  |  |  | 
| Accumulated Depreciation | (5,362) |  |  |  | 
| P2 A |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 16,853 |  |  |  | 
| Building and Land Improvements | 40,132 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 16,853 |  |  |  | 
| Building and Land Improvements | 40,132 |  |  |  | 
| Total | 56,985 |  |  |  | 
| Accumulated Depreciation | (1,739) |  |  |  | 
| P2 B |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 22,839 |  |  |  | 
| Building and Land Improvements | 36,362 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 22,839 |  |  |  | 
| Building and Land Improvements | 36,362 |  |  |  | 
| Total | 59,201 |  |  |  | 
| Accumulated Depreciation | (1,194) |  |  |  | 
| P2 C |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 14,869 |  |  |  | 
| Building and Land Improvements | 31,482 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 14,869 |  |  |  | 
| Building and Land Improvements | 31,482 |  |  |  | 
| Total | 46,351 |  |  |  | 
| Accumulated Depreciation | (828) |  |  |  | 
| Patriot Ridge |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 18,517 |  |  |  | 
| Building and Land Improvements | 14,573 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 18,517 |  |  |  | 
| Building and Land Improvements | 14,573 |  |  |  | 
| Total | 33,090 |  |  |  | 
| Project EL |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 7,430 |  |  |  | 
| Building and Land Improvements | 45,226 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 7,430 |  |  |  | 
| Building and Land Improvements | 45,226 |  |  |  | 
| Total | 52,656 |  |  |  | 
| Accumulated Depreciation | (552) |  |  |  | 
| Project EX |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 13,010 |  |  |  | 
| Building and Land Improvements | 19,097 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 13,010 |  |  |  | 
| Building and Land Improvements | 19,097 |  |  |  | 
| Total | 32,107 |  |  |  | 
| Accumulated Depreciation | (1,174) |  |  |  | 
| PS A |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 4,078 |  |  |  | 
| Building and Land Improvements | 2,200 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 4,078 |  |  |  | 
| Building and Land Improvements | 2,200 |  |  |  | 
| Total | 6,278 |  |  |  | 
| PS B |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 3,468 |  |  |  | 
| Building and Land Improvements | 1,940 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 3,468 |  |  |  | 
| Building and Land Improvements | 1,940 |  |  |  | 
| Total | 5,408 |  |  |  | 
| Redstone Gateway |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 29,937 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 29,937 |  |  |  | 
| Total | 29,937 |  |  |  | 
| Sentry Gateway - T |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 14,020 |  |  |  | 
| Building and Land Improvements | 38,804 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 13 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 14,020 |  |  |  | 
| Building and Land Improvements | 38,817 |  |  |  | 
| Total | 52,837 |  |  |  | 
| Accumulated Depreciation | (14,443) |  |  |  | 
| Sentry Gateway - V |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 1,066 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 1,066 |  |  |  | 
| Total | 1,066 |  |  |  | 
| Accumulated Depreciation | (348) |  |  |  | 
| Sentry Gateway - W |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 1,884 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 71 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 1,955 |  |  |  | 
| Total | 1,955 |  |  |  | 
| Accumulated Depreciation | (599) |  |  |  | 
| Sentry Gateway - X |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,964 |  |  |  | 
| Building and Land Improvements | 21,178 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,964 |  |  |  | 
| Building and Land Improvements | 21,178 |  |  |  | 
| Total | 23,142 |  |  |  | 
| Accumulated Depreciation | (5,905) |  |  |  | 
| Sentry Gateway - Y |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,964 |  |  |  | 
| Building and Land Improvements | 21,298 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,964 |  |  |  | 
| Building and Land Improvements | 21,298 |  |  |  | 
| Total | 23,262 |  |  |  | 
| Accumulated Depreciation | (5,940) |  |  |  | 
| Sentry Gateway - Z |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 1,964 |  |  |  | 
| Building and Land Improvements | 30,573 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 1,964 |  |  |  | 
| Building and Land Improvements | 30,573 |  |  |  | 
| Total | 32,537 |  |  |  | 
| Accumulated Depreciation | (5,203) |  |  |  | 
| SP Manassas |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 8,156 |  |  |  | 
| Building and Land Improvements | 300 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 8,156 |  |  |  | 
| Building and Land Improvements | 300 |  |  |  | 
| Total | 8,456 |  |  |  | 
| Westfields - Park Center |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Land | 8,667 |  |  |  | 
| Building and Land Improvements | 3,155 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Land | 8,667 |  |  |  | 
| Building and Land Improvements | 3,155 |  |  |  | 
| Total | 11,822 |  |  |  | 
| Other Developments, including intercompany eliminations |  |  |  |  | 
| Initial Cost |  |  |  |  | 
| Building and Land Improvements | 506 |  |  |  | 
| Costs Capitalized Subsequent to Acquisition | 259 |  |  |  | 
| Gross Amounts Carried At Close of Period |  |  |  |  | 
| Building and Land Improvements | 765 |  |  |  | 
| Total | 765 |  |  |  | 
| Accumulated Depreciation | $ (115) |  |  |  |