Annual report pursuant to Section 13 and 15(d)

Schedule III - Real Estate and Accumulated Depreciation (Details)

v3.3.1.900
Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Real Estate and Accumulated Depreciation        
Encumbrances $ 316,887,000      
Initial Cost        
Land 709,953,000      
Building and Land Improvements 3,106,271,000      
Costs Capitalized Subsequent to Acquisition 342,392,000      
Gross Amounts Carried at Close of Period        
Land 709,953,000      
Building and Land Improvements 3,448,663,000      
Total 4,158,616,000 $ 4,014,336,000 $ 3,811,950,000 $ 3,859,960,000
Accumulated Depreciation (718,680,000) (703,083,000) (597,649,000) $ (568,176,000)
Additional information        
Debt excluded from encumbrances 2,077,752,000 1,914,036,000    
Net discounts and deferred financing costs 19,500,000      
Aggregate cost of assets for federal income tax purposes 3,500,000,000      
Impairment losses $ 23,289,000 1,416,000 $ 5,857,000  
Buildings improvements [Member] | Minimum [Member]        
Additional information        
Estimated lives over which depreciation is recognized 10 years      
Buildings improvements [Member] | Maximum [Member]        
Additional information        
Estimated lives over which depreciation is recognized 40 years      
Revolving Credit Facility [Member]        
Additional information        
Debt excluded from encumbrances $ 43,500,000 83,000,000    
Term Loan Facilities [Member]        
Additional information        
Debt excluded from encumbrances 515,900,000 517,846,000    
Unsecured Senior Notes [Member]        
Additional information        
Debt excluded from encumbrances 1,200,000,000      
4.25% Exchangeable Senior Notes [Member]        
Additional information        
Debt excluded from encumbrances 0 572,000    
Unsecured notes payable [Member]        
Additional information        
Debt excluded from encumbrances 1,500,000 1,607,000    
Letter of Credit [Member]        
Additional information        
Debt excluded from encumbrances 14,800,000      
Fixed rate mortgage loans [Member]        
Additional information        
Debt excluded from encumbrances 281,208,000 385,769,000    
Net discounts and deferred financing costs 668,000      
100 Light Street [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 50,732,000      
Initial Cost        
Land 26,715,000      
Building and Land Improvements 58,343,000      
Costs Capitalized Subsequent to Acquisition 55,000      
Gross Amounts Carried at Close of Period        
Land 26,715,000      
Building and Land Improvements 58,398,000      
Total 85,113,000      
Accumulated Depreciation (1,588,000)      
1000 Redstone Gateway [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 11,370,000      
Initial Cost        
Building and Land Improvements 20,533,000      
Gross Amounts Carried at Close of Period        
Building and Land Improvements 20,533,000      
Total 20,533,000      
Accumulated Depreciation (1,438,000)      
1100 Redstone Gateway [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 11,791,000      
Initial Cost        
Building and Land Improvements 19,593,000      
Gross Amounts Carried at Close of Period        
Building and Land Improvements 19,593,000      
Total 19,593,000      
Accumulated Depreciation (965,000)      
114 National Business Parkway [Member]        
Initial Cost        
Land 364,000      
Building and Land Improvements 3,109,000      
Costs Capitalized Subsequent to Acquisition 60,000      
Gross Amounts Carried at Close of Period        
Land 364,000      
Building and Land Improvements 3,169,000      
Total 3,533,000      
Accumulated Depreciation (1,125,000)      
11751 Meadowville Lane [Member]        
Initial Cost        
Land 1,305,000      
Building and Land Improvements 52,098,000      
Costs Capitalized Subsequent to Acquisition 112,000      
Gross Amounts Carried at Close of Period        
Land 1,305,000      
Building and Land Improvements 52,210,000      
Total 53,515,000      
Accumulated Depreciation (11,194,000)      
1200 Redstone Gateway [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 13,639,000      
Initial Cost        
Building and Land Improvements 22,389,000      
Gross Amounts Carried at Close of Period        
Building and Land Improvements 22,389,000      
Total 22,389,000      
Accumulated Depreciation (1,145,000)      
1201 M Street [Member]        
Initial Cost        
Building and Land Improvements 49,785,000      
Costs Capitalized Subsequent to Acquisition 4,225,000      
Gross Amounts Carried at Close of Period        
Building and Land Improvements 54,010,000      
Total 54,010,000      
Accumulated Depreciation (8,947,000)      
1201 Winterson Road [Member]        
Initial Cost        
Land 1,288,000      
Building and Land Improvements 12,175,000      
Costs Capitalized Subsequent to Acquisition 460,000      
Gross Amounts Carried at Close of Period        
Land 1,288,000      
Building and Land Improvements 12,635,000      
Total 13,923,000      
Accumulated Depreciation (3,824,000)      
1220 12th Street, SE [Member]        
Initial Cost        
Building and Land Improvements 42,464,000      
Costs Capitalized Subsequent to Acquisition 2,431,000      
Gross Amounts Carried at Close of Period        
Building and Land Improvements 44,895,000      
Total 44,895,000      
Accumulated Depreciation (8,523,000)      
1243 Winterson Road [Member]        
Initial Cost        
Land 630,000      
Gross Amounts Carried at Close of Period        
Land 630,000      
Total 630,000      
1302 Concourse Drive [Member]        
Initial Cost        
Land 2,078,000      
Building and Land Improvements 8,313,000      
Costs Capitalized Subsequent to Acquisition 6,559,000      
Gross Amounts Carried at Close of Period        
Land 2,078,000      
Building and Land Improvements 14,872,000      
Total 16,950,000      
Accumulated Depreciation (6,188,000)      
1304 Concourse Drive [Member]        
Initial Cost        
Land 1,999,000      
Building and Land Improvements 12,934,000      
Costs Capitalized Subsequent to Acquisition 2,884,000      
Gross Amounts Carried at Close of Period        
Land 1,999,000      
Building and Land Improvements 15,818,000      
Total 17,817,000      
Accumulated Depreciation (6,360,000)      
1306 Concourse Drive [Member]        
Initial Cost        
Land 2,796,000      
Building and Land Improvements 11,186,000      
Costs Capitalized Subsequent to Acquisition 8,152,000      
Gross Amounts Carried at Close of Period        
Land 2,796,000      
Building and Land Improvements 19,338,000      
Total 22,134,000      
Accumulated Depreciation (6,922,000)      
131 National Business Parkway [Member]        
Initial Cost        
Land 1,906,000      
Building and Land Improvements 7,623,000      
Costs Capitalized Subsequent to Acquisition 3,524,000      
Gross Amounts Carried at Close of Period        
Land 1,906,000      
Building and Land Improvements 11,147,000      
Total 13,053,000      
Accumulated Depreciation (5,596,000)      
132 National Business Parkway [Member]        
Initial Cost        
Land 2,917,000      
Building and Land Improvements 12,259,000      
Costs Capitalized Subsequent to Acquisition 3,005,000      
Gross Amounts Carried at Close of Period        
Land 2,917,000      
Building and Land Improvements 15,264,000      
Total 18,181,000      
Accumulated Depreciation (7,700,000)      
133 National Business Parkway [Member]        
Initial Cost        
Land 2,517,000      
Building and Land Improvements 10,068,000      
Costs Capitalized Subsequent to Acquisition 5,204,000      
Gross Amounts Carried at Close of Period        
Land 2,517,000      
Building and Land Improvements 15,272,000      
Total 17,789,000      
Accumulated Depreciation (8,230,000)      
1331 Ashton Road [Member]        
Initial Cost        
Land 587,000      
Building and Land Improvements 2,347,000      
Costs Capitalized Subsequent to Acquisition 1,575,000      
Gross Amounts Carried at Close of Period        
Land 587,000      
Building and Land Improvements 3,922,000      
Total 4,509,000      
Accumulated Depreciation (1,337,000)      
1334 Ashton Road [Member]        
Initial Cost        
Land 736,000      
Building and Land Improvements 1,488,000      
Costs Capitalized Subsequent to Acquisition 2,639,000      
Gross Amounts Carried at Close of Period        
Land 736,000      
Building and Land Improvements 4,127,000      
Total 4,863,000      
Accumulated Depreciation (2,467,000)      
134 National Business Parkway [Member]        
Initial Cost        
Land 3,684,000      
Building and Land Improvements 7,517,000      
Costs Capitalized Subsequent to Acquisition 3,496,000      
Gross Amounts Carried at Close of Period        
Land 3,684,000      
Building and Land Improvements 11,013,000      
Total 14,697,000      
Accumulated Depreciation (4,062,000)      
1340 Ashton Road [Member]        
Initial Cost        
Land 905,000      
Building and Land Improvements 3,620,000      
Costs Capitalized Subsequent to Acquisition 1,469,000      
Gross Amounts Carried at Close of Period        
Land 905,000      
Building and Land Improvements 5,089,000      
Total 5,994,000      
Accumulated Depreciation (2,621,000)      
1341 Ashton Road [Member]        
Initial Cost        
Land 306,000      
Building and Land Improvements 1,223,000      
Costs Capitalized Subsequent to Acquisition 604,000      
Gross Amounts Carried at Close of Period        
Land 306,000      
Building and Land Improvements 1,827,000      
Total 2,133,000      
Accumulated Depreciation (932,000)      
1343 Ashton Road [Member]        
Initial Cost        
Land 193,000      
Building and Land Improvements 774,000      
Costs Capitalized Subsequent to Acquisition 405,000      
Gross Amounts Carried at Close of Period        
Land 193,000      
Building and Land Improvements 1,179,000      
Total 1,372,000      
Accumulated Depreciation (640,000)      
13450 Sunrise Valley Road [Member]        
Initial Cost        
Land 1,386,000      
Building and Land Improvements 5,576,000      
Costs Capitalized Subsequent to Acquisition 3,335,000      
Gross Amounts Carried at Close of Period        
Land 1,386,000      
Building and Land Improvements 8,911,000      
Total 10,297,000      
Accumulated Depreciation (3,902,000)      
13454 Sunrise Valley Road [Member]        
Initial Cost        
Land 2,899,000      
Building and Land Improvements 11,986,000      
Costs Capitalized Subsequent to Acquisition 6,750,000      
Gross Amounts Carried at Close of Period        
Land 2,899,000      
Building and Land Improvements 18,736,000      
Total 21,635,000      
Accumulated Depreciation (7,177,000)      
135 National Business Parkway [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 11,125,000      
Initial Cost        
Land 2,484,000      
Building and Land Improvements 9,750,000      
Costs Capitalized Subsequent to Acquisition 5,700,000      
Gross Amounts Carried at Close of Period        
Land 2,484,000      
Building and Land Improvements 15,450,000      
Total 17,934,000      
Accumulated Depreciation (6,467,000)      
1362 Mellon Road [Member]        
Initial Cost        
Land 1,706,000      
Building and Land Improvements 8,670,000      
Costs Capitalized Subsequent to Acquisition 182,000      
Gross Amounts Carried at Close of Period        
Land 1,706,000      
Building and Land Improvements 8,852,000      
Total 10,558,000      
Accumulated Depreciation (1,517,000)      
13857 McLearen Road [Member]        
Initial Cost        
Land 3,507,000      
Building and Land Improvements 30,177,000      
Costs Capitalized Subsequent to Acquisition 1,565,000      
Gross Amounts Carried at Close of Period        
Land 3,507,000      
Building and Land Improvements 31,742,000      
Total 35,249,000      
Accumulated Depreciation (6,961,000)      
140 National Business Parkway [Member]        
Initial Cost        
Land 3,407,000      
Building and Land Improvements 24,167,000      
Costs Capitalized Subsequent to Acquisition 688,000      
Gross Amounts Carried at Close of Period        
Land 3,407,000      
Building and Land Improvements 24,855,000      
Total 28,262,000      
Accumulated Depreciation (7,647,000)      
141 National Business Parkway [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 11,566,000      
Initial Cost        
Land 2,398,000      
Building and Land Improvements 9,590,000      
Costs Capitalized Subsequent to Acquisition 3,194,000      
Gross Amounts Carried at Close of Period        
Land 2,398,000      
Building and Land Improvements 12,784,000      
Total 15,182,000      
Accumulated Depreciation (5,963,000)      
14280 Park Meadow Drive [Member]        
Initial Cost        
Land 3,731,000      
Building and Land Improvements 15,953,000      
Costs Capitalized Subsequent to Acquisition 1,764,000      
Gross Amounts Carried at Close of Period        
Land 3,731,000      
Building and Land Improvements 17,717,000      
Total 21,448,000      
Accumulated Depreciation (6,185,000)      
1460 Dorsey Road [Member]        
Initial Cost        
Land 1,800,000      
Gross Amounts Carried at Close of Period        
Land 1,800,000      
Total 1,800,000      
14840 Conference Center Drive [Member]        
Initial Cost        
Land 1,572,000      
Building and Land Improvements 8,175,000      
Costs Capitalized Subsequent to Acquisition 2,860,000      
Gross Amounts Carried at Close of Period        
Land 1,572,000      
Building and Land Improvements 11,035,000      
Total 12,607,000      
Accumulated Depreciation (4,320,000)      
14850 Conference Center Drive [Member]        
Initial Cost        
Land 1,615,000      
Building and Land Improvements 8,358,000      
Costs Capitalized Subsequent to Acquisition 2,947,000      
Gross Amounts Carried at Close of Period        
Land 1,615,000      
Building and Land Improvements 11,305,000      
Total 12,920,000      
Accumulated Depreciation (4,646,000)      
14900 Conference Center Drive [Member]        
Initial Cost        
Land 3,436,000      
Building and Land Improvements 14,402,000      
Costs Capitalized Subsequent to Acquisition 5,239,000      
Gross Amounts Carried at Close of Period        
Land 3,436,000      
Building and Land Improvements 19,641,000      
Total 23,077,000      
Accumulated Depreciation (8,221,000)      
1501 South Clinton Street [Member]        
Initial Cost        
Land 27,964,000      
Building and Land Improvements 52,146,000      
Costs Capitalized Subsequent to Acquisition 8,165,000      
Gross Amounts Carried at Close of Period        
Land 27,964,000      
Building and Land Improvements 60,311,000      
Total 88,275,000      
Accumulated Depreciation (14,472,000)      
15049 Conference Center Drive [Member]        
Initial Cost        
Land 4,415,000      
Building and Land Improvements 20,365,000      
Costs Capitalized Subsequent to Acquisition 3,619,000      
Gross Amounts Carried at Close of Period        
Land 4,415,000      
Building and Land Improvements 23,984,000      
Total 28,399,000      
Accumulated Depreciation (9,236,000)      
15059 Conference Center Drive [Member]        
Initial Cost        
Land 5,753,000      
Building and Land Improvements 13,615,000      
Costs Capitalized Subsequent to Acquisition 2,065,000      
Gross Amounts Carried at Close of Period        
Land 5,753,000      
Building and Land Improvements 15,680,000      
Total 21,433,000      
Accumulated Depreciation (6,697,000)      
15395 John Marshall Highway [Member]        
Initial Cost        
Land 2,465,000      
Building and Land Improvements 24,768,000      
Gross Amounts Carried at Close of Period        
Land 2,465,000      
Building and Land Improvements 24,768,000      
Total 27,233,000      
Accumulated Depreciation (1,195,000)      
1550 West Nursery Road [Member]        
Initial Cost        
Land 14,071,000      
Building and Land Improvements 16,930,000      
Gross Amounts Carried at Close of Period        
Land 14,071,000      
Building and Land Improvements 16,930,000      
Total 31,001,000      
Accumulated Depreciation (3,626,000)      
1560 West Nursery Road [Member]        
Initial Cost        
Land 1,441,000      
Building and Land Improvements 113,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amounts Carried at Close of Period        
Land 1,441,000      
Building and Land Improvements 113,000      
Total 1,554,000      
Accumulated Depreciation (5,000)      
1560A Cable Ranch Road [Member]        
Initial Cost        
Land 1,097,000      
Building and Land Improvements 3,770,000      
Costs Capitalized Subsequent to Acquisition 394,000      
Gross Amounts Carried at Close of Period        
Land 1,097,000      
Building and Land Improvements 4,164,000      
Total 5,261,000      
Accumulated Depreciation (1,298,000)      
1560B Cable Ranch Road [Member]        
Initial Cost        
Land 2,299,000      
Building and Land Improvements 6,545,000      
Costs Capitalized Subsequent to Acquisition 159,000      
Gross Amounts Carried at Close of Period        
Land 2,299,000      
Building and Land Improvements 6,704,000      
Total 9,003,000      
Accumulated Depreciation (1,738,000)      
16442 Commerce Drive [Member]        
Initial Cost        
Land 613,000      
Building and Land Improvements 2,582,000      
Costs Capitalized Subsequent to Acquisition 883,000      
Gross Amounts Carried at Close of Period        
Land 613,000      
Building and Land Improvements 3,465,000      
Total 4,078,000      
Accumulated Depreciation (1,332,000)      
16480 Commerce Drive [Member]        
Initial Cost        
Land 1,856,000      
Building and Land Improvements 7,425,000      
Costs Capitalized Subsequent to Acquisition 1,283,000      
Gross Amounts Carried at Close of Period        
Land 1,856,000      
Building and Land Improvements 8,708,000      
Total 10,564,000      
Accumulated Depreciation (2,316,000)      
16501 Commerce Drive [Member]        
Initial Cost        
Land 522,000      
Building and Land Improvements 2,090,000      
Costs Capitalized Subsequent to Acquisition 482,000      
Gross Amounts Carried at Close of Period        
Land 522,000      
Building and Land Improvements 2,572,000      
Total 3,094,000      
Accumulated Depreciation (797,000)      
16539 Commerce Drive [Member]        
Initial Cost        
Land 688,000      
Building and Land Improvements 2,860,000      
Costs Capitalized Subsequent to Acquisition 1,524,000      
Gross Amounts Carried at Close of Period        
Land 688,000      
Building and Land Improvements 4,384,000      
Total 5,072,000      
Accumulated Depreciation (1,934,000)      
16541 Commerce Drive [Member]        
Initial Cost        
Land 773,000      
Building and Land Improvements 3,094,000      
Costs Capitalized Subsequent to Acquisition 1,368,000      
Gross Amounts Carried at Close of Period        
Land 773,000      
Building and Land Improvements 4,462,000      
Total 5,235,000      
Accumulated Depreciation (1,727,000)      
16543 Commerce Drive [Member]        
Initial Cost        
Land 436,000      
Building and Land Improvements 1,742,000      
Costs Capitalized Subsequent to Acquisition 502,000      
Gross Amounts Carried at Close of Period        
Land 436,000      
Building and Land Improvements 2,244,000      
Total 2,680,000      
Accumulated Depreciation (573,000)      
1751 Pinnacle Drive [Member]        
Initial Cost        
Land 10,486,000      
Building and Land Improvements 42,339,000      
Costs Capitalized Subsequent to Acquisition 24,059,000      
Gross Amounts Carried at Close of Period        
Land 10,486,000      
Building and Land Improvements 66,398,000      
Total 76,884,000      
Accumulated Depreciation (23,750,000)      
1753 Pinnacle Drive [Member]        
Initial Cost        
Land 8,275,000      
Building and Land Improvements 34,353,000      
Costs Capitalized Subsequent to Acquisition 10,894,000      
Gross Amounts Carried at Close of Period        
Land 8,275,000      
Building and Land Improvements 45,247,000      
Total 53,522,000      
Accumulated Depreciation (15,849,000)      
201 Technology Drive [Member]        
Initial Cost        
Land 726,000      
Building and Land Improvements 31,091,000      
Costs Capitalized Subsequent to Acquisition 59,000      
Gross Amounts Carried at Close of Period        
Land 726,000      
Building and Land Improvements 31,150,000      
Total 31,876,000      
Accumulated Depreciation (6,358,000)      
206 Research Boulevard [Member]        
Initial Cost        
Land 1,813,000      
Building and Land Improvements 17,485,000      
Gross Amounts Carried at Close of Period        
Land 1,813,000      
Building and Land Improvements 17,485,000      
Total 19,298,000      
Accumulated Depreciation (1,416,000)      
209 Research Boulevard [Member]        
Initial Cost        
Land 1,045,000      
Building and Land Improvements 16,087,000      
Costs Capitalized Subsequent to Acquisition 79,000      
Gross Amounts Carried at Close of Period        
Land 1,045,000      
Building and Land Improvements 16,166,000      
Total 17,211,000      
Accumulated Depreciation (2,069,000)      
210 Research Boulevard [Member]        
Initial Cost        
Land 1,065,000      
Building and Land Improvements 15,102,000      
Costs Capitalized Subsequent to Acquisition 75,000      
Gross Amounts Carried at Close of Period        
Land 1,065,000      
Building and Land Improvements 15,177,000      
Total 16,242,000      
Accumulated Depreciation (1,569,000)      
2100 Rideout Road [Member]        
Initial Cost        
Land 0      
Building and Land Improvements 2,586,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amounts Carried at Close of Period        
Land 0      
Building and Land Improvements 2,586,000      
Total 2,586,000      
2100 L Street [Member]        
Initial Cost        
Land 1,273,000      
Building and Land Improvements 1,685,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amounts Carried at Close of Period        
Land 1,273,000      
Building and Land Improvements 1,685,000      
Total 2,958,000      
21267 Smith Switch Road [Member]        
Initial Cost        
Land 4,040,000      
Building and Land Improvements 10,135,000      
Gross Amounts Carried at Close of Period        
Land 4,040,000      
Building and Land Improvements 10,135,000      
Total 14,175,000      
Accumulated Depreciation (365,000)      
21271 Smith Switch Road [Member]        
Initial Cost        
Land 7,346,000      
Building and Land Improvements 18,267,000      
Gross Amounts Carried at Close of Period        
Land 7,346,000      
Building and Land Improvements 18,267,000      
Total 25,613,000      
Accumulated Depreciation (881,000)      
22289 Exploration Drive [Member]        
Initial Cost        
Land 1,422,000      
Building and Land Improvements 5,719,000      
Costs Capitalized Subsequent to Acquisition 1,660,000      
Gross Amounts Carried at Close of Period        
Land 1,422,000      
Building and Land Improvements 7,379,000      
Total 8,801,000      
Accumulated Depreciation (2,826,000)      
22299 Exploration Drive [Member]        
Initial Cost        
Land 1,362,000      
Building and Land Improvements 5,791,000      
Costs Capitalized Subsequent to Acquisition 1,218,000      
Gross Amounts Carried at Close of Period        
Land 1,362,000      
Building and Land Improvements 7,009,000      
Total 8,371,000      
Accumulated Depreciation (2,641,000)      
22300 Exploration Drive [Member]        
Initial Cost        
Land 1,094,000      
Building and Land Improvements 5,038,000      
Costs Capitalized Subsequent to Acquisition 1,315,000      
Gross Amounts Carried at Close of Period        
Land 1,094,000      
Building and Land Improvements 6,353,000      
Total 7,447,000      
Accumulated Depreciation (2,024,000)      
22309 Exploration Drive [Member]        
Initial Cost        
Land 2,243,000      
Building and Land Improvements 10,419,000      
Costs Capitalized Subsequent to Acquisition 7,787,000      
Gross Amounts Carried at Close of Period        
Land 2,243,000      
Building and Land Improvements 18,206,000      
Total 20,449,000      
Accumulated Depreciation (4,683,000)      
23535 Cottonwood Parkway [Member]        
Initial Cost        
Land 692,000      
Building and Land Improvements 3,051,000      
Costs Capitalized Subsequent to Acquisition 248,000      
Gross Amounts Carried at Close of Period        
Land 692,000      
Building and Land Improvements 3,299,000      
Total 3,991,000      
Accumulated Depreciation (1,206,000)      
250 W Pratt St [Member]        
Initial Cost        
Land 8,057,000      
Building and Land Improvements 34,654,000      
Costs Capitalized Subsequent to Acquisition 4,765,000      
Gross Amounts Carried at Close of Period        
Land 8,057,000      
Building and Land Improvements 39,419,000      
Total 47,476,000      
Accumulated Depreciation (1,652,000)      
2500 Riva Road [Member]        
Initial Cost        
Land 2,791,000      
Building and Land Improvements 12,145,000      
Costs Capitalized Subsequent to Acquisition 1,000      
Gross Amounts Carried at Close of Period        
Land 2,791,000      
Building and Land Improvements 12,146,000      
Total 14,937,000      
Accumulated Depreciation (4,417,000)      
2600 Park Tower Drive [Member]        
Initial Cost        
Land 20,304,000      
Building and Land Improvements 34,443,000      
Costs Capitalized Subsequent to Acquisition 346,000      
Gross Amounts Carried at Close of Period        
Land 20,304,000      
Building and Land Improvements 34,789,000      
Total 55,093,000      
Accumulated Depreciation (1,051,000)      
2691 Technology Drive [Member]        
Initial Cost        
Land 2,098,000      
Building and Land Improvements 17,334,000      
Costs Capitalized Subsequent to Acquisition 5,305,000      
Gross Amounts Carried at Close of Period        
Land 2,098,000      
Building and Land Improvements 22,639,000      
Total 24,737,000      
Accumulated Depreciation (7,827,000)      
2701 Technology Drive [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 22,053,000      
Initial Cost        
Land 1,737,000      
Building and Land Improvements 15,266,000      
Costs Capitalized Subsequent to Acquisition 2,821,000      
Gross Amounts Carried at Close of Period        
Land 1,737,000      
Building and Land Improvements 18,087,000      
Total 19,824,000      
Accumulated Depreciation (7,567,000)      
2711 Technology Drive [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 17,153,000      
Initial Cost        
Land 2,251,000      
Building and Land Improvements 21,611,000      
Costs Capitalized Subsequent to Acquisition 1,468,000      
Gross Amounts Carried at Close of Period        
Land 2,251,000      
Building and Land Improvements 23,079,000      
Total 25,330,000      
Accumulated Depreciation (10,158,000)      
2720 Technology Drive [Member]        
Initial Cost        
Land 3,863,000      
Building and Land Improvements 29,272,000      
Costs Capitalized Subsequent to Acquisition 146,000      
Gross Amounts Carried at Close of Period        
Land 3,863,000      
Building and Land Improvements 29,418,000      
Total 33,281,000      
Accumulated Depreciation (8,316,000)      
2721 Technology Drive [Member]        
Initial Cost        
Land 4,611,000      
Building and Land Improvements 14,597,000      
Costs Capitalized Subsequent to Acquisition 1,263,000      
Gross Amounts Carried at Close of Period        
Land 4,611,000      
Building and Land Improvements 15,860,000      
Total 20,471,000      
Accumulated Depreciation (6,400,000)      
2730 Hercules Road [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 34,256,000      
Initial Cost        
Land 8,737,000      
Building and Land Improvements 31,612,000      
Costs Capitalized Subsequent to Acquisition 7,213,000      
Gross Amounts Carried at Close of Period        
Land 8,737,000      
Building and Land Improvements 38,825,000      
Total 47,562,000      
Accumulated Depreciation (15,674,000)      
2900 Towerview Road [Member]        
Initial Cost        
Land 3,207,000      
Building and Land Improvements 16,379,000      
Costs Capitalized Subsequent to Acquisition 6,509,000      
Gross Amounts Carried at Close of Period        
Land 3,207,000      
Building and Land Improvements 22,888,000      
Total 26,095,000      
Accumulated Depreciation (7,181,000)      
30 Light Street [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 4,268,000      
Initial Cost        
Land 0      
Building and Land Improvements 12,101,000      
Costs Capitalized Subsequent to Acquisition 37,000      
Gross Amounts Carried at Close of Period        
Land 0      
Building and Land Improvements 12,138,000      
Total 12,138,000      
Accumulated Depreciation (128,000)      
300 Sentinel Drive [Member]        
Initial Cost        
Land 1,517,000      
Building and Land Improvements 59,016,000      
Costs Capitalized Subsequent to Acquisition 219,000      
Gross Amounts Carried at Close of Period        
Land 1,517,000      
Building and Land Improvements 59,235,000      
Total 60,752,000      
Accumulated Depreciation (8,458,000)      
302 Sentinel Drive [Member]        
Initial Cost        
Land 2,648,000      
Building and Land Improvements 29,687,000      
Costs Capitalized Subsequent to Acquisition 445,000      
Gross Amounts Carried at Close of Period        
Land 2,648,000      
Building and Land Improvements 30,132,000      
Total 32,780,000      
Accumulated Depreciation (6,000,000)      
304 Sentinel Drive [Member]        
Initial Cost        
Land 3,411,000      
Building and Land Improvements 24,917,000      
Costs Capitalized Subsequent to Acquisition 193,000      
Gross Amounts Carried at Close of Period        
Land 3,411,000      
Building and Land Improvements 25,110,000      
Total 28,521,000      
Accumulated Depreciation (6,304,000)      
306 Sentinel Drive [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 15,878,000      
Initial Cost        
Land 3,260,000      
Building and Land Improvements 22,592,000      
Costs Capitalized Subsequent to Acquisition 611,000      
Gross Amounts Carried at Close of Period        
Land 3,260,000      
Building and Land Improvements 23,203,000      
Total 26,463,000      
Accumulated Depreciation (5,269,000)      
308 Sentinel Drive [Member]        
Initial Cost        
Land 1,422,000      
Building and Land Improvements 26,208,000      
Costs Capitalized Subsequent to Acquisition 37,000      
Gross Amounts Carried at Close of Period        
Land 1,422,000      
Building and Land Improvements 26,245,000      
Total 27,667,000      
Accumulated Depreciation (3,050,000)      
310 Sentinel Way [Member]        
Initial Cost        
Land 2,372,000      
Building and Land Improvements 36,468,000      
Gross Amounts Carried at Close of Period        
Land 2,372,000      
Building and Land Improvements 36,468,000      
Total 38,840,000      
Accumulated Depreciation (191,000)      
310 The Bridge Street [Member]        
Initial Cost        
Land 261,000      
Building and Land Improvements 26,531,000      
Costs Capitalized Subsequent to Acquisition 1,695,000      
Gross Amounts Carried at Close of Period        
Land 261,000      
Building and Land Improvements 28,226,000      
Total 28,487,000      
Accumulated Depreciation (5,136,000)      
312 Sentinel Way [Member]        
Initial Cost        
Land 3,138,000      
Building and Land Improvements 27,789,000      
Gross Amounts Carried at Close of Period        
Land 3,138,000      
Building and Land Improvements 27,789,000      
Total 30,927,000      
Accumulated Depreciation (913,000)      
3120 Fairview Park Drive [Member]        
Initial Cost        
Land 6,863,000      
Building and Land Improvements 35,606,000      
Costs Capitalized Subsequent to Acquisition 8,773,000      
Gross Amounts Carried at Close of Period        
Land 6,863,000      
Building and Land Improvements 44,379,000      
Total 51,242,000      
Accumulated Depreciation (7,229,000)      
314 Sentinel Way [Member]        
Initial Cost        
Land 1,254,000      
Building and Land Improvements 1,439,000      
Gross Amounts Carried at Close of Period        
Land 1,254,000      
Building and Land Improvements 1,439,000      
Total 2,693,000      
Accumulated Depreciation (249,000)      
316 Sentinel Way [Member]        
Initial Cost        
Land 2,748,000      
Building and Land Improvements 38,156,000      
Costs Capitalized Subsequent to Acquisition 138,000      
Gross Amounts Carried at Close of Period        
Land 2,748,000      
Building and Land Improvements 38,294,000      
Total 41,042,000      
Accumulated Depreciation (3,570,000)      
318 Sentinel Way [Member]        
Initial Cost        
Land 2,185,000      
Building and Land Improvements 28,426,000      
Gross Amounts Carried at Close of Period        
Land 2,185,000      
Building and Land Improvements 28,426,000      
Total 30,611,000      
Accumulated Depreciation (6,981,000)      
320 Sentinel Way [Member]        
Initial Cost        
Land 2,067,000      
Building and Land Improvements 21,623,000      
Gross Amounts Carried at Close of Period        
Land 2,067,000      
Building and Land Improvements 21,623,000      
Total 23,690,000      
Accumulated Depreciation (4,310,000)      
322 Sentinel Way [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 21,122,000      
Initial Cost        
Land 2,605,000      
Building and Land Improvements 22,827,000      
Gross Amounts Carried at Close of Period        
Land 2,605,000      
Building and Land Improvements 22,827,000      
Total 25,432,000      
Accumulated Depreciation (5,143,000)      
324 Sentinel Way [Member]        
Initial Cost        
Land 1,656,000      
Building and Land Improvements 23,018,000      
Gross Amounts Carried at Close of Period        
Land 1,656,000      
Building and Land Improvements 23,018,000      
Total 24,674,000      
Accumulated Depreciation (3,078,000)      
410 National Business Parkway [Member]        
Initial Cost        
Land 1,831,000      
Building and Land Improvements 23,257,000      
Costs Capitalized Subsequent to Acquisition 112,000      
Gross Amounts Carried at Close of Period        
Land 1,831,000      
Building and Land Improvements 23,369,000      
Total 25,200,000      
Accumulated Depreciation (1,719,000)      
420 National Business Parkway [Member]        
Initial Cost        
Land 2,370,000      
Building and Land Improvements 27,490,000      
Costs Capitalized Subsequent to Acquisition 106,000      
Gross Amounts Carried at Close of Period        
Land 2,370,000      
Building and Land Improvements 27,596,000      
Total 29,966,000      
Accumulated Depreciation (1,230,000)      
430 National Business Parkway [Member]        
Initial Cost        
Land 1,852,000      
Building and Land Improvements 21,153,000      
Costs Capitalized Subsequent to Acquisition 119,000      
Gross Amounts Carried at Close of Period        
Land 1,852,000      
Building and Land Improvements 21,272,000      
Total 23,124,000      
Accumulated Depreciation (2,034,000)      
44408 Pecan Court [Member]        
Initial Cost        
Land 817,000      
Building and Land Improvements 1,583,000      
Costs Capitalized Subsequent to Acquisition 581,000      
Gross Amounts Carried at Close of Period        
Land 817,000      
Building and Land Improvements 2,164,000      
Total 2,981,000      
Accumulated Depreciation (560,000)      
44414 Pecan Court [Member]        
Initial Cost        
Land 405,000      
Building and Land Improvements 1,619,000      
Costs Capitalized Subsequent to Acquisition 337,000      
Gross Amounts Carried at Close of Period        
Land 405,000      
Building and Land Improvements 1,956,000      
Total 2,361,000      
Accumulated Depreciation (725,000)      
44417 Pecan Court [Member]        
Initial Cost        
Land 434,000      
Building and Land Improvements 3,348,000      
Costs Capitalized Subsequent to Acquisition 88,000      
Gross Amounts Carried at Close of Period        
Land 434,000      
Building and Land Improvements 3,436,000      
Total 3,870,000      
Accumulated Depreciation (1,127,000)      
44420 Pecan Court [Member]        
Initial Cost        
Land 344,000      
Building and Land Improvements 890,000      
Costs Capitalized Subsequent to Acquisition 148,000      
Gross Amounts Carried at Close of Period        
Land 344,000      
Building and Land Improvements 1,038,000      
Total 1,382,000      
Accumulated Depreciation (255,000)      
44425 Pecan Court [Member]        
Initial Cost        
Land 1,309,000      
Building and Land Improvements 3,506,000      
Costs Capitalized Subsequent to Acquisition 1,590,000      
Gross Amounts Carried at Close of Period        
Land 1,309,000      
Building and Land Improvements 5,096,000      
Total 6,405,000      
Accumulated Depreciation (1,784,000)      
45310 Abell House Lane [Member]        
Initial Cost        
Land 2,272,000      
Building and Land Improvements 13,808,000      
Gross Amounts Carried at Close of Period        
Land 2,272,000      
Building and Land Improvements 13,808,000      
Total 16,080,000      
Accumulated Depreciation (1,403,000)      
46579 Expedition Drive [Member]        
Initial Cost        
Land 1,406,000      
Building and Land Improvements 5,796,000      
Costs Capitalized Subsequent to Acquisition 1,335,000      
Gross Amounts Carried at Close of Period        
Land 1,406,000      
Building and Land Improvements 7,131,000      
Total 8,537,000      
Accumulated Depreciation (3,060,000)      
46591 Expedition Drive [Member]        
Initial Cost        
Land 1,200,000      
Building and Land Improvements 7,199,000      
Costs Capitalized Subsequent to Acquisition 1,134,000      
Gross Amounts Carried at Close of Period        
Land 1,200,000      
Building and Land Improvements 8,333,000      
Total 9,533,000      
Accumulated Depreciation (1,933,000)      
4851 Stonecroft Boulevard [Member]        
Initial Cost        
Land 1,878,000      
Building and Land Improvements 11,558,000      
Costs Capitalized Subsequent to Acquisition 21,000      
Gross Amounts Carried at Close of Period        
Land 1,878,000      
Building and Land Improvements 11,579,000      
Total 13,457,000      
Accumulated Depreciation (3,248,000)      
4940 Campbell Drive [Member]        
Initial Cost        
Land 1,379,000      
Building and Land Improvements 2,728,000      
Costs Capitalized Subsequent to Acquisition 1,464,000      
Gross Amounts Carried at Close of Period        
Land 1,379,000      
Building and Land Improvements 4,192,000      
Total 5,571,000      
Accumulated Depreciation (445,000)      
525 Babcock Road [Member]        
Initial Cost        
Land 355,000      
Building and Land Improvements 397,000      
Costs Capitalized Subsequent to Acquisition 79,000      
Gross Amounts Carried at Close of Period        
Land 355,000      
Building and Land Improvements 476,000      
Total 831,000      
Accumulated Depreciation (173,000)      
5325 Nottingham Drive [Member]        
Initial Cost        
Land 816,000      
Building and Land Improvements 3,976,000      
Costs Capitalized Subsequent to Acquisition 485,000      
Gross Amounts Carried at Close of Period        
Land 816,000      
Building and Land Improvements 4,461,000      
Total 5,277,000      
Accumulated Depreciation (1,233,000)      
5355 Nottingham Drive [Member]        
Initial Cost        
Land 761,000      
Building and Land Improvements 3,562,000      
Costs Capitalized Subsequent to Acquisition 1,758,000      
Gross Amounts Carried at Close of Period        
Land 761,000      
Building and Land Improvements 5,320,000      
Total 6,081,000      
Accumulated Depreciation (2,132,000)      
540 National Business Parkway [Member]        
Initial Cost        
Land 2,035,000      
Building and Land Improvements 9,496,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amounts Carried at Close of Period        
Land 2,035,000      
Building and Land Improvements 9,496,000      
Total 11,531,000      
Accumulated Depreciation 0      
5520 Research Park Drive [Member]        
Initial Cost        
Building and Land Improvements 20,072,000      
Costs Capitalized Subsequent to Acquisition 201,000      
Gross Amounts Carried at Close of Period        
Building and Land Improvements 20,273,000      
Total 20,273,000      
Accumulated Depreciation (3,195,000)      
5522 Research Park Drive [Member]        
Initial Cost        
Building and Land Improvements 4,550,000      
Gross Amounts Carried at Close of Period        
Building and Land Improvements 4,550,000      
Total 4,550,000      
Accumulated Depreciation (955,000)      
5825 University Research Court [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 15,255,000      
Initial Cost        
Building and Land Improvements 22,740,000      
Costs Capitalized Subsequent to Acquisition 87,000      
Gross Amounts Carried at Close of Period        
Building and Land Improvements 22,827,000      
Total 22,827,000      
Accumulated Depreciation (3,817,000)      
5850 University Research Court [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 20,771,000      
Initial Cost        
Building and Land Improvements 31,906,000      
Costs Capitalized Subsequent to Acquisition 406,000      
Gross Amounts Carried at Close of Period        
Building and Land Improvements 32,312,000      
Total 32,312,000      
Accumulated Depreciation (4,580,000)      
6700 Alexander Bell Drive [Member]        
Initial Cost        
Land 1,755,000      
Building and Land Improvements 7,019,000      
Costs Capitalized Subsequent to Acquisition 6,226,000      
Gross Amounts Carried at Close of Period        
Land 1,755,000      
Building and Land Improvements 13,245,000      
Total 15,000,000      
Accumulated Depreciation (5,913,000)      
6708 Alexander Bell Drive [Member]        
Initial Cost        
Land 897,000      
Building and Land Improvements 8,844,000      
Costs Capitalized Subsequent to Acquisition 1,591,000      
Gross Amounts Carried at Close of Period        
Land 897,000      
Building and Land Improvements 10,435,000      
Total 11,332,000      
Accumulated Depreciation   (3,414,000)    
6711 Columbia Gateway Drive [Member]        
Initial Cost        
Land 2,683,000      
Building and Land Improvements 23,239,000      
Costs Capitalized Subsequent to Acquisition 619,000      
Gross Amounts Carried at Close of Period        
Land 2,683,000      
Building and Land Improvements 23,858,000      
Total 26,541,000      
Accumulated Depreciation   (5,407,000)    
6716 Alexander Bell Drive [Member]        
Initial Cost        
Land 1,242,000      
Building and Land Improvements 4,969,000      
Costs Capitalized Subsequent to Acquisition 3,352,000      
Gross Amounts Carried at Close of Period        
Land 1,242,000      
Building and Land Improvements 8,321,000      
Total 9,563,000      
Accumulated Depreciation   (4,359,000)    
6721 Columbia Gateway Drive [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 16,663,000      
Initial Cost        
Land 1,753,000      
Building and Land Improvements 34,090,000      
Costs Capitalized Subsequent to Acquisition 76,000      
Gross Amounts Carried at Close of Period        
Land 1,753,000      
Building and Land Improvements 34,166,000      
Total 35,919,000      
Accumulated Depreciation   (5,798,000)    
6724 Alexander Bell Drive [Member]        
Initial Cost        
Land 449,000      
Building and Land Improvements 5,039,000      
Costs Capitalized Subsequent to Acquisition 708,000      
Gross Amounts Carried at Close of Period        
Land 449,000      
Building and Land Improvements 5,747,000      
Total 6,196,000      
Accumulated Depreciation   (2,266,000)    
6731 Columbia Gateway Drive [Member]        
Initial Cost        
Land 2,807,000      
Building and Land Improvements 19,098,000      
Costs Capitalized Subsequent to Acquisition 2,916,000      
Gross Amounts Carried at Close of Period        
Land 2,807,000      
Building and Land Improvements 22,014,000      
Total 24,821,000      
Accumulated Depreciation   (8,494,000)    
6740 Alexander Bell Drive [Member]        
Initial Cost        
Land 1,424,000      
Building and Land Improvements 5,696,000      
Costs Capitalized Subsequent to Acquisition 3,340,000      
Gross Amounts Carried at Close of Period        
Land 1,424,000      
Building and Land Improvements 9,036,000      
Total 10,460,000      
Accumulated Depreciation   (5,058,000)    
6741 Columbia Gateway Drive [Member]        
Initial Cost        
Land 675,000      
Building and Land Improvements 1,711,000      
Costs Capitalized Subsequent to Acquisition 124,000      
Gross Amounts Carried at Close of Period        
Land 675,000      
Building and Land Improvements 1,835,000      
Total 2,510,000      
Accumulated Depreciation   (357,000)    
6750 Alexander Bell Drive [Member]        
Initial Cost        
Land 1,263,000      
Building and Land Improvements 12,461,000      
Costs Capitalized Subsequent to Acquisition 3,457,000      
Gross Amounts Carried at Close of Period        
Land 1,263,000      
Building and Land Improvements 15,918,000      
Total 17,181,000      
Accumulated Depreciation   (7,576,000)    
6760 Alexander Bell Drive [Member]        
Initial Cost        
Land 890,000      
Building and Land Improvements 3,561,000      
Costs Capitalized Subsequent to Acquisition 2,974,000      
Gross Amounts Carried at Close of Period        
Land 890,000      
Building and Land Improvements 6,535,000      
Total 7,425,000      
Accumulated Depreciation   (3,248,000)    
6940 Columbia Gateway Drive [Member]        
Initial Cost        
Land 3,545,000      
Building and Land Improvements 9,916,000      
Costs Capitalized Subsequent to Acquisition 5,537,000      
Gross Amounts Carried at Close of Period        
Land 3,545,000      
Building and Land Improvements 15,453,000      
Total 18,998,000      
Accumulated Depreciation   (7,000,000)    
6950 Columbia Gateway Drive [Member]        
Initial Cost        
Land 3,596,000      
Building and Land Improvements 14,269,000      
Costs Capitalized Subsequent to Acquisition 3,087,000      
Gross Amounts Carried at Close of Period        
Land 3,596,000      
Building and Land Improvements 17,356,000      
Total 20,952,000      
Accumulated Depreciation   (7,506,000)    
7000 Columbia Gateway Drive [Member]        
Initial Cost        
Land 3,131,000      
Building and Land Improvements 12,103,000      
Costs Capitalized Subsequent to Acquisition 2,138,000      
Gross Amounts Carried at Close of Period        
Land 3,131,000      
Building and Land Improvements 14,241,000      
Total 17,372,000      
Accumulated Depreciation   (4,482,000)    
7005 Columbia Gateway Drive [Member]        
Initial Cost        
Land 3,036,000      
Building and Land Improvements 189,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amounts Carried at Close of Period        
Land 3,036,000      
Building and Land Improvements 189,000      
Total 3,225,000      
Accumulated Depreciation   0    
7015 Albert Einstein Drive [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 1,570,000      
Initial Cost        
Land 2,058,000      
Building and Land Improvements 6,093,000      
Costs Capitalized Subsequent to Acquisition 1,527,000      
Gross Amounts Carried at Close of Period        
Land 2,058,000      
Building and Land Improvements 7,620,000      
Total 9,678,000      
Accumulated Depreciation   (2,915,000)    
7061 Columbia Gateway Drive [Member]        
Initial Cost        
Land 729,000      
Building and Land Improvements 3,094,000      
Costs Capitalized Subsequent to Acquisition 1,407,000      
Gross Amounts Carried at Close of Period        
Land 729,000      
Building and Land Improvements 4,501,000      
Total 5,230,000      
Accumulated Depreciation   (1,802,000)    
7063 Columbia Gateway Drive [Member]        
Initial Cost        
Land 902,000      
Building and Land Improvements 3,684,000      
Costs Capitalized Subsequent to Acquisition 2,512,000      
Gross Amounts Carried at Close of Period        
Land 902,000      
Building and Land Improvements 6,196,000      
Total 7,098,000      
Accumulated Depreciation   (2,452,000)    
7065 Columbia Gateway Drive [Member]        
Initial Cost        
Land 919,000      
Building and Land Improvements 3,763,000      
Costs Capitalized Subsequent to Acquisition 3,095,000      
Gross Amounts Carried at Close of Period        
Land 919,000      
Building and Land Improvements 6,858,000      
Total 7,777,000      
Accumulated Depreciation   (2,773,000)    
7067 Columbia Gateway Drive [Member]        
Initial Cost        
Land 1,829,000      
Building and Land Improvements 11,823,000      
Costs Capitalized Subsequent to Acquisition 2,838,000      
Gross Amounts Carried at Close of Period        
Land 1,829,000      
Building and Land Improvements 14,661,000      
Total 16,490,000      
Accumulated Depreciation   (6,154,000)    
7125 Columbia Gateway Drive [Member]        
Initial Cost        
Land 3,361,000      
Building and Land Improvements 1,677,000      
Costs Capitalized Subsequent to Acquisition 279,000      
Gross Amounts Carried at Close of Period        
Land 3,361,000      
Building and Land Improvements 1,956,000      
Total 5,317,000      
7125 Columbia Gateway Drive [Member]        
Initial Cost        
Land 17,126,000      
Building and Land Improvements 46,994,000      
Costs Capitalized Subsequent to Acquisition 9,813,000      
Gross Amounts Carried at Close of Period        
Land 17,126,000      
Building and Land Improvements 56,807,000      
Total 73,933,000      
Accumulated Depreciation   (16,632,000)    
7130 Columbia Gateway Drive [Member]        
Initial Cost        
Land 1,350,000      
Building and Land Improvements 4,359,000      
Costs Capitalized Subsequent to Acquisition 1,906,000      
Gross Amounts Carried at Close of Period        
Land 1,350,000      
Building and Land Improvements 6,265,000      
Total 7,615,000      
Accumulated Depreciation   (2,692,000)    
7134 Columbia Gateway Drive [Member]        
Initial Cost        
Land 704,000      
Building and Land Improvements 2,139,000      
Costs Capitalized Subsequent to Acquisition 314,000      
Gross Amounts Carried at Close of Period        
Land 704,000      
Building and Land Improvements 2,453,000      
Total 3,157,000      
Accumulated Depreciation   (1,234,000)    
7138 Columbia Gateway Drive [Member]        
Initial Cost        
Land 1,104,000      
Building and Land Improvements 3,518,000      
Costs Capitalized Subsequent to Acquisition 2,118,000      
Gross Amounts Carried at Close of Period        
Land 1,104,000      
Building and Land Improvements 5,636,000      
Total 6,740,000      
Accumulated Depreciation   (3,139,000)    
7142 Columbia Gateway Drive [Member]        
Initial Cost        
Land 1,342,000      
Building and Land Improvements 3,978,000      
Costs Capitalized Subsequent to Acquisition 2,502,000      
Gross Amounts Carried at Close of Period        
Land 1,342,000      
Building and Land Improvements 6,480,000      
Total 7,822,000      
Accumulated Depreciation   (2,322,000)    
7150 Columbia Gateway Drive [Member]        
Initial Cost        
Land 1,032,000      
Building and Land Improvements 3,429,000      
Costs Capitalized Subsequent to Acquisition 665,000      
Gross Amounts Carried at Close of Period        
Land 1,032,000      
Building and Land Improvements 4,094,000      
Total 5,126,000      
Accumulated Depreciation   (1,170,000)    
7150 Riverwood Drive [Member]        
Initial Cost        
Land 1,821,000      
Building and Land Improvements 4,388,000      
Costs Capitalized Subsequent to Acquisition 1,713,000      
Gross Amounts Carried at Close of Period        
Land 1,821,000      
Building and Land Improvements 6,101,000      
Total 7,922,000      
Accumulated Depreciation   (1,933,000)    
7160 Riverwood Drive [Member]        
Initial Cost        
Land 2,732,000      
Building and Land Improvements 7,006,000      
Costs Capitalized Subsequent to Acquisition 2,275,000      
Gross Amounts Carried at Close of Period        
Land 2,732,000      
Building and Land Improvements 9,281,000      
Total 12,013,000      
Accumulated Depreciation   (3,265,000)    
7170 Riverwood Drive [Member]        
Initial Cost        
Land 1,283,000      
Building and Land Improvements 3,096,000      
Costs Capitalized Subsequent to Acquisition 692,000      
Gross Amounts Carried at Close of Period        
Land 1,283,000      
Building and Land Improvements 3,788,000      
Total 5,071,000      
Accumulated Depreciation   (1,386,000)    
7175 Riverwood Drive [Member]        
Initial Cost        
Land 1,788,000      
Building and Land Improvements 7,269,000      
Gross Amounts Carried at Close of Period        
Land 1,788,000      
Building and Land Improvements 7,269,000      
Total 9,057,000      
Accumulated Depreciation   (389,000)    
7200 Redstone Gateway [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 6,649,000      
Initial Cost        
Land 0      
Building and Land Improvements 8,347,000      
Gross Amounts Carried at Close of Period        
Land 0      
Building and Land Improvements 8,347,000      
Total 8,347,000      
Accumulated Depreciation   (328,000)    
7200 Riverwood Road [Member]        
Initial Cost        
Land 4,089,000      
Building and Land Improvements 22,544,000      
Costs Capitalized Subsequent to Acquisition 3,994,000      
Gross Amounts Carried at Close of Period        
Land 4,089,000      
Building and Land Improvements 26,538,000      
Total 30,627,000      
Accumulated Depreciation   (8,761,000)    
7205 Riverwood Drive [Member]        
Initial Cost        
Land 1,367,000      
Building and Land Improvements 21,484,000      
Gross Amounts Carried at Close of Period        
Land 1,367,000      
Building and Land Improvements 21,484,000      
Total 22,851,000      
Accumulated Depreciation   (1,310,000)    
7272 Park Circle Drive [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 4,747,000      
Initial Cost        
Land 1,479,000      
Building and Land Improvements 6,300,000      
Costs Capitalized Subsequent to Acquisition 3,883,000      
Gross Amounts Carried at Close of Period        
Land 1,479,000      
Building and Land Improvements 10,183,000      
Total 11,662,000      
Accumulated Depreciation   (2,956,000)    
7318 Parkway Drive [Member]        
Initial Cost        
Land 972,000      
Building and Land Improvements 3,888,000      
Costs Capitalized Subsequent to Acquisition 1,002,000      
Gross Amounts Carried at Close of Period        
Land 972,000      
Building and Land Improvements 4,890,000      
Total 5,862,000      
Accumulated Depreciation   (2,084,000)    
7320 Parkway Drive [Member]        
Initial Cost        
Land 905,000      
Building and Land Improvements 3,570,000      
Costs Capitalized Subsequent to Acquisition 5,048,000      
Gross Amounts Carried at Close of Period        
Land 905,000      
Building and Land Improvements 8,618,000      
Total 9,523,000      
Accumulated Depreciation   (2,883,000)    
7400 Redstone Gateway [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 7,292,000      
Initial Cost        
Land 0      
Building and Land Improvements 9,012,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amounts Carried at Close of Period        
Land 0      
Building and Land Improvements 9,012,000      
Total 9,012,000      
Accumulated Depreciation   (121,000)    
7467 Ridge Road [Member]        
Initial Cost        
Land 1,629,000      
Building and Land Improvements 6,517,000      
Costs Capitalized Subsequent to Acquisition 3,645,000      
Gross Amounts Carried at Close of Period        
Land 1,629,000      
Building and Land Improvements 10,162,000      
Total 11,791,000      
Accumulated Depreciation   (4,439,000)    
7740 Milestone Parkway [Member]        
Real Estate and Accumulated Depreciation        
Encumbrances 18,987,000      
Initial Cost        
Land 3,825,000      
Building and Land Improvements 34,176,000      
Costs Capitalized Subsequent to Acquisition 404,000      
Gross Amounts Carried at Close of Period        
Land 3,825,000      
Building and Land Improvements 34,580,000      
Total 38,405,000      
Accumulated Depreciation (4,692,000)      
7770 Backlick Road [Member]        
Initial Cost        
Land 6,387,000      
Building and Land Improvements 74,325,000      
Costs Capitalized Subsequent to Acquisition 141,000      
Gross Amounts Carried at Close of Period        
Land 6,387,000      
Building and Land Improvements 74,466,000      
Total 80,853,000      
Accumulated Depreciation (5,292,000)      
7880 Milestone Parkway [Member]        
Initial Cost        
Land 4,857,000      
Building and Land Improvements 23,647,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amounts Carried at Close of Period        
Land 4,857,000      
Building and Land Improvements 23,647,000      
Total 28,504,000      
Accumulated Depreciation (215,000)      
8003 Corporate Drive [Member]        
Initial Cost        
Land 611,000      
Building and Land Improvements 1,126,000      
Costs Capitalized Subsequent to Acquisition 685,000      
Gross Amounts Carried at Close of Period        
Land 611,000      
Building and Land Improvements 1,811,000      
Total 2,422,000      
Accumulated Depreciation (99,000)      
8007 Corporate Drive [Member]        
Initial Cost        
Land 1,434,000      
Building and Land Improvements 350,000      
Costs Capitalized Subsequent to Acquisition 1,218,000      
Gross Amounts Carried at Close of Period        
Land 1,434,000      
Building and Land Improvements 1,568,000      
Total 3,002,000      
Accumulated Depreciation (278,000)      
8010 Corporate Drive [Member]        
Initial Cost        
Land 1,349,000      
Building and Land Improvements 3,262,000      
Costs Capitalized Subsequent to Acquisition 1,744,000      
Gross Amounts Carried at Close of Period        
Land 1,349,000      
Building and Land Improvements 5,006,000      
Total 6,355,000      
Accumulated Depreciation (1,448,000)      
8013 Corporate Drive [Member]        
Initial Cost        
Land 642,000      
Building and Land Improvements 1,072,000      
Costs Capitalized Subsequent to Acquisition 1,808,000      
Gross Amounts Carried at Close of Period        
Land 642,000      
Building and Land Improvements 2,880,000      
Total 3,522,000      
Accumulated Depreciation (519,000)      
8015 Corporate Drive [Member]        
Initial Cost        
Land 446,000      
Building and Land Improvements 1,116,000      
Costs Capitalized Subsequent to Acquisition 466,000      
Gross Amounts Carried at Close of Period        
Land 446,000      
Building and Land Improvements 1,582,000      
Total 2,028,000      
Accumulated Depreciation (468,000)      
8019 Corporate Drive [Member]        
Initial Cost        
Land 680,000      
Building and Land Improvements 1,898,000      
Costs Capitalized Subsequent to Acquisition 825,000      
Gross Amounts Carried at Close of Period        
Land 680,000      
Building and Land Improvements 2,723,000      
Total 3,403,000      
Accumulated Depreciation (827,000)      
8020 Corporate Drive [Member]        
Initial Cost        
Land 2,184,000      
Building and Land Improvements 3,767,000      
Costs Capitalized Subsequent to Acquisition 2,205,000      
Gross Amounts Carried at Close of Period        
Land 2,184,000      
Building and Land Improvements 5,972,000      
Total 8,156,000      
Accumulated Depreciation (1,703,000)      
8023 Corporate Drive [Member]        
Initial Cost        
Land 651,000      
Building and Land Improvements 1,164,000      
Costs Capitalized Subsequent to Acquisition 5,000      
Gross Amounts Carried at Close of Period        
Land 651,000      
Building and Land Improvements 1,169,000      
Total 1,820,000      
Accumulated Depreciation (47,000)      
8094 Sandpiper Circle [Member]        
Initial Cost        
Land 1,960,000      
Building and Land Improvements 3,716,000      
Costs Capitalized Subsequent to Acquisition 1,129,000      
Gross Amounts Carried at Close of Period        
Land 1,960,000      
Building and Land Improvements 4,845,000      
Total 6,805,000      
Accumulated Depreciation (1,267,000)      
8098 Sandpiper Circle [Member]        
Initial Cost        
Land 1,797,000      
Building and Land Improvements 3,651,000      
Costs Capitalized Subsequent to Acquisition 639,000      
Gross Amounts Carried at Close of Period        
Land 1,797,000      
Building and Land Improvements 4,290,000      
Total 6,087,000      
Accumulated Depreciation (929,000)      
8110 Corporate Drive [Member]        
Initial Cost        
Land 2,285,000      
Building and Land Improvements 10,117,000      
Costs Capitalized Subsequent to Acquisition 989,000      
Gross Amounts Carried at Close of Period        
Land 2,285,000      
Building and Land Improvements 11,106,000      
Total 13,391,000      
Accumulated Depreciation (3,133,000)      
8140 Corporate Drive [Member]        
Initial Cost        
Land 2,158,000      
Building and Land Improvements 8,457,000      
Costs Capitalized Subsequent to Acquisition 3,163,000      
Gross Amounts Carried at Close of Period        
Land 2,158,000      
Building and Land Improvements 11,620,000      
Total 13,778,000      
Accumulated Depreciation (4,117,000)      
8621 Robert Fulton Drive [Member]        
Initial Cost        
Land 2,317,000      
Building and Land Improvements 12,642,000      
Costs Capitalized Subsequent to Acquisition 344,000      
Gross Amounts Carried at Close of Period        
Land 2,317,000      
Building and Land Improvements 12,986,000      
Total 15,303,000      
Accumulated Depreciation (3,378,000)      
8661 Robert Fulton Drive [Member]        
Initial Cost        
Land 1,510,000      
Building and Land Improvements 3,764,000      
Costs Capitalized Subsequent to Acquisition 2,420,000      
Gross Amounts Carried at Close of Period        
Land 1,510,000      
Building and Land Improvements 6,184,000      
Total 7,694,000      
Accumulated Depreciation (2,117,000)      
8671 Robert Fulton Drive [Member]        
Initial Cost        
Land 1,718,000      
Building and Land Improvements 4,280,000      
Costs Capitalized Subsequent to Acquisition 3,931,000      
Gross Amounts Carried at Close of Period        
Land 1,718,000      
Building and Land Improvements 8,211,000      
Total 9,929,000      
Accumulated Depreciation (3,060,000)      
870 Elkridge Landing Road [Member]        
Initial Cost        
Land 2,003,000      
Building and Land Improvements 9,442,000      
Costs Capitalized Subsequent to Acquisition 7,616,000      
Gross Amounts Carried at Close of Period        
Land 2,003,000      
Building and Land Improvements 17,058,000      
Total 19,061,000      
Accumulated Depreciation (8,411,000)      
891 Elkridge Landing Road [Member]        
Initial Cost        
Land 1,165,000      
Building and Land Improvements 4,772,000      
Costs Capitalized Subsequent to Acquisition 2,928,000      
Gross Amounts Carried at Close of Period        
Land 1,165,000      
Building and Land Improvements 7,700,000      
Total 8,865,000      
Accumulated Depreciation (3,488,000)      
900 Elkridge Landing Road [Member]        
Initial Cost        
Land 1,993,000      
Building and Land Improvements 7,972,000      
Costs Capitalized Subsequent to Acquisition 3,603,000      
Gross Amounts Carried at Close of Period        
Land 1,993,000      
Building and Land Improvements 11,575,000      
Total 13,568,000      
Accumulated Depreciation (6,009,000)      
901 Elkridge Landing Road [Member]        
Initial Cost        
Land 1,156,000      
Building and Land Improvements 4,437,000      
Costs Capitalized Subsequent to Acquisition 2,390,000      
Gross Amounts Carried at Close of Period        
Land 1,156,000      
Building and Land Improvements 6,827,000      
Total 7,983,000      
Accumulated Depreciation (3,015,000)      
911 Elkridge Landing Road [Member]        
Initial Cost        
Land 1,215,000      
Building and Land Improvements 4,861,000      
Costs Capitalized Subsequent to Acquisition 2,024,000      
Gross Amounts Carried at Close of Period        
Land 1,215,000      
Building and Land Improvements 6,885,000      
Total 8,100,000      
Accumulated Depreciation (3,462,000)      
921 Elkridge Landing Road [Member]        
Initial Cost        
Land 1,044,000      
Building and Land Improvements 4,727,000      
Costs Capitalized Subsequent to Acquisition 748,000      
Gross Amounts Carried at Close of Period        
Land 1,044,000      
Building and Land Improvements 5,475,000      
Total 6,519,000      
Accumulated Depreciation (4,924,000)      
938 Elkridge Landing Road [Member]        
Initial Cost        
Land 922,000      
Building and Land Improvements 4,748,000      
Costs Capitalized Subsequent to Acquisition 1,263,000      
Gross Amounts Carried at Close of Period        
Land 922,000      
Building and Land Improvements 6,011,000      
Total 6,933,000      
Accumulated Depreciation (2,116,000)      
939 Elkridge Landing Road [Member]        
Initial Cost        
Land 939,000      
Building and Land Improvements 3,756,000      
Costs Capitalized Subsequent to Acquisition 4,245,000      
Gross Amounts Carried at Close of Period        
Land 939,000      
Building and Land Improvements 8,001,000      
Total 8,940,000      
Accumulated Depreciation (3,337,000)      
940 Elkridge Landing Road [Member]        
Initial Cost        
Land 842,000      
Building and Land Improvements 4,000      
Costs Capitalized Subsequent to Acquisition 0      
Gross Amounts Carried at Close of Period        
Land 842,000      
Building and Land Improvements 4,000      
Total 846,000      
Accumulated Depreciation 0      
9651 Hornbaker Road [Member]        
Initial Cost        
Land 6,050,000      
Building and Land Improvements 249,706,000      
Costs Capitalized Subsequent to Acquisition 985,000      
Gross Amounts Carried at Close of Period        
Land 6,050,000      
Building and Land Improvements 250,691,000      
Total 256,741,000      
Accumulated Depreciation (18,119,000)      
Aerotech Commerce [Member]        
Initial Cost        
Land 900,000      
Gross Amounts Carried at Close of Period        
Land 900,000      
Total 900,000      
Arborcrest [Member]        
Initial Cost        
Land 21,968,000      
Building and Land Improvements 122,759,000      
Costs Capitalized Subsequent to Acquisition 1,301,000      
Gross Amounts Carried at Close of Period        
Land 21,968,000      
Building and Land Improvements 124,060,000      
Total 146,028,000      
Accumulated Depreciation (25,901,000)      
Arundel Preserve [Member]        
Initial Cost        
Land 13,401,000      
Building and Land Improvements 9,331,000      
Gross Amounts Carried at Close of Period        
Land 13,401,000      
Building and Land Improvements 9,331,000      
Total 22,732,000      
Ashburn Crossing - DC 10 [Member]        
Initial Cost        
Land 4,408,000      
Building and Land Improvements 10,689,000      
Gross Amounts Carried at Close of Period        
Land 4,408,000      
Building and Land Improvements 10,689,000      
Total 15,097,000      
Accumulated Depreciation (225,000)      
Canton Crossing Land [Member]        
Initial Cost        
Land 16,085,000      
Building and Land Improvements 2,134,000      
Gross Amounts Carried at Close of Period        
Land 16,085,000      
Building and Land Improvements 2,134,000      
Total 18,219,000      
Canton Crossing Util Distr Ctr [Member]        
Initial Cost        
Land 7,300,000      
Building and Land Improvements 15,556,000      
Costs Capitalized Subsequent to Acquisition 942,000      
Gross Amounts Carried at Close of Period        
Land 7,300,000      
Building and Land Improvements 16,498,000      
Total 23,798,000      
Accumulated Depreciation (3,326,000)      
Columbia Gateway - Southridge [Member]        
Initial Cost        
Land 6,387,000      
Building and Land Improvements 3,539,000      
Gross Amounts Carried at Close of Period        
Land 6,387,000      
Building and Land Improvements 3,539,000      
Total 9,926,000      
Dahlgren Technology Center [Member]        
Initial Cost        
Land 978,000      
Building and Land Improvements 178,000      
Gross Amounts Carried at Close of Period        
Land 978,000      
Building and Land Improvements 178,000      
Total 1,156,000      
Expedition VII [Member]        
Initial Cost        
Land 705,000      
Building and Land Improvements 728,000      
Gross Amounts Carried at Close of Period        
Land 705,000      
Building and Land Improvements 728,000      
Total 1,433,000      
InterQuest [Member]        
Initial Cost        
Land 8,201,000      
Building and Land Improvements 0      
Gross Amounts Carried at Close of Period        
Land 8,201,000      
Building and Land Improvements 0      
Total 8,201,000      
M Square Research Park [Member]        
Initial Cost        
Building and Land Improvements 2,986,000      
Gross Amounts Carried at Close of Period        
Building and Land Improvements 2,986,000      
Total 2,986,000      
National Business Park North [Member]        
Initial Cost        
Land 28,066,000      
Building and Land Improvements 41,936,000      
Gross Amounts Carried at Close of Period        
Land 28,066,000      
Building and Land Improvements 41,936,000      
Total 70,002,000      
North Gate Business Park [Member]        
Initial Cost        
Land 6,309,000      
Building and Land Improvements 4,540,000      
Gross Amounts Carried at Close of Period        
Land 6,309,000      
Building and Land Improvements 4,540,000      
Total 10,849,000      
Northwest Crossroads [Member]        
Initial Cost        
Land 7,430,000      
Building and Land Improvements 847,000      
Gross Amounts Carried at Close of Period        
Land 7,430,000      
Building and Land Improvements 847,000      
Total 8,277,000      
NOVA Office A [Member]        
Initial Cost        
Land 2,096,000      
Building and Land Improvements 47,364,000      
Gross Amounts Carried at Close of Period        
Land 2,096,000      
Building and Land Improvements 47,364,000      
Total 49,460,000      
Accumulated Depreciation (1,046,000)      
NOVA Office B [Member]        
Initial Cost        
Land 739,000      
Building and Land Improvements 26,277,000      
Gross Amounts Carried at Close of Period        
Land 739,000      
Building and Land Improvements 26,277,000      
Total 27,016,000      
NOVA Office D [Member]        
Initial Cost        
Land 6,587,000      
Building and Land Improvements 103,000      
Gross Amounts Carried at Close of Period        
Land 6,587,000      
Building and Land Improvements 103,000      
Total 6,690,000      
Old Annapolis Road [Member]        
Initial Cost        
Land 1,637,000      
Building and Land Improvements 5,500,000      
Costs Capitalized Subsequent to Acquisition 3,457,000      
Gross Amounts Carried at Close of Period        
Land 1,637,000      
Building and Land Improvements 8,957,000      
Total 10,594,000      
Accumulated Depreciation (2,983,000)      
Patriot Park [Member]        
Initial Cost        
Land 2,328,000      
Building and Land Improvements 1,000      
Gross Amounts Carried at Close of Period        
Land 2,328,000      
Building and Land Improvements 1,000      
Total 2,329,000      
Patriot Point - DC15 [Member]        
Initial Cost        
Land 12,156,000      
Building and Land Improvements 7,112,000      
Gross Amounts Carried at Close of Period        
Land 12,156,000      
Building and Land Improvements 7,112,000      
Total 19,268,000      
Patriot Point - DC16 [Member]        
Initial Cost        
Land 12,156,000      
Building and Land Improvements 4,110,000      
Gross Amounts Carried at Close of Period        
Land 12,156,000      
Building and Land Improvements 4,110,000      
Total 16,266,000      
Patriot Point - DC17 [Member]        
Initial Cost        
Land 6,078,000      
Building and Land Improvements 472,000      
Gross Amounts Carried at Close of Period        
Land 6,078,000      
Building and Land Improvements 472,000      
Total 6,550,000      
Patriot Ridge [Member]        
Initial Cost        
Land 18,517,000      
Building and Land Improvements 14,423,000      
Gross Amounts Carried at Close of Period        
Land 18,517,000      
Building and Land Improvements 14,423,000      
Total 32,940,000      
Redstone Gateway [Member]        
Initial Cost        
Building and Land Improvements 14,250,000      
Gross Amounts Carried at Close of Period        
Building and Land Improvements 14,250,000      
Total 14,250,000      
Route 15/Biggs Ford Road [Member]        
Initial Cost        
Land 8,703,000      
Building and Land Improvements 596,000      
Gross Amounts Carried at Close of Period        
Land 8,703,000      
Building and Land Improvements 596,000      
Total 9,299,000      
Sentry Gateway [Member]        
Initial Cost        
Land 8,275,000      
Building and Land Improvements 3,645,000      
Gross Amounts Carried at Close of Period        
Land 8,275,000      
Building and Land Improvements 3,645,000      
Total 11,920,000      
Sentry Gateway - T [Member]        
Initial Cost        
Land 14,020,000      
Building and Land Improvements 38,804,000      
Costs Capitalized Subsequent to Acquisition 13,000      
Gross Amounts Carried at Close of Period        
Land 14,020,000      
Building and Land Improvements 38,817,000      
Total 52,837,000      
Accumulated Depreciation (8,618,000)      
Sentry Gateway - V [Member]        
Initial Cost        
Building and Land Improvements 1,066,000      
Gross Amounts Carried at Close of Period        
Building and Land Improvements 1,066,000      
Total 1,066,000      
Accumulated Depreciation (188,000)      
Sentry Gateway - W [Member]        
Initial Cost        
Building and Land Improvements 1,884,000      
Gross Amounts Carried at Close of Period        
Building and Land Improvements 1,884,000      
Total 1,884,000      
Accumulated Depreciation (296,000)      
Sentry Gateway - X [Member]        
Initial Cost        
Land 1,964,000      
Building and Land Improvements 21,178,000      
Gross Amounts Carried at Close of Period        
Land 1,964,000      
Building and Land Improvements 21,178,000      
Total 23,142,000      
Accumulated Depreciation (2,728,000)      
Sentry Gateway - Y [Member]        
Initial Cost        
Land 1,964,000      
Building and Land Improvements 21,298,000      
Gross Amounts Carried at Close of Period        
Land 1,964,000      
Building and Land Improvements 21,298,000      
Total 23,262,000      
Accumulated Depreciation (2,745,000)      
Sentry Gateway - Z [Member]        
Initial Cost        
Land 1,964,000      
Building and Land Improvements 30,335,000      
Gross Amounts Carried at Close of Period        
Land 1,964,000      
Building and Land Improvements 30,335,000      
Total 32,299,000      
Accumulated Depreciation (616,000)      
Southpoint Manassas - DC12 [Member]        
Initial Cost        
Land 4,518,000      
Building and Land Improvements 12,701,000      
Gross Amounts Carried at Close of Period        
Land 4,518,000      
Building and Land Improvements 12,701,000      
Total 17,219,000      
Accumulated Depreciation (127,000)      
Southpoint Manassas - DC14 [Member]        
Initial Cost        
Land 4,518,000      
Building and Land Improvements 13,009,000      
Gross Amounts Carried at Close of Period        
Land 4,518,000      
Building and Land Improvements 13,009,000      
Total 17,527,000      
Accumulated Depreciation (101,000)      
Westfields - Park Center [Member]        
Initial Cost        
Land 16,418,000      
Building and Land Improvements 7,488,000      
Gross Amounts Carried at Close of Period        
Land 16,418,000      
Building and Land Improvements 7,488,000      
Total 23,906,000      
Westfields Corporate Center [Member]        
Initial Cost        
Land 7,141,000      
Building and Land Improvements 1,423,000      
Gross Amounts Carried at Close of Period        
Land 7,141,000      
Building and Land Improvements 1,423,000      
Total 8,564,000      
White Marsh [Member]        
Initial Cost        
Land 7,852,000      
Building and Land Improvements 2,570,000      
Gross Amounts Carried at Close of Period        
Land 7,852,000      
Building and Land Improvements 2,570,000      
Total 10,422,000      
Woodland Park [Member]        
Initial Cost        
Land 9,614,000      
Building and Land Improvements 85,000      
Gross Amounts Carried at Close of Period        
Land 9,614,000      
Building and Land Improvements 85,000      
Total 9,699,000      
Other Developments, including intercompany eliminations [Member]        
Initial Cost        
Land 94,000      
Building and Land Improvements 34,000      
Costs Capitalized Subsequent to Acquisition 431,000      
Gross Amounts Carried at Close of Period        
Land 94,000      
Building and Land Improvements 465,000      
Total 559,000      
Accumulated Depreciation (39,000)      
Fair value measurement on a nonrecurring basis [Member] | Real Estate Held [Member]        
Additional information        
Impairment losses 22,000,000      
Fair value measurement on a nonrecurring basis [Member] | Real Estate Investment Properties, Net [Member]        
Additional information        
Impairment losses $ 23,500,000 $ 1,400,000