Schedule III - Real Estate and Accumulated Depreciation (Details)

v3.6.0.2

Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Real Estate and Accumulated Depreciation
Encumbrances	$ 168,368
Initial Cost
Land	662,081
Building and Land Improvements	2,857,561
Costs Capitalized Subsequent to Acquisition	355,073
Gross Amounts Carried At Close of Period
Land	662,081
Building and Land Improvements	3,212,634
Total	3,874,715	$ 4,158,616	$ 4,014,336	$ 3,811,950
Accumulated Depreciation	(715,951)	(718,680)	(703,083)	$ (597,649)
Additional information
Debt excluded from encumbrances	1,904,001	2,077,752
Net discounts and deferred financing costs	16,200
Aggregate cost of assets for federal income tax purposes	3,400,000
Impairment losses	$ 101,391	23,289	$ 1,416
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
Term Loan Facilities [Member]
Additional information
Debt excluded from encumbrances	$ 547,494	$ 515,902
Unsecured Senior Notes [Member]
Additional information
Debt excluded from encumbrances	1,200,000
Unsecured notes payable [Member]
Additional information
Debt excluded from encumbrances	1,400
Fixed rate mortgage loans [Member]
Additional information
Net discounts and deferred financing costs	777
100 Light Street [Member]
Real Estate and Accumulated Depreciation
Encumbrances	50,244
Initial Cost
Land	26,715
Building and Land Improvements	58,343
Costs Capitalized Subsequent to Acquisition	2,388
Gross Amounts Carried At Close of Period
Land	26,715
Building and Land Improvements	60,731
Total	87,446
Accumulated Depreciation	(5,353)
1000 Redstone Gateway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	11,057
Initial Cost
Building and Land Improvements	20,533
Costs Capitalized Subsequent to Acquisition	5
Gross Amounts Carried At Close of Period
Building and Land Improvements	20,538
Total	20,538
Accumulated Depreciation	(1,951)
1100 Redstone Gateway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	11,513
Initial Cost
Building and Land Improvements	19,593
Gross Amounts Carried At Close of Period
Building and Land Improvements	19,593
Total	19,593
Accumulated Depreciation	(1,455)
114 National Business Parkway [Member]
Initial Cost
Land	364
Building and Land Improvements	3,109
Costs Capitalized Subsequent to Acquisition	117
Gross Amounts Carried At Close of Period
Land	364
Building and Land Improvements	3,226
Total	3,590
Accumulated Depreciation	(1,213)
11751 Meadowville Lane [Member]
Initial Cost
Land	1,305
Building and Land Improvements	52,098
Costs Capitalized Subsequent to Acquisition	112
Gross Amounts Carried At Close of Period
Land	1,305
Building and Land Improvements	52,210
Total	53,515
Accumulated Depreciation	(12,636)
1200 Redstone Gateway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	13,313
Initial Cost
Building and Land Improvements	22,389
Gross Amounts Carried At Close of Period
Building and Land Improvements	22,389
Total	22,389
Accumulated Depreciation	(1,705)
1201 M Street [Member]
Initial Cost
Building and Land Improvements	49,784
Costs Capitalized Subsequent to Acquisition	6,916
Gross Amounts Carried At Close of Period
Building and Land Improvements	56,700
Total	56,700
Accumulated Depreciation	(10,789)
1201 Winterson Road [Member]
Initial Cost
Land	1,288
Building and Land Improvements	13,184
Costs Capitalized Subsequent to Acquisition	460
Gross Amounts Carried At Close of Period
Land	1,288
Building and Land Improvements	13,644
Total	14,932
Accumulated Depreciation	(3,984)
1220 12th Street, SE [Member]
Initial Cost
Building and Land Improvements	42,464
Costs Capitalized Subsequent to Acquisition	4,026
Gross Amounts Carried At Close of Period
Building and Land Improvements	46,490
Total	46,490
Accumulated Depreciation	(10,005)
1243 Winterson Road [Member]
Initial Cost
Land	630
Gross Amounts Carried At Close of Period
Land	630
Total	630
131 National Business Parkway [Member]
Initial Cost
Land	1,906
Building and Land Improvements	7,587
Costs Capitalized Subsequent to Acquisition	3,593
Gross Amounts Carried At Close of Period
Land	1,906
Building and Land Improvements	11,180
Total	13,086
Accumulated Depreciation	(5,903)
132 National Business Parkway [Member]
Initial Cost
Land	2,917
Building and Land Improvements	12,259
Costs Capitalized Subsequent to Acquisition	4,116
Gross Amounts Carried At Close of Period
Land	2,917
Building and Land Improvements	16,375
Total	19,292
Accumulated Depreciation	(8,121)
133 National Business Parkway [Member]
Initial Cost
Land	2,517
Building and Land Improvements	10,068
Costs Capitalized Subsequent to Acquisition	5,238
Gross Amounts Carried At Close of Period
Land	2,517
Building and Land Improvements	15,306
Total	17,823
Accumulated Depreciation	(8,843)
1334 Ashton Road [Member]
Initial Cost
Land	736
Building and Land Improvements	1,488
Costs Capitalized Subsequent to Acquisition	2,639
Gross Amounts Carried At Close of Period
Land	736
Building and Land Improvements	4,127
Total	4,863
Accumulated Depreciation	(2,598)
134 National Business Parkway [Member]
Initial Cost
Land	3,684
Building and Land Improvements	7,517
Costs Capitalized Subsequent to Acquisition	3,693
Gross Amounts Carried At Close of Period
Land	3,684
Building and Land Improvements	11,210
Total	14,894
Accumulated Depreciation	(4,687)
1340 Ashton Road [Member]
Initial Cost
Land	905
Building and Land Improvements	3,620
Costs Capitalized Subsequent to Acquisition	1,470
Gross Amounts Carried At Close of Period
Land	905
Building and Land Improvements	5,090
Total	5,995
Accumulated Depreciation	(2,738)
13450 Sunrise Valley Road [Member]
Initial Cost
Land	1,386
Building and Land Improvements	5,576
Costs Capitalized Subsequent to Acquisition	4,553
Gross Amounts Carried At Close of Period
Land	1,386
Building and Land Improvements	10,129
Total	11,515
Accumulated Depreciation	(4,320)
13454 Sunrise Valley Road [Member]
Initial Cost
Land	2,899
Building and Land Improvements	11,986
Costs Capitalized Subsequent to Acquisition	6,936
Gross Amounts Carried At Close of Period
Land	2,899
Building and Land Improvements	18,922
Total	21,821
Accumulated Depreciation	(8,111)
135 National Business Parkway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	2,484
Building and Land Improvements	9,750
Costs Capitalized Subsequent to Acquisition	5,991
Gross Amounts Carried At Close of Period
Land	2,484
Building and Land Improvements	15,741
Total	18,225
Accumulated Depreciation	(7,201)
1362 Mellon Road [Member]
Initial Cost
Land	1,706
Building and Land Improvements	3,108
Costs Capitalized Subsequent to Acquisition	182
Gross Amounts Carried At Close of Period
Land	1,706
Building and Land Improvements	3,290
Total	4,996
Accumulated Depreciation	(31)
13857 McLearen Road [Member]
Initial Cost
Land	3,507
Building and Land Improvements	30,176
Costs Capitalized Subsequent to Acquisition	1,603
Gross Amounts Carried At Close of Period
Land	3,507
Building and Land Improvements	31,779
Total	35,286
Accumulated Depreciation	(8,977)
140 National Business Parkway [Member]
Initial Cost
Land	3,407
Building and Land Improvements	24,167
Costs Capitalized Subsequent to Acquisition	1,055
Gross Amounts Carried At Close of Period
Land	3,407
Building and Land Improvements	25,222
Total	28,629
Accumulated Depreciation	(8,263)
141 National Business Parkway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	2,398
Building and Land Improvements	9,493
Costs Capitalized Subsequent to Acquisition	4,008
Gross Amounts Carried At Close of Period
Land	2,398
Building and Land Improvements	13,501
Total	15,899
Accumulated Depreciation	(6,376)
14280 Park Meadow Drive [Member]
Initial Cost
Land	3,731
Building and Land Improvements	15,953
Costs Capitalized Subsequent to Acquisition	2,614
Gross Amounts Carried At Close of Period
Land	3,731
Building and Land Improvements	18,567
Total	22,298
Accumulated Depreciation	(6,740)
1460 Dorsey Road [Member]
Initial Cost
Land	1,577
Gross Amounts Carried At Close of Period
Land	1,577
Total	1,577
14840 Conference Center Drive [Member]
Initial Cost
Land	1,572
Building and Land Improvements	8,175
Costs Capitalized Subsequent to Acquisition	2,853
Gross Amounts Carried At Close of Period
Land	1,572
Building and Land Improvements	11,028
Total	12,600
Accumulated Depreciation	(4,873)
14850 Conference Center Drive [Member]
Initial Cost
Land	1,615
Building and Land Improvements	8,358
Costs Capitalized Subsequent to Acquisition	2,945
Gross Amounts Carried At Close of Period
Land	1,615
Building and Land Improvements	11,303
Total	12,918
Accumulated Depreciation	(5,309)
14900 Conference Center Drive [Member]
Initial Cost
Land	3,436
Building and Land Improvements	14,402
Costs Capitalized Subsequent to Acquisition	5,997
Gross Amounts Carried At Close of Period
Land	3,436
Building and Land Improvements	20,399
Total	23,835
Accumulated Depreciation	(9,164)
1501 South Clinton Street [Member]
Initial Cost
Land	27,964
Building and Land Improvements	51,990
Costs Capitalized Subsequent to Acquisition	8,588
Gross Amounts Carried At Close of Period
Land	27,964
Building and Land Improvements	60,578
Total	88,542
Accumulated Depreciation	(17,440)
15049 Conference Center Drive [Member]
Initial Cost
Land	4,415
Building and Land Improvements	20,365
Costs Capitalized Subsequent to Acquisition	12,380
Gross Amounts Carried At Close of Period
Land	4,415
Building and Land Improvements	32,745
Total	37,160
Accumulated Depreciation	(10,220)
15059 Conference Center Drive [Member]
Initial Cost
Land	5,753
Building and Land Improvements	13,615
Costs Capitalized Subsequent to Acquisition	3,063
Gross Amounts Carried At Close of Period
Land	5,753
Building and Land Improvements	16,678
Total	22,431
Accumulated Depreciation	(7,218)
1550 West Nursery Road [Member]
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	(4,214)
1560 West Nursery Road [Member]
Initial Cost
Land	1,441
Building and Land Improvements	113
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried At Close of Period
Land	1,441
Building and Land Improvements	113
Total	1,554
Accumulated Depreciation	(7)
1610 West Nursery Road [Member]
Initial Cost
Land	259
Building and Land Improvements	183
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried At Close of Period
Land	259
Building and Land Improvements	183
Total	442
1616 West Nursery Road [Member]
Initial Cost
Land	393
Building and Land Improvements	1,659
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried At Close of Period
Land	393
Building and Land Improvements	1,659
Total	2,052
1622 West Nursery Road [Member]
Initial Cost
Land	393
Building and Land Improvements	3,159
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried At Close of Period
Land	393
Building and Land Improvements	3,159
Total	3,552
16442 Commerce Drive [Member]
Initial Cost
Land	613
Building and Land Improvements	2,582
Costs Capitalized Subsequent to Acquisition	894
Gross Amounts Carried At Close of Period
Land	613
Building and Land Improvements	3,476
Total	4,089
Accumulated Depreciation	(1,442)
16480 Commerce Drive [Member]
Initial Cost
Land	1,856
Building and Land Improvements	7,425
Costs Capitalized Subsequent to Acquisition	1,655
Gross Amounts Carried At Close of Period
Land	1,856
Building and Land Improvements	9,080
Total	10,936
Accumulated Depreciation	(2,768)
16501 Commerce Drive [Member]
Initial Cost
Land	522
Building and Land Improvements	2,090
Costs Capitalized Subsequent to Acquisition	483
Gross Amounts Carried At Close of Period
Land	522
Building and Land Improvements	2,573
Total	3,095
Accumulated Depreciation	(882)
16539 Commerce Drive [Member]
Initial Cost
Land	688
Building and Land Improvements	2,859
Costs Capitalized Subsequent to Acquisition	1,923
Gross Amounts Carried At Close of Period
Land	688
Building and Land Improvements	4,782
Total	5,470
Accumulated Depreciation	(2,161)
16541 Commerce Drive [Member]
Initial Cost
Land	773
Building and Land Improvements	3,093
Costs Capitalized Subsequent to Acquisition	1,806
Gross Amounts Carried At Close of Period
Land	773
Building and Land Improvements	4,899
Total	5,672
Accumulated Depreciation	(1,865)
16543 Commerce Drive [Member]
Initial Cost
Land	436
Building and Land Improvements	1,742
Costs Capitalized Subsequent to Acquisition	593
Gross Amounts Carried At Close of Period
Land	436
Building and Land Improvements	2,335
Total	2,771
Accumulated Depreciation	(696)
1751 Pinnacle Drive [Member]
Initial Cost
Land	10,486
Building and Land Improvements	42,340
Costs Capitalized Subsequent to Acquisition	24,774
Gross Amounts Carried At Close of Period
Land	10,486
Building and Land Improvements	67,114
Total	77,600
Accumulated Depreciation	(26,774)
1753 Pinnacle Drive [Member]
Initial Cost
Land	8,275
Building and Land Improvements	34,353
Costs Capitalized Subsequent to Acquisition	11,219
Gross Amounts Carried At Close of Period
Land	8,275
Building and Land Improvements	45,572
Total	53,847
Accumulated Depreciation	(17,286)
201 Technology Drive [Member]
Initial Cost
Land	726
Building and Land Improvements	31,091
Costs Capitalized Subsequent to Acquisition	60
Gross Amounts Carried At Close of Period
Land	726
Building and Land Improvements	31,151
Total	31,877
Accumulated Depreciation	(7,212)
206 Research Boulevard [Member]
Initial Cost
Land	1,813
Building and Land Improvements	1,287
Gross Amounts Carried At Close of Period
Land	1,813
Building and Land Improvements	1,287
Total	3,100
Accumulated Depreciation	(18)
209 Research Boulevard [Member]
Initial Cost
Land	1,045
Building and Land Improvements	4,714
Costs Capitalized Subsequent to Acquisition	175
Gross Amounts Carried At Close of Period
Land	1,045
Building and Land Improvements	4,889
Total	5,934
Accumulated Depreciation	(86)
210 Research Boulevard [Member]
Initial Cost
Land	1,065
Building and Land Improvements	2,593
Costs Capitalized Subsequent to Acquisition	75
Gross Amounts Carried At Close of Period
Land	1,065
Building and Land Improvements	2,668
Total	3,733
Accumulated Depreciation	(53)
2100 L Street [Member]
Initial Cost
Land	35,868
Building and Land Improvements	4,702
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried At Close of Period
Land	35,868
Building and Land Improvements	4,702
Total	40,570
2100 Rideout Road [Member]
Initial Cost
Land	0
Building and Land Improvements	4,551
Costs Capitalized Subsequent to Acquisition	2,825
Gross Amounts Carried At Close of Period
Land	0
Building and Land Improvements	7,376
Total	7,376
Accumulated Depreciation	(44)
22289 Exploration Drive [Member]
Initial Cost
Land	1,422
Building and Land Improvements	5,719
Costs Capitalized Subsequent to Acquisition	1,758
Gross Amounts Carried At Close of Period
Land	1,422
Building and Land Improvements	7,477
Total	8,899
Accumulated Depreciation	(3,146)
22299 Exploration Drive [Member]
Initial Cost
Land	1,362
Building and Land Improvements	5,790
Costs Capitalized Subsequent to Acquisition	2,225
Gross Amounts Carried At Close of Period
Land	1,362
Building and Land Improvements	8,015
Total	9,377
Accumulated Depreciation	(3,123)
22300 Exploration Drive [Member]
Initial Cost
Land	1,094
Building and Land Improvements	5,038
Costs Capitalized Subsequent to Acquisition	1,320
Gross Amounts Carried At Close of Period
Land	1,094
Building and Land Improvements	6,358
Total	7,452
Accumulated Depreciation	(2,224)
22309 Exploration Drive [Member]
Initial Cost
Land	2,243
Building and Land Improvements	10,419
Costs Capitalized Subsequent to Acquisition	7,786
Gross Amounts Carried At Close of Period
Land	2,243
Building and Land Improvements	18,205
Total	20,448
Accumulated Depreciation	(5,383)
23535 Cottonwood Parkway [Member]
Initial Cost
Land	692
Building and Land Improvements	3,051
Costs Capitalized Subsequent to Acquisition	468
Gross Amounts Carried At Close of Period
Land	692
Building and Land Improvements	3,519
Total	4,211
Accumulated Depreciation	(1,363)
250 W Pratt St [Member]
Initial Cost
Land	8,057
Building and Land Improvements	34,605
Costs Capitalized Subsequent to Acquisition	6,452
Gross Amounts Carried At Close of Period
Land	8,057
Building and Land Improvements	41,057
Total	49,114
Accumulated Depreciation	(4,244)
2500 Riva Road [Member]
Initial Cost
Land	2,791
Building and Land Improvements	12,145
Costs Capitalized Subsequent to Acquisition	1
Gross Amounts Carried At Close of Period
Land	2,791
Building and Land Improvements	12,146
Total	14,937
Accumulated Depreciation	(4,761)
2600 Park Tower Drive [Member]
Initial Cost
Land	20,304
Building and Land Improvements	34,443
Costs Capitalized Subsequent to Acquisition	398
Gross Amounts Carried At Close of Period
Land	20,304
Building and Land Improvements	34,841
Total	55,145
Accumulated Depreciation	(2,406)
2691 Technology Drive [Member]
Initial Cost
Land	2,098
Building and Land Improvements	17,335
Costs Capitalized Subsequent to Acquisition	5,519
Gross Amounts Carried At Close of Period
Land	2,098
Building and Land Improvements	22,854
Total	24,952
Accumulated Depreciation	(8,722)
2701 Technology Drive [Member]
Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	1,737
Building and Land Improvements	15,266
Costs Capitalized Subsequent to Acquisition	4,367
Gross Amounts Carried At Close of Period
Land	1,737
Building and Land Improvements	19,633
Total	21,370
Accumulated Depreciation	(8,652)
2711 Technology Drive [Member]
Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	2,251
Building and Land Improvements	21,611
Costs Capitalized Subsequent to Acquisition	1,806
Gross Amounts Carried At Close of Period
Land	2,251
Building and Land Improvements	23,417
Total	25,668
Accumulated Depreciation	(10,727)
2720 Technology Drive [Member]
Initial Cost
Land	3,863
Building and Land Improvements	29,272
Costs Capitalized Subsequent to Acquisition	1,218
Gross Amounts Carried At Close of Period
Land	3,863
Building and Land Improvements	30,490
Total	34,353
Accumulated Depreciation	(9,173)
2721 Technology Drive [Member]
Initial Cost
Land	4,611
Building and Land Improvements	14,597
Costs Capitalized Subsequent to Acquisition	1,272
Gross Amounts Carried At Close of Period
Land	4,611
Building and Land Improvements	15,869
Total	20,480
Accumulated Depreciation	(6,970)
2730 Hercules Road [Member]
Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	8,737
Building and Land Improvements	31,611
Costs Capitalized Subsequent to Acquisition	8,697
Gross Amounts Carried At Close of Period
Land	8,737
Building and Land Improvements	40,308
Total	49,045
Accumulated Depreciation	(17,118)
30 Light Street [Member]
Real Estate and Accumulated Depreciation
Encumbrances	4,227
Initial Cost
Land	0
Building and Land Improvements	12,101
Costs Capitalized Subsequent to Acquisition	51
Gross Amounts Carried At Close of Period
Land	0
Building and Land Improvements	12,152
Total	12,152
Accumulated Depreciation	(435)
300 Sentinel Drive [Member]
Initial Cost
Land	1,517
Building and Land Improvements	59,186
Costs Capitalized Subsequent to Acquisition	913
Gross Amounts Carried At Close of Period
Land	1,517
Building and Land Improvements	60,099
Total	61,616
Accumulated Depreciation	(9,991)
302 Sentinel Drive [Member]
Initial Cost
Land	2,648
Building and Land Improvements	29,687
Costs Capitalized Subsequent to Acquisition	454
Gross Amounts Carried At Close of Period
Land	2,648
Building and Land Improvements	30,141
Total	32,789
Accumulated Depreciation	(6,791)
304 Sentinel Drive [Member]
Initial Cost
Land	3,411
Building and Land Improvements	24,917
Costs Capitalized Subsequent to Acquisition	204
Gross Amounts Carried At Close of Period
Land	3,411
Building and Land Improvements	25,121
Total	28,532
Accumulated Depreciation	(6,957)
306 Sentinel Drive [Member]
Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	3,260
Building and Land Improvements	22,592
Costs Capitalized Subsequent to Acquisition	829
Gross Amounts Carried At Close of Period
Land	3,260
Building and Land Improvements	23,421
Total	26,681
Accumulated Depreciation	(5,934)
308 Sentinel Drive [Member]
Initial Cost
Land	1,422
Building and Land Improvements	26,208
Costs Capitalized Subsequent to Acquisition	68
Gross Amounts Carried At Close of Period
Land	1,422
Building and Land Improvements	26,276
Total	27,698
Accumulated Depreciation	(3,710)
310 Sentinel Way [Member]
Initial Cost
Land	2,372
Building and Land Improvements	37,069
Gross Amounts Carried At Close of Period
Land	2,372
Building and Land Improvements	37,069
Total	39,441
Accumulated Depreciation	(1,051)
310 The Bridge Street [Member]
Initial Cost
Land	261
Building and Land Improvements	26,531
Costs Capitalized Subsequent to Acquisition	2,865
Gross Amounts Carried At Close of Period
Land	261
Building and Land Improvements	29,396
Total	29,657
Accumulated Depreciation	(6,215)
312 Sentinel Way [Member]
Initial Cost
Land	3,138
Building and Land Improvements	27,799
Gross Amounts Carried At Close of Period
Land	3,138
Building and Land Improvements	27,799
Total	30,937
Accumulated Depreciation	(1,608)
3120 Fairview Park Drive [Member]
Initial Cost
Land	6,863
Building and Land Improvements	16,930
Costs Capitalized Subsequent to Acquisition	12,147
Gross Amounts Carried At Close of Period
Land	6,863
Building and Land Improvements	29,077
Total	35,940
Accumulated Depreciation	(3,321)
314 Sentinel Way [Member]
Initial Cost
Land	1,254
Building and Land Improvements	7,694
Gross Amounts Carried At Close of Period
Land	1,254
Building and Land Improvements	7,694
Total	8,948
Accumulated Depreciation	(316)
316 Sentinel Way [Member]
Initial Cost
Land	2,748
Building and Land Improvements	38,156
Costs Capitalized Subsequent to Acquisition	145
Gross Amounts Carried At Close of Period
Land	2,748
Building and Land Improvements	38,301
Total	41,049
Accumulated Depreciation	(4,538)
318 Sentinel Way [Member]
Initial Cost
Land	2,185
Building and Land Improvements	28,426
Gross Amounts Carried At Close of Period
Land	2,185
Building and Land Improvements	28,426
Total	30,611
Accumulated Depreciation	(7,691)
320 Sentinel Way [Member]
Initial Cost
Land	2,067
Building and Land Improvements	21,623
Gross Amounts Carried At Close of Period
Land	2,067
Building and Land Improvements	21,623
Total	23,690
Accumulated Depreciation	(4,851)
322 Sentinel Way [Member]
Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	2,605
Building and Land Improvements	22,827
Gross Amounts Carried At Close of Period
Land	2,605
Building and Land Improvements	22,827
Total	25,432
Accumulated Depreciation	(5,714)
324 Sentinel Way [Member]
Initial Cost
Land	1,656
Building and Land Improvements	23,018
Gross Amounts Carried At Close of Period
Land	1,656
Building and Land Improvements	23,018
Total	24,674
Accumulated Depreciation	(3,654)
410 National Business Parkway [Member]
Initial Cost
Land	1,831
Building and Land Improvements	23,257
Costs Capitalized Subsequent to Acquisition	121
Gross Amounts Carried At Close of Period
Land	1,831
Building and Land Improvements	23,378
Total	25,209
Accumulated Depreciation	(2,311)
420 National Business Parkway [Member]
Initial Cost
Land	2,370
Building and Land Improvements	27,650
Costs Capitalized Subsequent to Acquisition	110
Gross Amounts Carried At Close of Period
Land	2,370
Building and Land Improvements	27,760
Total	30,130
Accumulated Depreciation	(1,931)
430 National Business Parkway [Member]
Initial Cost
Land	1,852
Building and Land Improvements	21,299
Costs Capitalized Subsequent to Acquisition	161
Gross Amounts Carried At Close of Period
Land	1,852
Building and Land Improvements	21,460
Total	23,312
Accumulated Depreciation	(2,580)
44408 Pecan Court [Member]
Initial Cost
Land	817
Building and Land Improvements	1,583
Costs Capitalized Subsequent to Acquisition	581
Gross Amounts Carried At Close of Period
Land	817
Building and Land Improvements	2,164
Total	2,981
Accumulated Depreciation	(699)
44414 Pecan Court [Member]
Initial Cost
Land	405
Building and Land Improvements	1,619
Costs Capitalized Subsequent to Acquisition	341
Gross Amounts Carried At Close of Period
Land	405
Building and Land Improvements	1,960
Total	2,365
Accumulated Depreciation	(808)
44417 Pecan Court [Member]
Initial Cost
Land	434
Building and Land Improvements	3,348
Costs Capitalized Subsequent to Acquisition	88
Gross Amounts Carried At Close of Period
Land	434
Building and Land Improvements	3,436
Total	3,870
Accumulated Depreciation	(1,277)
44420 Pecan Court [Member]
Initial Cost
Land	344
Building and Land Improvements	890
Costs Capitalized Subsequent to Acquisition	168
Gross Amounts Carried At Close of Period
Land	344
Building and Land Improvements	1,058
Total	1,402
Accumulated Depreciation	(311)
44425 Pecan Court [Member]
Initial Cost
Land	1,309
Building and Land Improvements	3,506
Costs Capitalized Subsequent to Acquisition	1,671
Gross Amounts Carried At Close of Period
Land	1,309
Building and Land Improvements	5,177
Total	6,486
Accumulated Depreciation	(2,090)
45310 Abell House Lane [Member]
Initial Cost
Land	2,272
Building and Land Improvements	13,808
Gross Amounts Carried At Close of Period
Land	2,272
Building and Land Improvements	13,808
Total	16,080
Accumulated Depreciation	(1,748)
46579 Expedition Drive [Member]
Initial Cost
Land	1,406
Building and Land Improvements	5,796
Costs Capitalized Subsequent to Acquisition	1,409
Gross Amounts Carried At Close of Period
Land	1,406
Building and Land Improvements	7,205
Total	8,611
Accumulated Depreciation	(3,229)
46591 Expedition Drive [Member]
Initial Cost
Land	1,200
Building and Land Improvements	7,199
Costs Capitalized Subsequent to Acquisition	1,236
Gross Amounts Carried At Close of Period
Land	1,200
Building and Land Improvements	8,435
Total	9,635
Accumulated Depreciation	(2,289)
4851 Stonecroft Boulevard [Member]
Initial Cost
Land	1,878
Building and Land Improvements	11,558
Costs Capitalized Subsequent to Acquisition	21
Gross Amounts Carried At Close of Period
Land	1,878
Building and Land Improvements	11,579
Total	13,457
Accumulated Depreciation	(3,538)
5325 Nottingham Drive [Member]
Initial Cost
Land	816
Building and Land Improvements	2,994
Costs Capitalized Subsequent to Acquisition	485
Gross Amounts Carried At Close of Period
Land	816
Building and Land Improvements	3,479
Total	4,295
Accumulated Depreciation	(370)
5355 Nottingham Drive [Member]
Initial Cost
Land	761
Building and Land Improvements	2,281
Costs Capitalized Subsequent to Acquisition	1,917
Gross Amounts Carried At Close of Period
Land	761
Building and Land Improvements	4,198
Total	4,959
Accumulated Depreciation	(1,445)
540 National Business Parkway [Member]
Initial Cost
Land	2,035
Building and Land Improvements	26,273
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried At Close of Period
Land	2,035
Building and Land Improvements	26,273
Total	28,308
Accumulated Depreciation	0
5520 Research Park Drive [Member]
Initial Cost
Building and Land Improvements	20,072
Costs Capitalized Subsequent to Acquisition	287
Gross Amounts Carried At Close of Period
Building and Land Improvements	20,359
Total	20,359
Accumulated Depreciation	(3,716)
5522 Research Park Drive [Member]
Initial Cost
Building and Land Improvements	4,550
Gross Amounts Carried At Close of Period
Building and Land Improvements	4,550
Total	4,550
Accumulated Depreciation	(1,069)
5801 University Research Court [Member]
Initial Cost
Building and Land Improvements	1,964
Gross Amounts Carried At Close of Period
Building and Land Improvements	1,964
Total	1,964
Accumulated Depreciation	0
5825 University Research Court [Member]
Real Estate and Accumulated Depreciation
Encumbrances	21,677
Initial Cost
Building and Land Improvements	22,740
Costs Capitalized Subsequent to Acquisition	126
Gross Amounts Carried At Close of Period
Building and Land Improvements	22,866
Total	22,866
Accumulated Depreciation	(4,413)
5850 University Research Court [Member]
Real Estate and Accumulated Depreciation
Encumbrances	22,933
Initial Cost
Building and Land Improvements	31,906
Costs Capitalized Subsequent to Acquisition	405
Gross Amounts Carried At Close of Period
Building and Land Improvements	32,311
Total	32,311
Accumulated Depreciation	(5,446)
6700 Alexander Bell Drive [Member]
Initial Cost
Land	1,755
Building and Land Improvements	6,951
Costs Capitalized Subsequent to Acquisition	6,490
Gross Amounts Carried At Close of Period
Land	1,755
Building and Land Improvements	13,441
Total	15,196
Accumulated Depreciation	(6,373)
6708 Alexander Bell Drive [Member]
Initial Cost
Land	897
Building and Land Improvements	8,975
Costs Capitalized Subsequent to Acquisition	1,605
Gross Amounts Carried At Close of Period
Land	897
Building and Land Improvements	10,580
Total	11,477
Accumulated Depreciation	(3,612)
6711 Columbia Gateway Drive [Member]
Initial Cost
Land	2,683
Building and Land Improvements	23,240
Costs Capitalized Subsequent to Acquisition	1,032
Gross Amounts Carried At Close of Period
Land	2,683
Building and Land Improvements	24,272
Total	26,955
Accumulated Depreciation	(6,070)
6716 Alexander Bell Drive [Member]
Initial Cost
Land	1,242
Building and Land Improvements	4,973
Costs Capitalized Subsequent to Acquisition	3,707
Gross Amounts Carried At Close of Period
Land	1,242
Building and Land Improvements	8,680
Total	9,922
Accumulated Depreciation	(4,743)
6721 Columbia Gateway Drive [Member]
Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	1,753
Building and Land Improvements	34,090
Costs Capitalized Subsequent to Acquisition	85
Gross Amounts Carried At Close of Period
Land	1,753
Building and Land Improvements	34,175
Total	35,928
Accumulated Depreciation	(6,655)
6724 Alexander Bell Drive [Member]
Initial Cost
Land	449
Building and Land Improvements	5,039
Costs Capitalized Subsequent to Acquisition	1,190
Gross Amounts Carried At Close of Period
Land	449
Building and Land Improvements	6,229
Total	6,678
Accumulated Depreciation	(2,426)
6731 Columbia Gateway Drive [Member]
Initial Cost
Land	2,807
Building and Land Improvements	19,098
Costs Capitalized Subsequent to Acquisition	3,002
Gross Amounts Carried At Close of Period
Land	2,807
Building and Land Improvements	22,100
Total	24,907
Accumulated Depreciation	(9,285)
6740 Alexander Bell Drive [Member]
Initial Cost
Land	1,424
Building and Land Improvements	5,696
Costs Capitalized Subsequent to Acquisition	3,305
Gross Amounts Carried At Close of Period
Land	1,424
Building and Land Improvements	9,001
Total	10,425
Accumulated Depreciation	(5,405)
6741 Columbia Gateway Drive [Member]
Initial Cost
Land	675
Building and Land Improvements	1,711
Costs Capitalized Subsequent to Acquisition	124
Gross Amounts Carried At Close of Period
Land	675
Building and Land Improvements	1,835
Total	2,510
Accumulated Depreciation	(411)
6750 Alexander Bell Drive [Member]
Initial Cost
Land	1,263
Building and Land Improvements	12,461
Costs Capitalized Subsequent to Acquisition	3,622
Gross Amounts Carried At Close of Period
Land	1,263
Building and Land Improvements	16,083
Total	17,346
Accumulated Depreciation	(8,151)
6760 Alexander Bell Drive [Member]
Initial Cost
Land	890
Building and Land Improvements	3,561
Costs Capitalized Subsequent to Acquisition	3,155
Gross Amounts Carried At Close of Period
Land	890
Building and Land Improvements	6,716
Total	7,606
Accumulated Depreciation	(3,560)
6940 Columbia Gateway Drive [Member]
Initial Cost
Land	3,545
Building and Land Improvements	9,917
Costs Capitalized Subsequent to Acquisition	5,877
Gross Amounts Carried At Close of Period
Land	3,545
Building and Land Improvements	15,794
Total	19,339
Accumulated Depreciation	(7,558)
6950 Columbia Gateway Drive [Member]
Initial Cost
Land	3,596
Building and Land Improvements	14,269
Costs Capitalized Subsequent to Acquisition	3,220
Gross Amounts Carried At Close of Period
Land	3,596
Building and Land Improvements	17,489
Total	21,085
Accumulated Depreciation	(8,096)
7000 Columbia Gateway Drive [Member]
Initial Cost
Land	3,131
Building and Land Improvements	12,103
Costs Capitalized Subsequent to Acquisition	5,205
Gross Amounts Carried At Close of Period
Land	3,131
Building and Land Improvements	17,308
Total	20,439
Accumulated Depreciation	(5,280)
7005 Columbia Gateway Drive [Member]
Initial Cost
Land	3,036
Building and Land Improvements	424
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried At Close of Period
Land	3,036
Building and Land Improvements	424
Total	3,460
Accumulated Depreciation	0
7015 Albert Einstein Drive [Member]
Real Estate and Accumulated Depreciation
Encumbrances	1,214
Initial Cost
Land	2,058
Building and Land Improvements	6,093
Costs Capitalized Subsequent to Acquisition	1,993
Gross Amounts Carried At Close of Period
Land	2,058
Building and Land Improvements	8,086
Total	10,144
Accumulated Depreciation	(3,142)
7061 Columbia Gateway Drive [Member]
Initial Cost
Land	729
Building and Land Improvements	3,094
Costs Capitalized Subsequent to Acquisition	2,018
Gross Amounts Carried At Close of Period
Land	729
Building and Land Improvements	5,112
Total	5,841
Accumulated Depreciation	(1,971)
7063 Columbia Gateway Drive [Member]
Initial Cost
Land	902
Building and Land Improvements	3,684
Costs Capitalized Subsequent to Acquisition	2,449
Gross Amounts Carried At Close of Period
Land	902
Building and Land Improvements	6,133
Total	7,035
Accumulated Depreciation	(2,760)
7065 Columbia Gateway Drive [Member]
Initial Cost
Land	919
Building and Land Improvements	3,763
Costs Capitalized Subsequent to Acquisition	3,095
Gross Amounts Carried At Close of Period
Land	919
Building and Land Improvements	6,858
Total	7,777
Accumulated Depreciation	(3,205)
7067 Columbia Gateway Drive [Member]
Initial Cost
Land	1,829
Building and Land Improvements	11,823
Costs Capitalized Subsequent to Acquisition	2,975
Gross Amounts Carried At Close of Period
Land	1,829
Building and Land Improvements	14,798
Total	16,627
Accumulated Depreciation	(6,605)
7125 Columbia Gateway Drive [Member]
Initial Cost
Land	3,361
Building and Land Improvements	2,207
Costs Capitalized Subsequent to Acquisition	279
Gross Amounts Carried At Close of Period
Land	3,361
Building and Land Improvements	2,486
Total	5,847
7125 Columbia Gateway Drive [Member]
Initial Cost
Land	17,126
Building and Land Improvements	46,994
Costs Capitalized Subsequent to Acquisition	11,442
Gross Amounts Carried At Close of Period
Land	17,126
Building and Land Improvements	58,436
Total	75,562
Accumulated Depreciation	(18,673)
7130 Columbia Gateway Drive [Member]
Initial Cost
Land	1,350
Building and Land Improvements	4,359
Costs Capitalized Subsequent to Acquisition	2,232
Gross Amounts Carried At Close of Period
Land	1,350
Building and Land Improvements	6,591
Total	7,941
Accumulated Depreciation	(3,009)
7134 Columbia Gateway Drive [Member]
Initial Cost
Land	704
Building and Land Improvements	4,128
Costs Capitalized Subsequent to Acquisition	327
Gross Amounts Carried At Close of Period
Land	704
Building and Land Improvements	4,455
Total	5,159
Accumulated Depreciation	(1,317)
7138 Columbia Gateway Drive [Member]
Initial Cost
Land	1,104
Building and Land Improvements	3,518
Costs Capitalized Subsequent to Acquisition	2,448
Gross Amounts Carried At Close of Period
Land	1,104
Building and Land Improvements	5,966
Total	7,070
Accumulated Depreciation	(3,292)
7142 Columbia Gateway Drive [Member]
Initial Cost
Land	1,342
Building and Land Improvements	3,978
Costs Capitalized Subsequent to Acquisition	2,608
Gross Amounts Carried At Close of Period
Land	1,342
Building and Land Improvements	6,586
Total	7,928
Accumulated Depreciation	(2,556)
7150 Columbia Gateway Drive [Member]
Initial Cost
Land	1,032
Building and Land Improvements	3,429
Costs Capitalized Subsequent to Acquisition	783
Gross Amounts Carried At Close of Period
Land	1,032
Building and Land Improvements	4,212
Total	5,244
Accumulated Depreciation	(1,301)
7150 Riverwood Drive [Member]
Initial Cost
Land	1,821
Building and Land Improvements	4,388
Costs Capitalized Subsequent to Acquisition	1,727
Gross Amounts Carried At Close of Period
Land	1,821
Building and Land Improvements	6,115
Total	7,936
Accumulated Depreciation	(2,118)
7160 Riverwood Drive [Member]
Initial Cost
Land	2,732
Building and Land Improvements	7,006
Costs Capitalized Subsequent to Acquisition	2,296
Gross Amounts Carried At Close of Period
Land	2,732
Building and Land Improvements	9,302
Total	12,034
Accumulated Depreciation	(3,521)
7170 Riverwood Drive [Member]
Initial Cost
Land	1,283
Building and Land Improvements	3,096
Costs Capitalized Subsequent to Acquisition	1,315
Gross Amounts Carried At Close of Period
Land	1,283
Building and Land Improvements	4,411
Total	5,694
Accumulated Depreciation	(1,558)
7175 Riverwood Drive [Member]
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	(571)
7200 Redstone Gateway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	6,479
Initial Cost
Land	0
Building and Land Improvements	8,348
Costs Capitalized Subsequent to Acquisition	5
Gross Amounts Carried At Close of Period
Land	0
Building and Land Improvements	8,353
Total	8,353
Accumulated Depreciation	(540)
7200 Riverwood Road [Member]
Initial Cost
Land	4,089
Building and Land Improvements	22,389
Costs Capitalized Subsequent to Acquisition	4,675
Gross Amounts Carried At Close of Period
Land	4,089
Building and Land Improvements	27,064
Total	31,153
Accumulated Depreciation	(9,338)
7205 Riverwood Drive [Member]
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	(1,845)
7272 Park Circle Drive [Member]
Real Estate and Accumulated Depreciation
Encumbrances	0
Initial Cost
Land	1,479
Building and Land Improvements	6,300
Costs Capitalized Subsequent to Acquisition	4,132
Gross Amounts Carried At Close of Period
Land	1,479
Building and Land Improvements	10,432
Total	11,911
Accumulated Depreciation	(3,412)
7318 Parkway Drive [Member]
Initial Cost
Land	972
Building and Land Improvements	3,888
Costs Capitalized Subsequent to Acquisition	1,224
Gross Amounts Carried At Close of Period
Land	972
Building and Land Improvements	5,112
Total	6,084
Accumulated Depreciation	(2,234)
7320 Parkway Drive [Member]
Initial Cost
Land	905
Building and Land Improvements	1,444
Costs Capitalized Subsequent to Acquisition	5,037
Gross Amounts Carried At Close of Period
Land	905
Building and Land Improvements	6,481
Total	7,386
Accumulated Depreciation	(1,302)
7400 Redstone Gateway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	7,107
Initial Cost
Land	0
Building and Land Improvements	9,223
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried At Close of Period
Land	0
Building and Land Improvements	9,223
Total	9,223
Accumulated Depreciation	(351)
7467 Ridge Road [Member]
Initial Cost
Land	1,629
Building and Land Improvements	3,052
Costs Capitalized Subsequent to Acquisition	4,136
Gross Amounts Carried At Close of Period
Land	1,629
Building and Land Improvements	7,188
Total	8,817
Accumulated Depreciation	(1,424)
7740 Milestone Parkway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	18,604
Initial Cost
Land	3,825
Building and Land Improvements	34,177
Costs Capitalized Subsequent to Acquisition	430
Gross Amounts Carried At Close of Period
Land	3,825
Building and Land Improvements	34,607
Total	38,432
Accumulated Depreciation	(5,572)
7770 Backlick Road [Member]
Initial Cost
Land	6,387
Building and Land Improvements	75,268
Costs Capitalized Subsequent to Acquisition	142
Gross Amounts Carried At Close of Period
Land	6,387
Building and Land Improvements	75,410
Total	81,797
Accumulated Depreciation	(7,171)
7880 Milestone Parkway [Member]
Initial Cost
Land	4,857
Building and Land Improvements	24,419
Costs Capitalized Subsequent to Acquisition	63
Gross Amounts Carried At Close of Period
Land	4,857
Building and Land Improvements	24,482
Total	29,339
Accumulated Depreciation	(764)
8010 Corporate Drive [Member]
Initial Cost
Land	1,349
Building and Land Improvements	1,523
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried At Close of Period
Land	1,349
Building and Land Improvements	1,523
Total	2,872
Accumulated Depreciation	(572)
8020 Corporate Drive [Member]
Initial Cost
Land	2,184
Building and Land Improvements	1,057
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried At Close of Period
Land	2,184
Building and Land Improvements	1,057
Total	3,241
Accumulated Depreciation	(684)
8094 Sandpiper Circle [Member]
Initial Cost
Land	1,960
Building and Land Improvements	2,288
Costs Capitalized Subsequent to Acquisition	1,131
Gross Amounts Carried At Close of Period
Land	1,960
Building and Land Improvements	3,419
Total	5,379
Accumulated Depreciation	(331)
8098 Sandpiper Circle [Member]
Initial Cost
Land	1,797
Building and Land Improvements	1,417
Costs Capitalized Subsequent to Acquisition	639
Gross Amounts Carried At Close of Period
Land	1,797
Building and Land Improvements	2,056
Total	3,853
Accumulated Depreciation	0
8110 Corporate Drive [Member]
Initial Cost
Land	2,285
Building and Land Improvements	5,351
Costs Capitalized Subsequent to Acquisition	989
Gross Amounts Carried At Close of Period
Land	2,285
Building and Land Improvements	6,340
Total	8,625
Accumulated Depreciation	(757)
8140 Corporate Drive [Member]
Initial Cost
Land	2,158
Building and Land Improvements	6,394
Costs Capitalized Subsequent to Acquisition	3,760
Gross Amounts Carried At Close of Period
Land	2,158
Building and Land Improvements	10,154
Total	12,312
Accumulated Depreciation	(2,085)
8621 Robert Fulton Drive [Member]
Initial Cost
Land	2,317
Building and Land Improvements	12,642
Costs Capitalized Subsequent to Acquisition	355
Gross Amounts Carried At Close of Period
Land	2,317
Building and Land Improvements	12,997
Total	15,314
Accumulated Depreciation	(3,740)
8661 Robert Fulton Drive [Member]
Initial Cost
Land	1,510
Building and Land Improvements	3,764
Costs Capitalized Subsequent to Acquisition	2,427
Gross Amounts Carried At Close of Period
Land	1,510
Building and Land Improvements	6,191
Total	7,701
Accumulated Depreciation	(2,386)
8671 Robert Fulton Drive [Member]
Initial Cost
Land	1,718
Building and Land Improvements	4,280
Costs Capitalized Subsequent to Acquisition	4,052
Gross Amounts Carried At Close of Period
Land	1,718
Building and Land Improvements	8,332
Total	10,050
Accumulated Depreciation	(3,354)
870 Elkridge Landing Road [Member]
Initial Cost
Land	2,003
Building and Land Improvements	9,442
Costs Capitalized Subsequent to Acquisition	7,611
Gross Amounts Carried At Close of Period
Land	2,003
Building and Land Improvements	17,053
Total	19,056
Accumulated Depreciation	(8,888)
891 Elkridge Landing Road [Member]
Initial Cost
Land	1,165
Building and Land Improvements	4,772
Costs Capitalized Subsequent to Acquisition	2,948
Gross Amounts Carried At Close of Period
Land	1,165
Building and Land Improvements	7,720
Total	8,885
Accumulated Depreciation	(3,806)
901 Elkridge Landing Road [Member]
Initial Cost
Land	1,156
Building and Land Improvements	4,437
Costs Capitalized Subsequent to Acquisition	2,386
Gross Amounts Carried At Close of Period
Land	1,156
Building and Land Improvements	6,823
Total	7,979
Accumulated Depreciation	(3,319)
911 Elkridge Landing Road [Member]
Initial Cost
Land	1,215
Building and Land Improvements	4,861
Costs Capitalized Subsequent to Acquisition	2,043
Gross Amounts Carried At Close of Period
Land	1,215
Building and Land Improvements	6,904
Total	8,119
Accumulated Depreciation	(3,679)
938 Elkridge Landing Road [Member]
Initial Cost
Land	922
Building and Land Improvements	4,748
Costs Capitalized Subsequent to Acquisition	1,469
Gross Amounts Carried At Close of Period
Land	922
Building and Land Improvements	6,217
Total	7,139
Accumulated Depreciation	(2,338)
939 Elkridge Landing Road [Member]
Initial Cost
Land	939
Building and Land Improvements	3,756
Costs Capitalized Subsequent to Acquisition	4,437
Gross Amounts Carried At Close of Period
Land	939
Building and Land Improvements	8,193
Total	9,132
Accumulated Depreciation	(3,797)
940 Elkridge Landing Road [Member]
Initial Cost
Land	842
Building and Land Improvements	4
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried At Close of Period
Land	842
Building and Land Improvements	4
Total	846
Accumulated Depreciation	0
9651 Hornbaker Road [Member]
Initial Cost
Land	6,050
Building and Land Improvements	249,074
Costs Capitalized Subsequent to Acquisition	1,140
Gross Amounts Carried At Close of Period
Land	6,050
Building and Land Improvements	250,214
Total	256,264
Accumulated Depreciation	(28,553)
Arundel Preserve [Member]
Initial Cost
Land	13,401
Building and Land Improvements	9,565
Gross Amounts Carried At Close of Period
Land	13,401
Building and Land Improvements	9,565
Total	22,966
Bethlehem Technology Park-DC18 [Member]
Initial Cost
Land	3,599
Building and Land Improvements	4,301
Gross Amounts Carried At Close of Period
Land	3,599
Building and Land Improvements	4,301
Total	7,900
Bethlehem Technology Park-DC19 [Member]
Initial Cost
Land	3,708
Building and Land Improvements	17,504
Gross Amounts Carried At Close of Period
Land	3,708
Building and Land Improvements	17,504
Total	21,212
Accumulated Depreciation	(34)
Bethlehem Technology Park-DC20 [Member]
Initial Cost
Land	3,599
Building and Land Improvements	12,217
Gross Amounts Carried At Close of Period
Land	3,599
Building and Land Improvements	12,217
Total	15,816
Canton Crossing Land [Member]
Initial Cost
Land	16,085
Building and Land Improvements	2,381
Gross Amounts Carried At Close of Period
Land	16,085
Building and Land Improvements	2,381
Total	18,466
Canton Crossing Util Distr Ctr [Member]
Initial Cost
Land	7,300
Building and Land Improvements	15,556
Costs Capitalized Subsequent to Acquisition	986
Gross Amounts Carried At Close of Period
Land	7,300
Building and Land Improvements	16,542
Total	23,842
Accumulated Depreciation	(3,900)
Columbia Gateway - Southridge [Member]
Initial Cost
Land	6,387
Building and Land Improvements	3,659
Gross Amounts Carried At Close of Period
Land	6,387
Building and Land Improvements	3,659
Total	10,046
Dahlgren Technology Center [Member]
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 [Member]
Initial Cost
Land	705
Building and Land Improvements	729
Gross Amounts Carried At Close of Period
Land	705
Building and Land Improvements	729
Total	1,434
Innovation Park [Member]
Initial Cost
Land	4,443
Building and Land Improvements	94
Gross Amounts Carried At Close of Period
Land	4,443
Building and Land Improvements	94
Total	4,537
M Square Research Park [Member]
Initial Cost
Building and Land Improvements	2,581
Gross Amounts Carried At Close of Period
Building and Land Improvements	2,581
Total	2,581
National Business Park North [Member]
Initial Cost
Land	28,066
Building and Land Improvements	44,579
Gross Amounts Carried At Close of Period
Land	28,066
Building and Land Improvements	44,579
Total	72,645
North Gate Business Park [Member]
Initial Cost
Land	4,212
Building and Land Improvements	2,198
Gross Amounts Carried At Close of Period
Land	4,212
Building and Land Improvements	2,198
Total	6,410
Northwest Crossroads [Member]
Initial Cost
Land	7,430
Building and Land Improvements	847
Gross Amounts Carried At Close of Period
Land	7,430
Building and Land Improvements	847
Total	8,277
NOVA Office A [Member]
Initial Cost
Land	2,096
Building and Land Improvements	46,800
Gross Amounts Carried At Close of Period
Land	2,096
Building and Land Improvements	46,800
Total	48,896
Accumulated Depreciation	(2,230)
NOVA Office B [Member]
Initial Cost
Land	739
Building and Land Improvements	27,112
Gross Amounts Carried At Close of Period
Land	739
Building and Land Improvements	27,112
Total	27,851
Accumulated Depreciation	(450)
NOVA Office D [Member]
Initial Cost
Land	6,587
Building and Land Improvements	10,985
Gross Amounts Carried At Close of Period
Land	6,587
Building and Land Improvements	10,985
Total	17,572
Old Annapolis Road [Member]
Initial Cost
Land	1,637
Building and Land Improvements	5,500
Costs Capitalized Subsequent to Acquisition	4,872
Gross Amounts Carried At Close of Period
Land	1,637
Building and Land Improvements	10,372
Total	12,009
Accumulated Depreciation	(3,237)
Patriot Point - DC15 [Member]
Initial Cost
Land	12,156
Building and Land Improvements	16,844
Gross Amounts Carried At Close of Period
Land	12,156
Building and Land Improvements	16,844
Total	29,000
Accumulated Depreciation	(328)
Patriot Point - DC16 [Member]
Initial Cost
Land	12,156
Building and Land Improvements	16,556
Gross Amounts Carried At Close of Period
Land	12,156
Building and Land Improvements	16,556
Total	28,712
Accumulated Depreciation	(289)
Patriot Point - DC17 [Member]
Initial Cost
Land	6,078
Building and Land Improvements	15,971
Gross Amounts Carried At Close of Period
Land	6,078
Building and Land Improvements	15,971
Total	22,049
Accumulated Depreciation	(117)
Patriot Ridge [Member]
Initial Cost
Land	18,517
Building and Land Improvements	14,461
Gross Amounts Carried At Close of Period
Land	18,517
Building and Land Improvements	14,461
Total	32,978
Redstone Gateway [Member]
Initial Cost
Building and Land Improvements	18,364
Gross Amounts Carried At Close of Period
Building and Land Improvements	18,364
Total	18,364
Route 15/Biggs Ford Road [Member]
Initial Cost
Land	1,129
Building and Land Improvements	0
Gross Amounts Carried At Close of Period
Land	1,129
Building and Land Improvements	0
Total	1,129
Sentry Gateway [Member]
Initial Cost
Land	8,275
Building and Land Improvements	3,645
Gross Amounts Carried At Close of Period
Land	8,275
Building and Land Improvements	3,645
Total	11,920
Sentry Gateway - T [Member]
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	(9,590)
Sentry Gateway - V [Member]
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	(215)
Sentry Gateway - W [Member]
Initial Cost
Building and Land Improvements	1,884
Gross Amounts Carried At Close of Period
Building and Land Improvements	1,884
Total	1,884
Accumulated Depreciation	(343)
Sentry Gateway - X [Member]
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	(3,257)
Sentry Gateway - Y [Member]
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	(3,277)
Sentry Gateway - Z [Member]
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	(1,379)
Westfields - Park Center [Member]
Initial Cost
Land	16,418
Building and Land Improvements	18,319
Gross Amounts Carried At Close of Period
Land	16,418
Building and Land Improvements	18,319
Total	34,737
Westfields Corporate Center [Member]
Initial Cost
Land	7,141
Building and Land Improvements	1,432
Gross Amounts Carried At Close of Period
Land	7,141
Building and Land Improvements	1,432
Total	8,573
White Marsh [Member]
Initial Cost
Land	3,461
Building and Land Improvements	309
Gross Amounts Carried At Close of Period
Land	3,461
Building and Land Improvements	309
Total	3,770
Woodland Park [Member]
Initial Cost
Land	9,614
Building and Land Improvements	108
Gross Amounts Carried At Close of Period
Land	9,614
Building and Land Improvements	108
Total	9,722
Other Developments, including intercompany eliminations [Member]
Initial Cost
Land	7
Building and Land Improvements	314
Costs Capitalized Subsequent to Acquisition	252
Gross Amounts Carried At Close of Period
Land	7
Building and Land Improvements	566
Total	573
Accumulated Depreciation	(48)
Fair value measurement on a nonrecurring basis [Member] | Real Estate Held [Member]
Additional information
Impairment losses	78,600
Fair value measurement on a nonrecurring basis [Member] | Real Estate Investment Properties, Net [Member]
Additional information
Impairment losses	$ 101,400