| Schedule III-Real Estate and Accumulated Depreciation | 
Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries 
Schedule III—Real Estate and Accumulated Depreciation 
December 31, 2016 
 
(Dollars in thousands)  
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   | 
   | 
   | 
Initial Cost  | 
   | 
Gross Amounts Carried                     At Close of Period  | 
   | 
   | 
   | 
 
Property (Type) (1)  | 
Location  | 
Encumbrances (2)  | 
Land  | 
Building     and Land Improvements  | 
Costs Capitalized Subsequent to Acquisition  | 
Land  | 
Building      and Land Improvements  | 
Total       (3)(4)  | 
Accumulated Depreciation (5)  | 
Year Built or Renovated  | 
Date Acquired (6)  | 
 
100 Light Street (O)  | 
Baltimore, MD  | 
$  | 
50,244  | 
 
  | 
$  | 
26,715  | 
 
  | 
$  | 
58,343  | 
 
  | 
$  | 
2,388  | 
 
  | 
$  | 
26,715  | 
 
  | 
$  | 
60,731  | 
 
  | 
$  | 
87,446  | 
 
  | 
$  | 
(5,353  | 
)  | 
1973  | 
8/7/2015  | 
 
1000 Redstone Gateway (O)  | 
Huntsville, AL  | 
11,057  | 
 
  | 
—  | 
 
  | 
20,533  | 
 
  | 
5  | 
 
  | 
—  | 
 
  | 
20,538  | 
 
  | 
20,538  | 
 
  | 
(1,951  | 
)  | 
2013  | 
3/23/2010  | 
 
1100 Redstone Gateway (O)  | 
Huntsville, AL  | 
11,513  | 
 
  | 
—  | 
 
  | 
19,593  | 
 
  | 
—  | 
 
  | 
—  | 
 
  | 
19,593  | 
 
  | 
19,593  | 
 
  | 
(1,455  | 
)  | 
2014  | 
3/23/2010  | 
 
114 National Business Parkway (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
364  | 
 
  | 
3,109  | 
 
  | 
117  | 
 
  | 
364  | 
 
  | 
3,226  | 
 
  | 
3,590  | 
 
  | 
(1,213  | 
)  | 
2002  | 
6/30/2000  | 
 
11751 Meadowville Lane (O)  | 
Richmond, VA  | 
—  | 
 
  | 
1,305  | 
 
  | 
52,098  | 
 
  | 
112  | 
 
  | 
1,305  | 
 
  | 
52,210  | 
 
  | 
53,515  | 
 
  | 
(12,636  | 
)  | 
2007  | 
9/15/2006  | 
 
1200 Redstone Gateway (O)  | 
Huntsville, AL  | 
13,313  | 
 
  | 
—  | 
 
  | 
22,389  | 
 
  | 
—  | 
 
  | 
—  | 
 
  | 
22,389  | 
 
  | 
22,389  | 
 
  | 
(1,705  | 
)  | 
2013  | 
3/23/2010  | 
 
1201 M Street (O)  | 
Washington, DC  | 
—  | 
 
  | 
—  | 
 
  | 
49,784  | 
 
  | 
6,916  | 
 
  | 
—  | 
 
  | 
56,700  | 
 
  | 
56,700  | 
 
  | 
(10,789  | 
)  | 
2001  | 
9/28/2010  | 
 
1201 Winterson Road (O)  | 
Linthicum, MD  | 
—  | 
 
  | 
1,288  | 
 
  | 
13,184  | 
 
  | 
460  | 
 
  | 
1,288  | 
 
  | 
13,644  | 
 
  | 
14,932  | 
 
  | 
(3,984  | 
)  | 
1985 (7)  | 
4/30/1998  | 
 
1220 12th Street, SE (O)  | 
Washington, DC  | 
—  | 
 
  | 
—  | 
 
  | 
42,464  | 
 
  | 
4,026  | 
 
  | 
—  | 
 
  | 
46,490  | 
 
  | 
46,490  | 
 
  | 
(10,005  | 
)  | 
2003  | 
9/28/2010  | 
 
1243 Winterson Road (L)  | 
Linthicum, MD  | 
—  | 
 
  | 
630  | 
 
  | 
—  | 
 
  | 
—  | 
 
  | 
630  | 
 
  | 
—  | 
 
  | 
630  | 
 
  | 
—  | 
 
  | 
(8)  | 
12/19/2001  | 
 
131 National Business Parkway (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
1,906  | 
 
  | 
7,587  | 
 
  | 
3,593  | 
 
  | 
1,906  | 
 
  | 
11,180  | 
 
  | 
13,086  | 
 
  | 
(5,903  | 
)  | 
1990  | 
9/28/1998  | 
 
132 National Business Parkway (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
2,917  | 
 
  | 
12,259  | 
 
  | 
4,116  | 
 
  | 
2,917  | 
 
  | 
16,375  | 
 
  | 
19,292  | 
 
  | 
(8,121  | 
)  | 
2000  | 
5/28/1999  | 
 
133 National Business Parkway (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
2,517  | 
 
  | 
10,068  | 
 
  | 
5,238  | 
 
  | 
2,517  | 
 
  | 
15,306  | 
 
  | 
17,823  | 
 
  | 
(8,843  | 
)  | 
1997  | 
9/28/1998  | 
 
1334 Ashton Road (O)  | 
Hanover, MD  | 
—  | 
 
  | 
736  | 
 
  | 
1,488  | 
 
  | 
2,639  | 
 
  | 
736  | 
 
  | 
4,127  | 
 
  | 
4,863  | 
 
  | 
(2,598  | 
)  | 
1989  | 
4/28/1999  | 
 
134 National Business Parkway (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
3,684  | 
 
  | 
7,517  | 
 
  | 
3,693  | 
 
  | 
3,684  | 
 
  | 
11,210  | 
 
  | 
14,894  | 
 
  | 
(4,687  | 
)  | 
1999  | 
11/13/1998  | 
 
1340 Ashton Road (O)  | 
Hanover, MD  | 
—  | 
 
  | 
905  | 
 
  | 
3,620  | 
 
  | 
1,470  | 
 
  | 
905  | 
 
  | 
5,090  | 
 
  | 
5,995  | 
 
  | 
(2,738  | 
)  | 
1989  | 
4/28/1999  | 
 
13450 Sunrise Valley Road (O)  | 
Herndon, VA  | 
—  | 
 
  | 
1,386  | 
 
  | 
5,576  | 
 
  | 
4,553  | 
 
  | 
1,386  | 
 
  | 
10,129  | 
 
  | 
11,515  | 
 
  | 
(4,320  | 
)  | 
1998  | 
7/25/2003  | 
 
13454 Sunrise Valley Road (O)  | 
Herndon, VA  | 
—  | 
 
  | 
2,899  | 
 
  | 
11,986  | 
 
  | 
6,936  | 
 
  | 
2,899  | 
 
  | 
18,922  | 
 
  | 
21,821  | 
 
  | 
(8,111  | 
)  | 
1998  | 
7/25/2003  | 
 
135 National Business Parkway (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
2,484  | 
 
  | 
9,750  | 
 
  | 
5,991  | 
 
  | 
2,484  | 
 
  | 
15,741  | 
 
  | 
18,225  | 
 
  | 
(7,201  | 
)  | 
1998  | 
12/30/1998  | 
 
1362 Mellon Road (O)  | 
Hanover, MD  | 
—  | 
 
  | 
1,706  | 
 
  | 
3,108  | 
 
  | 
182  | 
 
  | 
1,706  | 
 
  | 
3,290  | 
 
  | 
4,996  | 
 
  | 
(31  | 
)  | 
2006  | 
2/10/2006  | 
 
13857 McLearen Road (O)  | 
Herndon, VA  | 
—  | 
 
  | 
3,507  | 
 
  | 
30,176  | 
 
  | 
1,603  | 
 
  | 
3,507  | 
 
  | 
31,779  | 
 
  | 
35,286  | 
 
  | 
(8,977  | 
)  | 
2007  | 
7/11/2012  | 
 
140 National Business Parkway (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
3,407  | 
 
  | 
24,167  | 
 
  | 
1,055  | 
 
  | 
3,407  | 
 
  | 
25,222  | 
 
  | 
28,629  | 
 
  | 
(8,263  | 
)  | 
2003  | 
12/31/2003  | 
 
141 National Business Parkway (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
2,398  | 
 
  | 
9,493  | 
 
  | 
4,008  | 
 
  | 
2,398  | 
 
  | 
13,501  | 
 
  | 
15,899  | 
 
  | 
(6,376  | 
)  | 
1990  | 
9/28/1998  | 
 
14280 Park Meadow Drive (O)  | 
Chantilly, VA  | 
—  | 
 
  | 
3,731  | 
 
  | 
15,953  | 
 
  | 
2,614  | 
 
  | 
3,731  | 
 
  | 
18,567  | 
 
  | 
22,298  | 
 
  | 
(6,740  | 
)  | 
1999  | 
9/29/2004  | 
 
1460 Dorsey Road (L)  | 
Hanover, MD  | 
—  | 
 
  | 
1,577  | 
 
  | 
—  | 
 
  | 
—  | 
 
  | 
1,577  | 
 
  | 
—  | 
 
  | 
1,577  | 
 
  | 
—  | 
 
  | 
(8)  | 
2/28/2006  | 
 
14840 Conference Center Drive (O)  | 
Chantilly, VA  | 
—  | 
 
  | 
1,572  | 
 
  | 
8,175  | 
 
  | 
2,853  | 
 
  | 
1,572  | 
 
  | 
11,028  | 
 
  | 
12,600  | 
 
  | 
(4,873  | 
)  | 
2000  | 
7/25/2003  | 
 
14850 Conference Center Drive (O)  | 
Chantilly, VA  | 
—  | 
 
  | 
1,615  | 
 
  | 
8,358  | 
 
  | 
2,945  | 
 
  | 
1,615  | 
 
  | 
11,303  | 
 
  | 
12,918  | 
 
  | 
(5,309  | 
)  | 
2000  | 
7/25/2003  | 
 
14900 Conference Center Drive (O)  | 
Chantilly, VA  | 
—  | 
 
  | 
3,436  | 
 
  | 
14,402  | 
 
  | 
5,997  | 
 
  | 
3,436  | 
 
  | 
20,399  | 
 
  | 
23,835  | 
 
  | 
(9,164  | 
)  | 
1999  | 
7/25/2003  | 
 
1501 South Clinton Street (O)  | 
Baltimore, MD  | 
—  | 
 
  | 
27,964  | 
 
  | 
51,990  | 
 
  | 
8,588  | 
 
  | 
27,964  | 
 
  | 
60,578  | 
 
  | 
88,542  | 
 
  | 
(17,440  | 
)  | 
2006  | 
10/27/2009  | 
 
15049 Conference Center Drive (O)  | 
Chantilly, VA  | 
—  | 
 
  | 
4,415  | 
 
  | 
20,365  | 
 
  | 
12,380  | 
 
  | 
4,415  | 
 
  | 
32,745  | 
 
  | 
37,160  | 
 
  | 
(10,220  | 
)  | 
1997  | 
8/14/2002  | 
 
15059 Conference Center Drive (O)  | 
Chantilly, VA  | 
—  | 
 
  | 
5,753  | 
 
  | 
13,615  | 
 
  | 
3,063  | 
 
  | 
5,753  | 
 
  | 
16,678  | 
 
  | 
22,431  | 
 
  | 
(7,218  | 
)  | 
2000  | 
8/14/2002  | 
 
1550 West Nursery Road (O)  | 
Linthicum, MD  | 
—  | 
 
  | 
14,071  | 
 
  | 
16,930  | 
 
  | 
—  | 
 
  | 
14,071  | 
 
  | 
16,930  | 
 
  | 
31,001  | 
 
  | 
(4,214  | 
)  | 
2009  | 
10/28/2009  | 
 
1560 West Nursery Road (O)  | 
Linthicum, MD  | 
—  | 
 
  | 
1,441  | 
 
  | 
113  | 
 
  | 
—  | 
 
  | 
1,441  | 
 
  | 
113  | 
 
  | 
1,554  | 
 
  | 
(7  | 
)  | 
2014  | 
10/28/2009  | 
 
1610 West Nursery Road (O)  | 
Linthicum, MD  | 
—  | 
 
  | 
259  | 
 
  | 
183  | 
 
  | 
—  | 
 
  | 
259  | 
 
  | 
183  | 
 
  | 
442  | 
 
  | 
—  | 
 
  | 
2016  | 
4/30/1998  | 
 
  
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   | 
   | 
   | 
Initial Cost  | 
   | 
Gross Amounts Carried                     At Close of Period  | 
   | 
   | 
   | 
 
Property (Type) (1)  | 
Location  | 
Encumbrances (2)  | 
Land  | 
Building     and Land Improvements  | 
Costs Capitalized Subsequent to Acquisition  | 
Land  | 
Building      and Land Improvements  | 
Total       (3)(4)  | 
Accumulated Depreciation (5)  | 
Year Built or Renovated  | 
Date Acquired (6)  | 
 
1616 West Nursery Road (O)  | 
Linthicum, MD  | 
—  | 
 
  | 
393  | 
 
  | 
1,659  | 
 
  | 
—  | 
 
  | 
393  | 
 
  | 
1,659  | 
 
  | 
2,052  | 
 
  | 
—  | 
 
  | 
(7)  | 
4/30/1998  | 
 
1622 West Nursery Road (O)  | 
Linthicum, MD  | 
—  | 
 
  | 
393  | 
 
  | 
3,159  | 
 
  | 
—  | 
 
  | 
393  | 
 
  | 
3,159  | 
 
  | 
3,552  | 
 
  | 
—  | 
 
  | 
2016 (7)  | 
4/30/1998  | 
 
16442 Commerce Drive (O)  | 
Dahlgren, VA  | 
—  | 
 
  | 
613  | 
 
  | 
2,582  | 
 
  | 
894  | 
 
  | 
613  | 
 
  | 
3,476  | 
 
  | 
4,089  | 
 
  | 
(1,442  | 
)  | 
2002  | 
12/21/2004  | 
 
16480 Commerce Drive (O)  | 
Dahlgren, VA  | 
—  | 
 
  | 
1,856  | 
 
  | 
7,425  | 
 
  | 
1,655  | 
 
  | 
1,856  | 
 
  | 
9,080  | 
 
  | 
10,936  | 
 
  | 
(2,768  | 
)  | 
2000  | 
12/28/2004  | 
 
16501 Commerce Drive (O)  | 
Dahlgren, VA  | 
—  | 
 
  | 
522  | 
 
  | 
2,090  | 
 
  | 
483  | 
 
  | 
522  | 
 
  | 
2,573  | 
 
  | 
3,095  | 
 
  | 
(882  | 
)  | 
2002  | 
12/21/2004  | 
 
16539 Commerce Drive (O)  | 
Dahlgren, VA  | 
—  | 
 
  | 
688  | 
 
  | 
2,859  | 
 
  | 
1,923  | 
 
  | 
688  | 
 
  | 
4,782  | 
 
  | 
5,470  | 
 
  | 
(2,161  | 
)  | 
1990  | 
12/21/2004  | 
 
16541 Commerce Drive (O)  | 
Dahlgren, VA  | 
—  | 
 
  | 
773  | 
 
  | 
3,093  | 
 
  | 
1,806  | 
 
  | 
773  | 
 
  | 
4,899  | 
 
  | 
5,672  | 
 
  | 
(1,865  | 
)  | 
1996  | 
12/21/2004  | 
 
16543 Commerce Drive (O)  | 
Dahlgren, VA  | 
—  | 
 
  | 
436  | 
 
  | 
1,742  | 
 
  | 
593  | 
 
  | 
436  | 
 
  | 
2,335  | 
 
  | 
2,771  | 
 
  | 
(696  | 
)  | 
2002  | 
12/21/2004  | 
 
1751 Pinnacle Drive (O)  | 
McLean, VA  | 
—  | 
 
  | 
10,486  | 
 
  | 
42,340  | 
 
  | 
24,774  | 
 
  | 
10,486  | 
 
  | 
67,114  | 
 
  | 
77,600  | 
 
  | 
(26,774  | 
)  | 
1989/1995  | 
9/23/2004  | 
 
1753 Pinnacle Drive (O)  | 
McLean, VA  | 
—  | 
 
  | 
8,275  | 
 
  | 
34,353  | 
 
  | 
11,219  | 
 
  | 
8,275  | 
 
  | 
45,572  | 
 
  | 
53,847  | 
 
  | 
(17,286  | 
)  | 
1976/2004  | 
9/23/2004  | 
 
201 Technology Drive (O)  | 
Lebanon, VA  | 
—  | 
 
  | 
726  | 
 
  | 
31,091  | 
 
  | 
60  | 
 
  | 
726  | 
 
  | 
31,151  | 
 
  | 
31,877  | 
 
  | 
(7,212  | 
)  | 
2007  | 
10/5/2007  | 
 
206 Research Boulevard (O)  | 
Aberdeen, MD  | 
—  | 
 
  | 
1,813  | 
 
  | 
1,287  | 
 
  | 
—  | 
 
  | 
1,813  | 
 
  | 
1,287  | 
 
  | 
3,100  | 
 
  | 
(18  | 
)  | 
2012  | 
9/14/2007  | 
 
209 Research Boulevard (O)  | 
Aberdeen, MD  | 
—  | 
 
  | 
1,045  | 
 
  | 
4,714  | 
 
  | 
175  | 
 
  | 
1,045  | 
 
  | 
4,889  | 
 
  | 
5,934  | 
 
  | 
(86  | 
)  | 
2010  | 
9/14/2007  | 
 
210 Research Boulevard (O)  | 
Aberdeen, MD  | 
—  | 
 
  | 
1,065  | 
 
  | 
2,593  | 
 
  | 
75  | 
 
  | 
1,065  | 
 
  | 
2,668  | 
 
  | 
3,733  | 
 
  | 
(53  | 
)  | 
2010  | 
9/14/2007  | 
 
2100 L Street (L)  | 
Washington, DC  | 
—  | 
 
  | 
35,868  | 
 
  | 
4,702  | 
 
  | 
—  | 
 
  | 
35,868  | 
 
  | 
4,702  | 
 
  | 
40,570  | 
 
  | 
—  | 
 
  | 
(8)  | 
8/11/2015  | 
 
2100 Rideout Road (O)  | 
Huntsville, AL  | 
—  | 
 
  | 
—  | 
 
  | 
4,551  | 
 
  | 
2,825  | 
 
  | 
—  | 
 
  | 
7,376  | 
 
  | 
7,376  | 
 
  | 
(44  | 
)  | 
2016 (7)  | 
3/23/2010  | 
 
22289 Exploration Drive (O)  | 
Lexington Park, MD  | 
—  | 
 
  | 
1,422  | 
 
  | 
5,719  | 
 
  | 
1,758  | 
 
  | 
1,422  | 
 
  | 
7,477  | 
 
  | 
8,899  | 
 
  | 
(3,146  | 
)  | 
2000  | 
3/24/2004  | 
 
22299 Exploration Drive (O)  | 
Lexington Park, MD  | 
—  | 
 
  | 
1,362  | 
 
  | 
5,790  | 
 
  | 
2,225  | 
 
  | 
1,362  | 
 
  | 
8,015  | 
 
  | 
9,377  | 
 
  | 
(3,123  | 
)  | 
1998  | 
3/24/2004  | 
 
22300 Exploration Drive (O)  | 
Lexington Park, MD  | 
—  | 
 
  | 
1,094  | 
 
  | 
5,038  | 
 
  | 
1,320  | 
 
  | 
1,094  | 
 
  | 
6,358  | 
 
  | 
7,452  | 
 
  | 
(2,224  | 
)  | 
1997  | 
11/9/2004  | 
 
22309 Exploration Drive (O)  | 
Lexington Park, MD  | 
—  | 
 
  | 
2,243  | 
 
  | 
10,419  | 
 
  | 
7,786  | 
 
  | 
2,243  | 
 
  | 
18,205  | 
 
  | 
20,448  | 
 
  | 
(5,383  | 
)  | 
1984/1997  | 
3/24/2004  | 
 
23535 Cottonwood Parkway (O)  | 
California, MD  | 
—  | 
 
  | 
692  | 
 
  | 
3,051  | 
 
  | 
468  | 
 
  | 
692  | 
 
  | 
3,519  | 
 
  | 
4,211  | 
 
  | 
(1,363  | 
)  | 
1984  | 
3/24/2004  | 
 
250 W Pratt St (O)  | 
Baltimore, MD  | 
—  | 
 
  | 
8,057  | 
 
  | 
34,605  | 
 
  | 
6,452  | 
 
  | 
8,057  | 
 
  | 
41,057  | 
 
  | 
49,114  | 
 
  | 
(4,244  | 
)  | 
1985  | 
3/19/2015  | 
 
2500 Riva Road (O)  | 
Annapolis, MD  | 
—  | 
 
  | 
2,791  | 
 
  | 
12,145  | 
 
  | 
1  | 
 
  | 
2,791  | 
 
  | 
12,146  | 
 
  | 
14,937  | 
 
  | 
(4,761  | 
)  | 
2000  | 
3/4/2003  | 
 
2600 Park Tower Drive (O)  | 
Vienna, VA  | 
—  | 
 
  | 
20,304  | 
 
  | 
34,443  | 
 
  | 
398  | 
 
  | 
20,304  | 
 
  | 
34,841  | 
 
  | 
55,145  | 
 
  | 
(2,406  | 
)  | 
1999  | 
4/15/2015  | 
 
2691 Technology Drive (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
2,098  | 
 
  | 
17,335  | 
 
  | 
5,519  | 
 
  | 
2,098  | 
 
  | 
22,854  | 
 
  | 
24,952  | 
 
  | 
(8,722  | 
)  | 
2005  | 
5/26/2000  | 
 
2701 Technology Drive (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
1,737  | 
 
  | 
15,266  | 
 
  | 
4,367  | 
 
  | 
1,737  | 
 
  | 
19,633  | 
 
  | 
21,370  | 
 
  | 
(8,652  | 
)  | 
2001  | 
5/26/2000  | 
 
2711 Technology Drive (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
2,251  | 
 
  | 
21,611  | 
 
  | 
1,806  | 
 
  | 
2,251  | 
 
  | 
23,417  | 
 
  | 
25,668  | 
 
  | 
(10,727  | 
)  | 
2002  | 
11/13/2000  | 
 
2720 Technology Drive (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
3,863  | 
 
  | 
29,272  | 
 
  | 
1,218  | 
 
  | 
3,863  | 
 
  | 
30,490  | 
 
  | 
34,353  | 
 
  | 
(9,173  | 
)  | 
2004  | 
1/31/2002  | 
 
2721 Technology Drive (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
4,611  | 
 
  | 
14,597  | 
 
  | 
1,272  | 
 
  | 
4,611  | 
 
  | 
15,869  | 
 
  | 
20,480  | 
 
  | 
(6,970  | 
)  | 
2000  | 
10/21/1999  | 
 
2730 Hercules Road (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
8,737  | 
 
  | 
31,611  | 
 
  | 
8,697  | 
 
  | 
8,737  | 
 
  | 
40,308  | 
 
  | 
49,045  | 
 
  | 
(17,118  | 
)  | 
1990  | 
9/28/1998  | 
 
30 Light Street (O)  | 
Baltimore, MD  | 
4,227  | 
 
  | 
—  | 
 
  | 
12,101  | 
 
  | 
51  | 
 
  | 
—  | 
 
  | 
12,152  | 
 
  | 
12,152  | 
 
  | 
(435  | 
)  | 
2009  | 
8/7/2015  | 
 
300 Sentinel Drive (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
1,517  | 
 
  | 
59,186  | 
 
  | 
913  | 
 
  | 
1,517  | 
 
  | 
60,099  | 
 
  | 
61,616  | 
 
  | 
(9,991  | 
)  | 
2009  | 
11/14/2003  | 
 
302 Sentinel Drive (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
2,648  | 
 
  | 
29,687  | 
 
  | 
454  | 
 
  | 
2,648  | 
 
  | 
30,141  | 
 
  | 
32,789  | 
 
  | 
(6,791  | 
)  | 
2007  | 
11/14/2003  | 
 
304 Sentinel Drive (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
3,411  | 
 
  | 
24,917  | 
 
  | 
204  | 
 
  | 
3,411  | 
 
  | 
25,121  | 
 
  | 
28,532  | 
 
  | 
(6,957  | 
)  | 
2005  | 
11/14/2003  | 
 
306 Sentinel Drive (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
3,260  | 
 
  | 
22,592  | 
 
  | 
829  | 
 
  | 
3,260  | 
 
  | 
23,421  | 
 
  | 
26,681  | 
 
  | 
(5,934  | 
)  | 
2006  | 
11/14/2003  | 
 
308 Sentinel Drive (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
1,422  | 
 
  | 
26,208  | 
 
  | 
68  | 
 
  | 
1,422  | 
 
  | 
26,276  | 
 
  | 
27,698  | 
 
  | 
(3,710  | 
)  | 
2010  | 
11/14/2003  | 
 
310 Sentinel Way (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
2,372  | 
 
  | 
37,069  | 
 
  | 
—  | 
 
  | 
2,372  | 
 
  | 
37,069  | 
 
  | 
39,441  | 
 
  | 
(1,051  | 
)  | 
2016 (7)  | 
11/14/2003  | 
 
310 The Bridge Street (O)  | 
Huntsville, AL  | 
—  | 
 
  | 
261  | 
 
  | 
26,531  | 
 
  | 
2,865  | 
 
  | 
261  | 
 
  | 
29,396  | 
 
  | 
29,657  | 
 
  | 
(6,215  | 
)  | 
2009  | 
8/9/2011  | 
 
312 Sentinel Way (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
3,138  | 
 
  | 
27,799  | 
 
  | 
—  | 
 
  | 
3,138  | 
 
  | 
27,799  | 
 
  | 
30,937  | 
 
  | 
(1,608  | 
)  | 
2014  | 
11/14/2003  | 
 
  
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
   | 
   | 
Initial Cost  | 
   | 
Gross Amounts Carried                     At Close of Period  | 
   | 
   | 
   | 
 
Property (Type) (1)  | 
Location  | 
Encumbrances (2)  | 
Land  | 
Building     and Land Improvements  | 
Costs Capitalized Subsequent to Acquisition  | 
Land  | 
Building      and Land Improvements  | 
Total       (3)(4)  | 
Accumulated Depreciation (5)  | 
Year Built or Renovated  | 
Date Acquired (6)  | 
 
3120 Fairview Park Drive (O) (10)  | 
Falls Church, VA  | 
—  | 
 
  | 
6,863  | 
 
  | 
16,930  | 
 
  | 
12,147  | 
 
  | 
6,863  | 
 
  | 
29,077  | 
 
  | 
35,940  | 
 
  | 
(3,321  | 
)  | 
2008  | 
11/23/2010  | 
 
314 Sentinel Way (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
1,254  | 
 
  | 
7,694  | 
 
  | 
—  | 
 
  | 
1,254  | 
 
  | 
7,694  | 
 
  | 
8,948  | 
 
  | 
(316  | 
)  | 
2008  | 
11/14/2003  | 
 
316 Sentinel Way (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
2,748  | 
 
  | 
38,156  | 
 
  | 
145  | 
 
  | 
2,748  | 
 
  | 
38,301  | 
 
  | 
41,049  | 
 
  | 
(4,538  | 
)  | 
2011  | 
11/14/2003  | 
 
318 Sentinel Way (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
2,185  | 
 
  | 
28,426  | 
 
  | 
—  | 
 
  | 
2,185  | 
 
  | 
28,426  | 
 
  | 
30,611  | 
 
  | 
(7,691  | 
)  | 
2005  | 
11/14/2003  | 
 
320 Sentinel Way (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
2,067  | 
 
  | 
21,623  | 
 
  | 
—  | 
 
  | 
2,067  | 
 
  | 
21,623  | 
 
  | 
23,690  | 
 
  | 
(4,851  | 
)  | 
2007  | 
11/14/2003  | 
 
322 Sentinel Way (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
2,605  | 
 
  | 
22,827  | 
 
  | 
—  | 
 
  | 
2,605  | 
 
  | 
22,827  | 
 
  | 
25,432  | 
 
  | 
(5,714  | 
)  | 
2006  | 
11/14/2003  | 
 
324 Sentinel Way (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
1,656  | 
 
  | 
23,018  | 
 
  | 
—  | 
 
  | 
1,656  | 
 
  | 
23,018  | 
 
  | 
24,674  | 
 
  | 
(3,654  | 
)  | 
2010  | 
6/29/2006  | 
 
410 National Business Parkway (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
1,831  | 
 
  | 
23,257  | 
 
  | 
121  | 
 
  | 
1,831  | 
 
  | 
23,378  | 
 
  | 
25,209  | 
 
  | 
(2,311  | 
)  | 
2012  | 
6/29/2006  | 
 
420 National Business Parkway (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
2,370  | 
 
  | 
27,650  | 
 
  | 
110  | 
 
  | 
2,370  | 
 
  | 
27,760  | 
 
  | 
30,130  | 
 
  | 
(1,931  | 
)  | 
2013  | 
6/29/2006  | 
 
430 National Business Parkway (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
1,852  | 
 
  | 
21,299  | 
 
  | 
161  | 
 
  | 
1,852  | 
 
  | 
21,460  | 
 
  | 
23,312  | 
 
  | 
(2,580  | 
)  | 
2011  | 
6/29/2006  | 
 
44408 Pecan Court (O)  | 
California, MD  | 
—  | 
 
  | 
817  | 
 
  | 
1,583  | 
 
  | 
581  | 
 
  | 
817  | 
 
  | 
2,164  | 
 
  | 
2,981  | 
 
  | 
(699  | 
)  | 
1986  | 
3/24/2004  | 
 
44414 Pecan Court (O)  | 
California, MD  | 
—  | 
 
  | 
405  | 
 
  | 
1,619  | 
 
  | 
341  | 
 
  | 
405  | 
 
  | 
1,960  | 
 
  | 
2,365  | 
 
  | 
(808  | 
)  | 
1986  | 
3/24/2004  | 
 
44417 Pecan Court (O)  | 
California, MD  | 
—  | 
 
  | 
434  | 
 
  | 
3,348  | 
 
  | 
88  | 
 
  | 
434  | 
 
  | 
3,436  | 
 
  | 
3,870  | 
 
  | 
(1,277  | 
)  | 
1989/2015  | 
3/24/2004  | 
 
44420 Pecan Court (O)  | 
California, MD  | 
—  | 
 
  | 
344  | 
 
  | 
890  | 
 
  | 
168  | 
 
  | 
344  | 
 
  | 
1,058  | 
 
  | 
1,402  | 
 
  | 
(311  | 
)  | 
1989  | 
11/9/2004  | 
 
44425 Pecan Court (O)  | 
California, MD  | 
—  | 
 
  | 
1,309  | 
 
  | 
3,506  | 
 
  | 
1,671  | 
 
  | 
1,309  | 
 
  | 
5,177  | 
 
  | 
6,486  | 
 
  | 
(2,090  | 
)  | 
1997  | 
5/5/2004  | 
 
45310 Abell House Lane (O)  | 
California, MD  | 
—  | 
 
  | 
2,272  | 
 
  | 
13,808  | 
 
  | 
—  | 
 
  | 
2,272  | 
 
  | 
13,808  | 
 
  | 
16,080  | 
 
  | 
(1,748  | 
)  | 
2011  | 
8/30/2010  | 
 
46579 Expedition Drive (O)  | 
Lexington Park, MD  | 
—  | 
 
  | 
1,406  | 
 
  | 
5,796  | 
 
  | 
1,409  | 
 
  | 
1,406  | 
 
  | 
7,205  | 
 
  | 
8,611  | 
 
  | 
(3,229  | 
)  | 
2002  | 
3/24/2004  | 
 
46591 Expedition Drive (O)  | 
Lexington Park, MD  | 
—  | 
 
  | 
1,200  | 
 
  | 
7,199  | 
 
  | 
1,236  | 
 
  | 
1,200  | 
 
  | 
8,435  | 
 
  | 
9,635  | 
 
  | 
(2,289  | 
)  | 
2005  | 
3/24/2004  | 
 
4851 Stonecroft Boulevard (O)  | 
Chantilly, VA  | 
—  | 
 
  | 
1,878  | 
 
  | 
11,558  | 
 
  | 
21  | 
 
  | 
1,878  | 
 
  | 
11,579  | 
 
  | 
13,457  | 
 
  | 
(3,538  | 
)  | 
2004  | 
8/14/2002  | 
 
5325 Nottingham Drive (O) (10)  | 
White Marsh, MD  | 
—  | 
 
  | 
816  | 
 
  | 
2,994  | 
 
  | 
485  | 
 
  | 
816  | 
 
  | 
3,479  | 
 
  | 
4,295  | 
 
  | 
(370  | 
)  | 
2002  | 
1/9/2007  | 
 
5355 Nottingham Drive (O) (10)  | 
White Marsh, MD  | 
—  | 
 
  | 
761  | 
 
  | 
2,281  | 
 
  | 
1,917  | 
 
  | 
761  | 
 
  | 
4,198  | 
 
  | 
4,959  | 
 
  | 
(1,445  | 
)  | 
2005  | 
1/9/2007  | 
 
540 National Business Parkway (O)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
2,035  | 
 
  | 
26,273  | 
 
  | 
—  | 
 
  | 
2,035  | 
 
  | 
26,273  | 
 
  | 
28,308  | 
 
  | 
—  | 
 
  | 
(7)  | 
6/29/2006  | 
 
5520 Research Park Drive (O)  | 
Catonsville, MD  | 
—  | 
 
  | 
—  | 
 
  | 
20,072  | 
 
  | 
287  | 
 
  | 
—  | 
 
  | 
20,359  | 
 
  | 
20,359  | 
 
  | 
(3,716  | 
)  | 
2009  | 
4/4/2006  | 
 
5522 Research Park Drive (O)  | 
Catonsville, MD  | 
—  | 
 
  | 
—  | 
 
  | 
4,550  | 
 
  | 
—  | 
 
  | 
—  | 
 
  | 
4,550  | 
 
  | 
4,550  | 
 
  | 
(1,069  | 
)  | 
2007  | 
3/8/2006  | 
 
5801 University Research Court (O)  | 
College Park, MD  | 
—  | 
 
  | 
—  | 
 
  | 
1,964  | 
 
  | 
—  | 
 
  | 
—  | 
 
  | 
1,964  | 
 
  | 
1,964  | 
 
  | 
—  | 
 
  | 
(7)  | 
11/9/2016  | 
 
5825 University Research Court (O)  | 
College Park, MD  | 
21,677  | 
 
  | 
—  | 
 
  | 
22,740  | 
 
  | 
126  | 
 
  | 
—  | 
 
  | 
22,866  | 
 
  | 
22,866  | 
 
  | 
(4,413  | 
)  | 
2008  | 
1/29/2008  | 
 
5850 University Research Court (O)  | 
College Park, MD  | 
22,933  | 
 
  | 
—  | 
 
  | 
31,906  | 
 
  | 
405  | 
 
  | 
—  | 
 
  | 
32,311  | 
 
  | 
32,311  | 
 
  | 
(5,446  | 
)  | 
2008  | 
1/29/2008  | 
 
6700 Alexander Bell Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,755  | 
 
  | 
6,951  | 
 
  | 
6,490  | 
 
  | 
1,755  | 
 
  | 
13,441  | 
 
  | 
15,196  | 
 
  | 
(6,373  | 
)  | 
1988  | 
5/14/2001  | 
 
6708 Alexander Bell Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
897  | 
 
  | 
8,975  | 
 
  | 
1,605  | 
 
  | 
897  | 
 
  | 
10,580  | 
 
  | 
11,477  | 
 
  | 
(3,612  | 
)  | 
1988/2016  | 
5/14/2001  | 
 
6711 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
2,683  | 
 
  | 
23,240  | 
 
  | 
1,032  | 
 
  | 
2,683  | 
 
  | 
24,272  | 
 
  | 
26,955  | 
 
  | 
(6,070  | 
)  | 
2006-2007  | 
9/28/2000  | 
 
6716 Alexander Bell Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,242  | 
 
  | 
4,973  | 
 
  | 
3,707  | 
 
  | 
1,242  | 
 
  | 
8,680  | 
 
  | 
9,922  | 
 
  | 
(4,743  | 
)  | 
1990  | 
12/31/1998  | 
 
6721 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,753  | 
 
  | 
34,090  | 
 
  | 
85  | 
 
  | 
1,753  | 
 
  | 
34,175  | 
 
  | 
35,928  | 
 
  | 
(6,655  | 
)  | 
2009  | 
9/28/2000  | 
 
6724 Alexander Bell Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
449  | 
 
  | 
5,039  | 
 
  | 
1,190  | 
 
  | 
449  | 
 
  | 
6,229  | 
 
  | 
6,678  | 
 
  | 
(2,426  | 
)  | 
2001  | 
5/14/2001  | 
 
6731 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
2,807  | 
 
  | 
19,098  | 
 
  | 
3,002  | 
 
  | 
2,807  | 
 
  | 
22,100  | 
 
  | 
24,907  | 
 
  | 
(9,285  | 
)  | 
2002  | 
3/29/2000  | 
 
6740 Alexander Bell Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,424  | 
 
  | 
5,696  | 
 
  | 
3,305  | 
 
  | 
1,424  | 
 
  | 
9,001  | 
 
  | 
10,425  | 
 
  | 
(5,405  | 
)  | 
1992  | 
12/31/1998  | 
 
6741 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
675  | 
 
  | 
1,711  | 
 
  | 
124  | 
 
  | 
675  | 
 
  | 
1,835  | 
 
  | 
2,510  | 
 
  | 
(411  | 
)  | 
2008  | 
9/28/2000  | 
 
6750 Alexander Bell Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,263  | 
 
  | 
12,461  | 
 
  | 
3,622  | 
 
  | 
1,263  | 
 
  | 
16,083  | 
 
  | 
17,346  | 
 
  | 
(8,151  | 
)  | 
2001  | 
12/31/1998  | 
 
6760 Alexander Bell Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
890  | 
 
  | 
3,561  | 
 
  | 
3,155  | 
 
  | 
890  | 
 
  | 
6,716  | 
 
  | 
7,606  | 
 
  | 
(3,560  | 
)  | 
1991  | 
12/31/1998  | 
 
6940 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
3,545  | 
 
  | 
9,917  | 
 
  | 
5,877  | 
 
  | 
3,545  | 
 
  | 
15,794  | 
 
  | 
19,339  | 
 
  | 
(7,558  | 
)  | 
1999  | 
11/13/1998  | 
 
  
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
   | 
   | 
Initial Cost  | 
   | 
Gross Amounts Carried                     At Close of Period  | 
   | 
   | 
   | 
 
Property (Type) (1)  | 
Location  | 
Encumbrances (2)  | 
Land  | 
Building     and Land Improvements  | 
Costs Capitalized Subsequent to Acquisition  | 
Land  | 
Building      and Land Improvements  | 
Total       (3)(4)  | 
Accumulated Depreciation (5)  | 
Year Built or Renovated  | 
Date Acquired (6)  | 
 
6950 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
3,596  | 
 
  | 
14,269  | 
 
  | 
3,220  | 
 
  | 
3,596  | 
 
  | 
17,489  | 
 
  | 
21,085  | 
 
  | 
(8,096  | 
)  | 
1998  | 
10/22/1998  | 
 
7000 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
3,131  | 
 
  | 
12,103  | 
 
  | 
5,205  | 
 
  | 
3,131  | 
 
  | 
17,308  | 
 
  | 
20,439  | 
 
  | 
(5,280  | 
)  | 
1999  | 
5/31/2002  | 
 
7005 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
3,036  | 
 
  | 
424  | 
 
  | 
—  | 
 
  | 
3,036  | 
 
  | 
424  | 
 
  | 
3,460  | 
 
  | 
—  | 
 
  | 
(8)  | 
6/26/2014  | 
 
7015 Albert Einstein Drive (O)  | 
Columbia, MD  | 
1,214  | 
 
  | 
2,058  | 
 
  | 
6,093  | 
 
  | 
1,993  | 
 
  | 
2,058  | 
 
  | 
8,086  | 
 
  | 
10,144  | 
 
  | 
(3,142  | 
)  | 
1999  | 
12/1/2005  | 
 
7061 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
729  | 
 
  | 
3,094  | 
 
  | 
2,018  | 
 
  | 
729  | 
 
  | 
5,112  | 
 
  | 
5,841  | 
 
  | 
(1,971  | 
)  | 
2000  | 
8/30/2001  | 
 
7063 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
902  | 
 
  | 
3,684  | 
 
  | 
2,449  | 
 
  | 
902  | 
 
  | 
6,133  | 
 
  | 
7,035  | 
 
  | 
(2,760  | 
)  | 
2000  | 
8/30/2001  | 
 
7065 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
919  | 
 
  | 
3,763  | 
 
  | 
3,095  | 
 
  | 
919  | 
 
  | 
6,858  | 
 
  | 
7,777  | 
 
  | 
(3,205  | 
)  | 
2000  | 
8/30/2001  | 
 
7067 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,829  | 
 
  | 
11,823  | 
 
  | 
2,975  | 
 
  | 
1,829  | 
 
  | 
14,798  | 
 
  | 
16,627  | 
 
  | 
(6,605  | 
)  | 
2001  | 
8/30/2001  | 
 
7125 Columbia Gateway Drive (L)  | 
Columbia, MD  | 
—  | 
 
  | 
3,361  | 
 
  | 
2,207  | 
 
  | 
279  | 
 
  | 
3,361  | 
 
  | 
2,486  | 
 
  | 
5,847  | 
 
  | 
—  | 
 
  | 
1973/1999 (8)  | 
6/29/2006  | 
 
7125 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
17,126  | 
 
  | 
46,994  | 
 
  | 
11,442  | 
 
  | 
17,126  | 
 
  | 
58,436  | 
 
  | 
75,562  | 
 
  | 
(18,673  | 
)  | 
1973/1999  | 
6/29/2006  | 
 
7130 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,350  | 
 
  | 
4,359  | 
 
  | 
2,232  | 
 
  | 
1,350  | 
 
  | 
6,591  | 
 
  | 
7,941  | 
 
  | 
(3,009  | 
)  | 
1989  | 
9/19/2005  | 
 
7134 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
704  | 
 
  | 
4,128  | 
 
  | 
327  | 
 
  | 
704  | 
 
  | 
4,455  | 
 
  | 
5,159  | 
 
  | 
(1,317  | 
)  | 
1990/2016 (7)  | 
9/19/2005  | 
 
7138 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,104  | 
 
  | 
3,518  | 
 
  | 
2,448  | 
 
  | 
1,104  | 
 
  | 
5,966  | 
 
  | 
7,070  | 
 
  | 
(3,292  | 
)  | 
1990  | 
9/19/2005  | 
 
7142 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,342  | 
 
  | 
3,978  | 
 
  | 
2,608  | 
 
  | 
1,342  | 
 
  | 
6,586  | 
 
  | 
7,928  | 
 
  | 
(2,556  | 
)  | 
1994  | 
9/19/2005  | 
 
7150 Columbia Gateway Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,032  | 
 
  | 
3,429  | 
 
  | 
783  | 
 
  | 
1,032  | 
 
  | 
4,212  | 
 
  | 
5,244  | 
 
  | 
(1,301  | 
)  | 
1991  | 
9/19/2005  | 
 
7150 Riverwood Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,821  | 
 
  | 
4,388  | 
 
  | 
1,727  | 
 
  | 
1,821  | 
 
  | 
6,115  | 
 
  | 
7,936  | 
 
  | 
(2,118  | 
)  | 
2000  | 
1/10/2007  | 
 
7160 Riverwood Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
2,732  | 
 
  | 
7,006  | 
 
  | 
2,296  | 
 
  | 
2,732  | 
 
  | 
9,302  | 
 
  | 
12,034  | 
 
  | 
(3,521  | 
)  | 
2000  | 
1/10/2007  | 
 
7170 Riverwood Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,283  | 
 
  | 
3,096  | 
 
  | 
1,315  | 
 
  | 
1,283  | 
 
  | 
4,411  | 
 
  | 
5,694  | 
 
  | 
(1,558  | 
)  | 
2000  | 
1/10/2007  | 
 
7175 Riverwood Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,788  | 
 
  | 
7,269  | 
 
  | 
—  | 
 
  | 
1,788  | 
 
  | 
7,269  | 
 
  | 
9,057  | 
 
  | 
(571  | 
)  | 
1996/2013  | 
7/27/2005  | 
 
7200 Redstone Gateway (O)  | 
Huntsville, AL  | 
6,479  | 
 
  | 
—  | 
 
  | 
8,348  | 
 
  | 
5  | 
 
  | 
—  | 
 
  | 
8,353  | 
 
  | 
8,353  | 
 
  | 
(540  | 
)  | 
2013  | 
3/23/2010  | 
 
7200 Riverwood Road (O)  | 
Columbia, MD  | 
—  | 
 
  | 
4,089  | 
 
  | 
22,389  | 
 
  | 
4,675  | 
 
  | 
4,089  | 
 
  | 
27,064  | 
 
  | 
31,153  | 
 
  | 
(9,338  | 
)  | 
1986  | 
10/13/1998  | 
 
7205 Riverwood Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,367  | 
 
  | 
21,419  | 
 
  | 
—  | 
 
  | 
1,367  | 
 
  | 
21,419  | 
 
  | 
22,786  | 
 
  | 
(1,845  | 
)  | 
2013  | 
7/27/2005  | 
 
7272 Park Circle Drive (O)  | 
Hanover, MD  | 
—  | 
 
  | 
1,479  | 
 
  | 
6,300  | 
 
  | 
4,132  | 
 
  | 
1,479  | 
 
  | 
10,432  | 
 
  | 
11,911  | 
 
  | 
(3,412  | 
)  | 
1991/1996  | 
1/10/2007  | 
 
7318 Parkway Drive (O)  | 
Hanover, MD  | 
—  | 
 
  | 
972  | 
 
  | 
3,888  | 
 
  | 
1,224  | 
 
  | 
972  | 
 
  | 
5,112  | 
 
  | 
6,084  | 
 
  | 
(2,234  | 
)  | 
1984  | 
4/16/1999  | 
 
7320 Parkway Drive (O)  | 
Hanover, MD  | 
—  | 
 
  | 
905  | 
 
  | 
1,444  | 
 
  | 
5,037  | 
 
  | 
905  | 
 
  | 
6,481  | 
 
  | 
7,386  | 
 
  | 
(1,302  | 
)  | 
1983  | 
4/4/2002  | 
 
7400 Redstone Gateway (O)  | 
Huntsville, AL  | 
7,107  | 
 
  | 
—  | 
 
  | 
9,223  | 
 
  | 
—  | 
 
  | 
—  | 
 
  | 
9,223  | 
 
  | 
9,223  | 
 
  | 
(351  | 
)  | 
2015  | 
3/23/2010  | 
 
7467 Ridge Road (O)  | 
Hanover, MD  | 
—  | 
 
  | 
1,629  | 
 
  | 
3,052  | 
 
  | 
4,136  | 
 
  | 
1,629  | 
 
  | 
7,188  | 
 
  | 
8,817  | 
 
  | 
(1,424  | 
)  | 
1990  | 
4/28/1999  | 
 
7740 Milestone Parkway (O)  | 
Hanover, MD  | 
18,604  | 
 
  | 
3,825  | 
 
  | 
34,177  | 
 
  | 
430  | 
 
  | 
3,825  | 
 
  | 
34,607  | 
 
  | 
38,432  | 
 
  | 
(5,572  | 
)  | 
2009  | 
7/2/2007  | 
 
7770 Backlick Road (O)  | 
Springfield, VA  | 
—  | 
 
  | 
6,387  | 
 
  | 
75,268  | 
 
  | 
142  | 
 
  | 
6,387  | 
 
  | 
75,410  | 
 
  | 
81,797  | 
 
  | 
(7,171  | 
)  | 
2012  | 
3/10/2010  | 
 
7880 Milestone Parkway (O)  | 
Hanover, MD  | 
—  | 
 
  | 
4,857  | 
 
  | 
24,419  | 
 
  | 
63  | 
 
  | 
4,857  | 
 
  | 
24,482  | 
 
  | 
29,339  | 
 
  | 
(764  | 
)  | 
2015  | 
9/17/2013  | 
 
8010 Corporate Drive (O) (10)  | 
White Marsh, MD  | 
—  | 
 
  | 
1,349  | 
 
  | 
1,523  | 
 
  | 
—  | 
 
  | 
1,349  | 
 
  | 
1,523  | 
 
  | 
2,872  | 
 
  | 
(572  | 
)  | 
1998  | 
1/9/2007  | 
 
8020 Corporate Drive (O) (10)  | 
White Marsh, MD  | 
—  | 
 
  | 
2,184  | 
 
  | 
1,057  | 
 
  | 
—  | 
 
  | 
2,184  | 
 
  | 
1,057  | 
 
  | 
3,241  | 
 
  | 
(684  | 
)  | 
1997  | 
1/9/2007  | 
 
8094 Sandpiper Circle (O) (10)  | 
White Marsh, MD  | 
—  | 
 
  | 
1,960  | 
 
  | 
2,288  | 
 
  | 
1,131  | 
 
  | 
1,960  | 
 
  | 
3,419  | 
 
  | 
5,379  | 
 
  | 
(331  | 
)  | 
1998  | 
1/9/2007  | 
 
8098 Sandpiper Circle (O) (10)  | 
White Marsh, MD  | 
—  | 
 
  | 
1,797  | 
 
  | 
1,417  | 
 
  | 
639  | 
 
  | 
1,797  | 
 
  | 
2,056  | 
 
  | 
3,853  | 
 
  | 
—  | 
 
  | 
1998  | 
1/9/2007  | 
 
8110 Corporate Drive (O) (10)  | 
White Marsh, MD  | 
—  | 
 
  | 
2,285  | 
 
  | 
5,351  | 
 
  | 
989  | 
 
  | 
2,285  | 
 
  | 
6,340  | 
 
  | 
8,625  | 
 
  | 
(757  | 
)  | 
2001  | 
1/9/2007  | 
 
8140 Corporate Drive (O) (10)  | 
White Marsh, MD  | 
—  | 
 
  | 
2,158  | 
 
  | 
6,394  | 
 
  | 
3,760  | 
 
  | 
2,158  | 
 
  | 
10,154  | 
 
  | 
12,312  | 
 
  | 
(2,085  | 
)  | 
2003  | 
1/9/2007  | 
 
8621 Robert Fulton Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
2,317  | 
 
  | 
12,642  | 
 
  | 
355  | 
 
  | 
2,317  | 
 
  | 
12,997  | 
 
  | 
15,314  | 
 
  | 
(3,740  | 
)  | 
2005-2006  | 
6/10/2005  | 
 
8661 Robert Fulton Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,510  | 
 
  | 
3,764  | 
 
  | 
2,427  | 
 
  | 
1,510  | 
 
  | 
6,191  | 
 
  | 
7,701  | 
 
  | 
(2,386  | 
)  | 
2002  | 
12/30/2003  | 
 
8671 Robert Fulton Drive (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,718  | 
 
  | 
4,280  | 
 
  | 
4,052  | 
 
  | 
1,718  | 
 
  | 
8,332  | 
 
  | 
10,050  | 
 
  | 
(3,354  | 
)  | 
2002  | 
12/30/2003  | 
 
  
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
   | 
   | 
Initial Cost  | 
   | 
Gross Amounts Carried                     At Close of Period  | 
   | 
   | 
   | 
 
Property (Type) (1)  | 
Location  | 
Encumbrances (2)  | 
Land  | 
Building     and Land Improvements  | 
Costs Capitalized Subsequent to Acquisition  | 
Land  | 
Building      and Land Improvements  | 
Total       (3)(4)  | 
Accumulated Depreciation (5)  | 
Year Built or Renovated  | 
Date Acquired (6)  | 
 
870 Elkridge Landing Road (O)  | 
Linthicum, MD  | 
—  | 
 
  | 
2,003  | 
 
  | 
9,442  | 
 
  | 
7,611  | 
 
  | 
2,003  | 
 
  | 
17,053  | 
 
  | 
19,056  | 
 
  | 
(8,888  | 
)  | 
1981  | 
8/3/2001  | 
 
891 Elkridge Landing Road (O)  | 
Linthicum, MD  | 
—  | 
 
  | 
1,165  | 
 
  | 
4,772  | 
 
  | 
2,948  | 
 
  | 
1,165  | 
 
  | 
7,720  | 
 
  | 
8,885  | 
 
  | 
(3,806  | 
)  | 
1984  | 
7/2/2001  | 
 
901 Elkridge Landing Road (O)  | 
Linthicum, MD  | 
—  | 
 
  | 
1,156  | 
 
  | 
4,437  | 
 
  | 
2,386  | 
 
  | 
1,156  | 
 
  | 
6,823  | 
 
  | 
7,979  | 
 
  | 
(3,319  | 
)  | 
1984  | 
7/2/2001  | 
 
911 Elkridge Landing Road (O)  | 
Linthicum, MD  | 
—  | 
 
  | 
1,215  | 
 
  | 
4,861  | 
 
  | 
2,043  | 
 
  | 
1,215  | 
 
  | 
6,904  | 
 
  | 
8,119  | 
 
  | 
(3,679  | 
)  | 
1985  | 
4/30/1998  | 
 
938 Elkridge Landing Road (O)  | 
Linthicum, MD  | 
—  | 
 
  | 
922  | 
 
  | 
4,748  | 
 
  | 
1,469  | 
 
  | 
922  | 
 
  | 
6,217  | 
 
  | 
7,139  | 
 
  | 
(2,338  | 
)  | 
1984  | 
7/2/2001  | 
 
939 Elkridge Landing Road (O)  | 
Linthicum, MD  | 
—  | 
 
  | 
939  | 
 
  | 
3,756  | 
 
  | 
4,437  | 
 
  | 
939  | 
 
  | 
8,193  | 
 
  | 
9,132  | 
 
  | 
(3,797  | 
)  | 
1983  | 
4/30/1998  | 
 
940 Elkridge Landing Road (L)  | 
Linthicum, MD  | 
—  | 
 
  | 
842  | 
 
  | 
4  | 
 
  | 
—  | 
 
  | 
842  | 
 
  | 
4  | 
 
  | 
846  | 
 
  | 
—  | 
 
  | 
(8)  | 
7/2/2001  | 
 
9651 Hornbaker Road (D)  | 
Manassas, VA  | 
—  | 
 
  | 
6,050  | 
 
  | 
249,074  | 
 
  | 
1,140  | 
 
  | 
6,050  | 
 
  | 
250,214  | 
 
  | 
256,264  | 
 
  | 
(28,553  | 
)  | 
2010  | 
9/14/2010  | 
 
Arundel Preserve (L)  | 
Hanover, MD  | 
—  | 
 
  | 
13,401  | 
 
  | 
9,565  | 
 
  | 
—  | 
 
  | 
13,401  | 
 
  | 
9,565  | 
 
  | 
22,966  | 
 
  | 
—  | 
 
  | 
(8)  | 
7/2/2007  | 
 
Bethlehem Technology Park-DC18 (O)  | 
Manassas, VA  | 
—  | 
 
  | 
3,599  | 
 
  | 
4,301  | 
 
  | 
—  | 
 
  | 
3,599  | 
 
  | 
4,301  | 
 
  | 
7,900  | 
 
  | 
—  | 
 
  | 
(7)  | 
6/17/2016  | 
 
Bethlehem Technology Park-DC19 (O)  | 
Manassas, VA  | 
—  | 
 
  | 
3,708  | 
 
  | 
17,504  | 
 
  | 
—  | 
 
  | 
3,708  | 
 
  | 
17,504  | 
 
  | 
21,212  | 
 
  | 
(34  | 
)  | 
2016  | 
6/9/2016  | 
 
Bethlehem Technology Park-DC20 (O)  | 
Manassas, VA  | 
—  | 
 
  | 
3,599  | 
 
  | 
12,217  | 
 
  | 
—  | 
 
  | 
3,599  | 
 
  | 
12,217  | 
 
  | 
15,816  | 
 
  | 
—  | 
 
  | 
(7)  | 
6/9/2016  | 
 
Canton Crossing Land (L)  | 
Baltimore, MD  | 
—  | 
 
  | 
16,085  | 
 
  | 
2,381  | 
 
  | 
—  | 
 
  | 
16,085  | 
 
  | 
2,381  | 
 
  | 
18,466  | 
 
  | 
—  | 
 
  | 
(8)  | 
10/27/2009  | 
 
Canton Crossing Util Distr Ctr (O)  | 
Baltimore, MD  | 
—  | 
 
  | 
7,300  | 
 
  | 
15,556  | 
 
  | 
986  | 
 
  | 
7,300  | 
 
  | 
16,542  | 
 
  | 
23,842  | 
 
  | 
(3,900  | 
)  | 
2006  | 
10/27/2009  | 
 
Columbia Gateway - Southridge (L)  | 
Columbia, MD  | 
—  | 
 
  | 
6,387  | 
 
  | 
3,659  | 
 
  | 
—  | 
 
  | 
6,387  | 
 
  | 
3,659  | 
 
  | 
10,046  | 
 
  | 
—  | 
 
  | 
(8)  | 
9/20/2004  | 
 
Dahlgren Technology Center (L)  | 
Dahlgren, VA  | 
—  | 
 
  | 
978  | 
 
  | 
178  | 
 
  | 
—  | 
 
  | 
978  | 
 
  | 
178  | 
 
  | 
1,156  | 
 
  | 
—  | 
 
  | 
(8)  | 
3/16/2005  | 
 
Expedition VII (L)  | 
Lexington Park, MD  | 
—  | 
 
  | 
705  | 
 
  | 
729  | 
 
  | 
—  | 
 
  | 
705  | 
 
  | 
729  | 
 
  | 
1,434  | 
 
  | 
—  | 
 
  | 
(8)  | 
3/24/2004  | 
 
Innovation Park (L)  | 
Manassas, VA  | 
—  | 
 
  | 
4,443  | 
 
  | 
94  | 
 
  | 
—  | 
 
  | 
4,443  | 
 
  | 
94  | 
 
  | 
4,537  | 
 
  | 
—  | 
 
  | 
(8)  | 
9/1/2016  | 
 
M Square Research Park (L)  | 
College Park, MD  | 
—  | 
 
  | 
—  | 
 
  | 
2,581  | 
 
  | 
—  | 
 
  | 
—  | 
 
  | 
2,581  | 
 
  | 
2,581  | 
 
  | 
—  | 
 
  | 
(8)  | 
1/29/2008  | 
 
National Business Park North (L)  | 
Annapolis Junction, MD  | 
—  | 
 
  | 
28,066  | 
 
  | 
44,579  | 
 
  | 
—  | 
 
  | 
28,066  | 
 
  | 
44,579  | 
 
  | 
72,645  | 
 
  | 
—  | 
 
  | 
(8)  | 
6/29/2006  | 
 
North Gate Business Park (L)  | 
Aberdeen, MD  | 
—  | 
 
  | 
4,212  | 
 
  | 
2,198  | 
 
  | 
—  | 
 
  | 
4,212  | 
 
  | 
2,198  | 
 
  | 
6,410  | 
 
  | 
—  | 
 
  | 
(8)  | 
9/14/2007  | 
 
Northwest Crossroads (L)  | 
San Antonio, TX  | 
—  | 
 
  | 
7,430  | 
 
  | 
847  | 
 
  | 
—  | 
 
  | 
7,430  | 
 
  | 
847  | 
 
  | 
8,277  | 
 
  | 
—  | 
 
  | 
(8)  | 
1/20/2006  | 
 
NOVA Office A (O) (9)  | 
Chantilly, VA  | 
—  | 
 
  | 
2,096  | 
 
  | 
46,800  | 
 
  | 
—  | 
 
  | 
2,096  | 
 
  | 
46,800  | 
 
  | 
48,896  | 
 
  | 
(2,230  | 
)  | 
2015  | 
7/31/2002  | 
 
NOVA Office B (O) (9)  | 
Chantilly, VA  | 
—  | 
 
  | 
739  | 
 
  | 
27,112  | 
 
  | 
—  | 
 
  | 
739  | 
 
  | 
27,112  | 
 
  | 
27,851  | 
 
  | 
(450  | 
)  | 
2016 (7)  | 
7/31/2002  | 
 
NOVA Office D (O)  | 
Chantilly, VA  | 
—  | 
 
  | 
6,587  | 
 
  | 
10,985  | 
 
  | 
—  | 
 
  | 
6,587  | 
 
  | 
10,985  | 
 
  | 
17,572  | 
 
  | 
—  | 
 
  | 
(7)  | 
7/31/2002  | 
 
Old Annapolis Road (O)  | 
Columbia, MD  | 
—  | 
 
  | 
1,637  | 
 
  | 
5,500  | 
 
  | 
4,872  | 
 
  | 
1,637  | 
 
  | 
10,372  | 
 
  | 
12,009  | 
 
  | 
(3,237  | 
)  | 
1974/1985  | 
12/14/2000  | 
 
Patriot Point - DC15 (O)  | 
Ashburn, VA  | 
—  | 
 
  | 
12,156  | 
 
  | 
16,844  | 
 
  | 
—  | 
 
  | 
12,156  | 
 
  | 
16,844  | 
 
  | 
29,000  | 
 
  | 
(328  | 
)  | 
2016  | 
10/15/2015  | 
 
Patriot Point - DC16 (O)  | 
Ashburn, VA  | 
—  | 
 
  | 
12,156  | 
 
  | 
16,556  | 
 
  | 
—  | 
 
  | 
12,156  | 
 
  | 
16,556  | 
 
  | 
28,712  | 
 
  | 
(289  | 
)  | 
2016  | 
10/15/2015  | 
 
Patriot Point - DC17 (O)  | 
Ashburn, VA  | 
—  | 
 
  | 
6,078  | 
 
  | 
15,971  | 
 
  | 
—  | 
 
  | 
6,078  | 
 
  | 
15,971  | 
 
  | 
22,049  | 
 
  | 
(117  | 
)  | 
2016  | 
10/15/2015  | 
 
Patriot Ridge (L)  | 
Springfield, VA  | 
—  | 
 
  | 
18,517  | 
 
  | 
14,461  | 
 
  | 
—  | 
 
  | 
18,517  | 
 
  | 
14,461  | 
 
  | 
32,978  | 
 
  | 
—  | 
 
  | 
(8)  | 
3/10/2010  | 
 
Redstone Gateway (L)  | 
Huntsville, AL  | 
—  | 
 
  | 
—  | 
 
  | 
18,364  | 
 
  | 
—  | 
 
  | 
—  | 
 
  | 
18,364  | 
 
  | 
18,364  | 
 
  | 
—  | 
 
  | 
(8)  | 
3/23/2010  | 
 
Route 15/Biggs Ford Road (L)  | 
Frederick, MD  | 
—  | 
 
  | 
1,129  | 
 
  | 
—  | 
 
  | 
—  | 
 
  | 
1,129  | 
 
  | 
—  | 
 
  | 
1,129  | 
 
  | 
—  | 
 
  | 
(8)  | 
8/28/2008  | 
 
Sentry Gateway (L)  | 
San Antonio, TX  | 
—  | 
 
  | 
8,275  | 
 
  | 
3,645  | 
 
  | 
—  | 
 
  | 
8,275  | 
 
  | 
3,645  | 
 
  | 
11,920  | 
 
  | 
—  | 
 
  | 
(8)  | 
3/30/2005  | 
 
Sentry Gateway - T (O)  | 
San Antonio, TX  | 
—  | 
 
  | 
14,020  | 
 
  | 
38,804  | 
 
  | 
13  | 
 
  | 
14,020  | 
 
  | 
38,817  | 
 
  | 
52,837  | 
 
  | 
(9,590  | 
)  | 
1982/1985  | 
3/30/2005  | 
 
Sentry Gateway - V (O)  | 
San Antonio, TX  | 
—  | 
 
  | 
—  | 
 
  | 
1,066  | 
 
  | 
—  | 
 
  | 
—  | 
 
  | 
1,066  | 
 
  | 
1,066  | 
 
  | 
(215  | 
)  | 
2007  | 
3/30/2005  | 
 
Sentry Gateway - W (O)  | 
San Antonio, TX  | 
—  | 
 
  | 
—  | 
 
  | 
1,884  | 
 
  | 
—  | 
 
  | 
—  | 
 
  | 
1,884  | 
 
  | 
1,884  | 
 
  | 
(343  | 
)  | 
2009  | 
3/30/2005  | 
 
Sentry Gateway - X (O)  | 
San Antonio, TX  | 
—  | 
 
  | 
1,964  | 
 
  | 
21,178  | 
 
  | 
—  | 
 
  | 
1,964  | 
 
  | 
21,178  | 
 
  | 
23,142  | 
 
  | 
(3,257  | 
)  | 
2010  | 
1/20/2006  | 
 
Sentry Gateway - Y (O)  | 
San Antonio, TX  | 
—  | 
 
  | 
1,964  | 
 
  | 
21,298  | 
 
  | 
—  | 
 
  | 
1,964  | 
 
  | 
21,298  | 
 
  | 
23,262  | 
 
  | 
(3,277  | 
)  | 
2010  | 
1/20/2006  | 
 
Sentry Gateway - Z (O)  | 
San Antonio, TX  | 
—  | 
 
  | 
1,964  | 
 
  | 
30,573  | 
 
  | 
—  | 
 
  | 
1,964  | 
 
  | 
30,573  | 
 
  | 
32,537  | 
 
  | 
(1,379  | 
)  | 
2015  | 
6/14/2005  | 
 
  
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
   | 
   | 
   | 
Initial Cost  | 
   | 
Gross Amounts Carried                     At Close of Period  | 
   | 
   | 
   | 
 
Property (Type) (1)  | 
Location  | 
Encumbrances (2)  | 
Land  | 
Building     and Land Improvements  | 
Costs Capitalized Subsequent to Acquisition  | 
Land  | 
Building      and Land Improvements  | 
Total       (3)(4)  | 
Accumulated Depreciation (5)  | 
Year Built or Renovated  | 
Date Acquired (6)  | 
 
Westfields - Park Center (L)  | 
Chantilly, VA  | 
—  | 
 
  | 
16,418  | 
 
  | 
18,319  | 
 
  | 
—  | 
 
  | 
16,418  | 
 
  | 
18,319  | 
 
  | 
34,737  | 
 
  | 
—  | 
 
  | 
(8)  | 
7/18/2002  | 
 
Westfields Corporate Center (L)  | 
Chantilly, VA  | 
—  | 
 
  | 
7,141  | 
 
  | 
1,432  | 
 
  | 
—  | 
 
  | 
7,141  | 
 
  | 
1,432  | 
 
  | 
8,573  | 
 
  | 
—  | 
 
  | 
(8)  | 
7/31/2002  | 
 
White Marsh (L)  | 
White Marsh, MD  | 
—  | 
 
  | 
3,461  | 
 
  | 
309  | 
 
  | 
—  | 
 
  | 
3,461  | 
 
  | 
309  | 
 
  | 
3,770  | 
 
  | 
—  | 
 
  | 
(8)  | 
1/9/2007  | 
 
Woodland Park (L) (10)  | 
Herndon, VA  | 
—  | 
 
  | 
9,614  | 
 
  | 
108  | 
 
  | 
—  | 
 
  | 
9,614  | 
 
  | 
108  | 
 
  | 
9,722  | 
 
  | 
—  | 
 
  | 
(8)  | 
4/29/2004  | 
 
Other Developments, including intercompany eliminations (V)  | 
Various  | 
—  | 
 
  | 
7  | 
 
  | 
314  | 
 
  | 
252  | 
 
  | 
7  | 
 
  | 
566  | 
 
  | 
573  | 
 
  | 
(48  | 
)  | 
Various  | 
Various  | 
 
   | 
   | 
$  | 
168,368  | 
 
  | 
$  | 
662,081  | 
 
  | 
$  | 
2,857,561  | 
 
  | 
$  | 
355,073  | 
 
  | 
$  | 
662,081  | 
 
  | 
$  | 
3,212,634  | 
 
  | 
$  | 
3,874,715  | 
 
  | 
$  | 
(715,951  | 
)  | 
   | 
   | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
  
 
 | 
 | 
 
(1)   | 
A legend for the Property Type follows: (O) = Office Property; (L) = Land held or pre-construction; (D) = Data Center; and (V) = Various.  | 
 
 
 | 
 | 
 
(2)   | 
Excludes our term loan facilities of $547.5 million, unsecured senior notes of $1.2 billion, unsecured notes payable of $1.4 million, and deferred financing costs, net of premiums, on the remaining loans of $777,000.
  | 
 
 
 | 
 | 
 
(3)   | 
The aggregate cost of these assets for Federal income tax purposes was approximately $3.4 billion at December 31, 2016.
  | 
 
 
 | 
 | 
 
(4)   | 
As discussed in Note 3 to our Consolidated Financial Statements, we recognized impairment losses of $101.4 million primarily in connection with certain of our land and operating properties, including $78.6 million related to land and operating properties still owned as of December 31, 2016.
  | 
 
 
 | 
 | 
 
(5)   | 
The estimated lives over which depreciation is recognized follow:  Building and land improvements: 10-40 years; and tenant improvements: related lease terms.
  | 
 
 
 | 
 | 
 
(6)   | 
The acquisition date of multi-parcel properties reflects the date of the earliest parcel acquisition.  | 
 
 
 | 
 | 
 
(7)   | 
Under construction or redevelopment at December 31, 2016.
  | 
 
 
 | 
 | 
 
(8)   | 
Held or under pre-construction at December 31, 2016.
  | 
 
 
 | 
 | 
 
(9)  | 
The carrying amounts of these properties under construction exclude allocated costs of the garage being constructed to support the properties.  | 
 
 
 | 
 | 
 
(10)  | 
Classified as held for sale as of December 31, 2016.
  | 
 
 
 |  
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 | 
 
The following table summarizes our changes in cost of properties for the years ended December 31, 2016, 2015 and 2014 (in thousands):  |  
   | 
   | 
   | 
   | 
   | 
   | 
2016  | 
   | 
2015  | 
   | 
2014  | 
 
   | 
Beginning balance  | 
   | 
   | 
$  | 
4,158,616  | 
 
  | 
   | 
$  | 
4,014,336  | 
 
  | 
   | 
$  | 
3,811,950  | 
 
  | 
 
   | 
Acquisitions of operating properties  | 
   | 
   | 
—  | 
 
  | 
   | 
194,616  | 
 
  | 
   | 
—  | 
 
  | 
 
   | 
Improvements and other additions  | 
   | 
   | 
251,960  | 
 
  | 
   | 
273,761  | 
 
  | 
   | 
254,868  | 
 
  | 
 
   | 
Sales  | 
   | 
   | 
(268,038  | 
)  | 
   | 
(172,628  | 
)  | 
   | 
(48,466  | 
)  | 
 
   | 
Impairments  | 
   | 
   | 
(143,502  | 
)  | 
   | 
(29,548  | 
)  | 
   | 
(3,042  | 
)  | 
 
   | 
Other dispositions  | 
   | 
   | 
(124,321  | 
)  | 
   | 
(121,921  | 
)  | 
   | 
(974  | 
)  | 
 
   | 
Ending balance  | 
   | 
   | 
$  | 
3,874,715  | 
 
  | 
   | 
$  | 
4,158,616  | 
 
  | 
   | 
$  | 
4,014,336  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
The following table summarizes our changes in accumulated depreciation for the same time periods (in thousands):  |  
   | 
   | 
   | 
   | 
   | 
   | 
2016  | 
   | 
2015  | 
   | 
2014  | 
 
   | 
Beginning balance  | 
   | 
   | 
$  | 
718,680  | 
 
  | 
   | 
$  | 
703,083  | 
 
  | 
   | 
$  | 
597,649  | 
 
  | 
 
   | 
Depreciation expense  | 
   | 
   | 
105,763  | 
 
  | 
   | 
112,695  | 
 
  | 
   | 
111,326  | 
 
  | 
 
   | 
Sales  | 
   | 
   | 
(56,607  | 
)  | 
   | 
(49,614  | 
)  | 
   | 
(3,129  | 
)  | 
 
   | 
Impairments  | 
   | 
   | 
(42,161  | 
)  | 
   | 
(6,092  | 
)  | 
   | 
(1,671  | 
)  | 
 
   | 
Other dispositions  | 
   | 
   | 
(9,724  | 
)  | 
   | 
(41,392  | 
)  | 
   | 
(1,092  | 
)  | 
 
   | 
Ending balance  | 
   | 
   | 
$  | 
715,951  | 
 
  | 
   | 
$  | 
718,680  | 
 
  | 
   | 
$  | 
703,083  | 
 
  | 
 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
   | 
 
  
 
 |