Annual report pursuant to Section 13 and 15(d)

Schedule III - Real Estate and Accumulated Depreciation

v3.3.1.900
Schedule III - Real Estate and Accumulated Depreciation
12 Months Ended
Dec. 31, 2015
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]  
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, 2015
(Dollars in thousands)
 
 
 
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
$
50,732

$
26,715

$
58,343

$
55

$
26,715

$
58,398

$
85,113

$
(1,588
)
1973
8/7/2015
1000 Redstone Gateway (O)
Huntsville, AL
11,370


20,533



20,533

20,533

(1,438
)
2013
3/23/2010
1100 Redstone Gateway (O)
Huntsville, AL
11,791


19,593



19,593

19,593

(965
)
2014
3/23/2010
114 National Business Parkway (O)
Annapolis Junction, MD

364

3,109

60

364

3,169

3,533

(1,125
)
2002
6/30/2000
11751 Meadowville Lane (O)
Richmond, VA

1,305

52,098

112

1,305

52,210

53,515

(11,194
)
2007
9/15/2006
1200 Redstone Gateway (O)
Huntsville, AL
13,639


22,389



22,389

22,389

(1,145
)
2013
3/23/2010
1201 M Street (O)
Washington, DC


49,785

4,225


54,010

54,010

(8,947
)
2001
9/28/2010
1201 Winterson Road (O)
Linthicum, MD

1,288

12,175

460

1,288

12,635

13,923

(3,824
)
1985 (7)
4/30/1998
1220 12th Street, SE (O)
Washington, DC


42,464

2,431


44,895

44,895

(8,523
)
2003
9/28/2010
1243 Winterson Road (L)
Linthicum, MD

630



630


630


(8)
12/19/2001
1302 Concourse Drive (O)
Linthicum, MD

2,078

8,313

6,559

2,078

14,872

16,950

(6,188
)
1996
11/18/1999
1304 Concourse Drive (O)
Linthicum, MD

1,999

12,934

2,884

1,999

15,818

17,817

(6,360
)
2002
11/18/1999
1306 Concourse Drive (O)
Linthicum, MD

2,796

11,186

8,152

2,796

19,338

22,134

(6,922
)
1990
11/18/1999
131 National Business Parkway (O)
Annapolis Junction, MD

1,906

7,623

3,524

1,906

11,147

13,053

(5,596
)
1990
9/28/1998
132 National Business Parkway (O)
Annapolis Junction, MD

2,917

12,259

3,005

2,917

15,264

18,181

(7,700
)
2000
5/28/1999
133 National Business Parkway (O)
Annapolis Junction, MD

2,517

10,068

5,204

2,517

15,272

17,789

(8,230
)
1997
9/28/1998
1331 Ashton Road (O)
Hanover, MD

587

2,347

1,575

587

3,922

4,509

(1,337
)
1989
4/28/1999
1334 Ashton Road (O)
Hanover, MD

736

1,488

2,639

736

4,127

4,863

(2,467
)
1989
4/28/1999
134 National Business Parkway (O)
Annapolis Junction, MD

3,684

7,517

3,496

3,684

11,013

14,697

(4,062
)
1999
11/13/1998
1340 Ashton Road (O)
Hanover, MD

905

3,620

1,469

905

5,089

5,994

(2,621
)
1989
4/28/1999
1341 Ashton Road (O)
Hanover, MD

306

1,223

604

306

1,827

2,133

(932
)
1989
4/28/1999
1343 Ashton Road (O)
Hanover, MD

193

774

405

193

1,179

1,372

(640
)
1989
4/28/1999
13450 Sunrise Valley Road (O)
Herndon, VA

1,386

5,576

3,335

1,386

8,911

10,297

(3,902
)
1998
7/25/2003
13454 Sunrise Valley Road (O)
Herndon, VA

2,899

11,986

6,750

2,899

18,736

21,635

(7,177
)
1998
7/25/2003
135 National Business Parkway (O)
Annapolis Junction, MD
11,125

2,484

9,750

5,700

2,484

15,450

17,934

(6,467
)
1998
12/30/1998
1362 Mellon Road (O)
Hanover, MD

1,706

8,670

182

1,706

8,852

10,558

(1,517
)
2006
2/10/2006
13857 McLearen Road (O)
Herndon, VA

3,507

30,177

1,565

3,507

31,742

35,249

(6,961
)
2007
7/11/2012
140 National Business Parkway (O)
Annapolis Junction, MD

3,407

24,167

688

3,407

24,855

28,262

(7,647
)
2003
12/31/2003
141 National Business Parkway (O)
Annapolis Junction, MD
11,566

2,398

9,590

3,194

2,398

12,784

15,182

(5,963
)
1990
9/28/1998
14280 Park Meadow Drive (O)
Chantilly, VA

3,731

15,953

1,764

3,731

17,717

21,448

(6,185
)
1999
9/29/2004
1460 Dorsey Road (L)
Hanover, MD

1,800



1,800


1,800


(8)
2/28/2006
14840 Conference Center Drive (O)
Chantilly, VA

1,572

8,175

2,860

1,572

11,035

12,607

(4,320
)
2000
7/25/2003
14850 Conference Center Drive (O)
Chantilly, VA

1,615

8,358

2,947

1,615

11,305

12,920

(4,646
)
2000
7/25/2003
14900 Conference Center Drive (O)
Chantilly, VA

3,436

14,402

5,239

3,436

19,641

23,077

(8,221
)
1999
7/25/2003
 
 
 
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)
1501 South Clinton Street (O)
Baltimore, MD

27,964

52,146

8,165

27,964

60,311

88,275

(14,472
)
2006
10/27/2009
15049 Conference Center Drive (O)
Chantilly, VA

4,415

20,365

3,619

4,415

23,984

28,399

(9,236
)
1997
8/14/2002
15059 Conference Center Drive (O)
Chantilly, VA

5,753

13,615

2,065

5,753

15,680

21,433

(6,697
)
2000
8/14/2002
15395 John Marshall Highway (O)
Haymarket, VA

2,465

24,768


2,465

24,768

27,233

(1,195
)
2014
5/7/2013
1550 West Nursery Road (O)
Linthicum, MD

14,071

16,930


14,071

16,930

31,001

(3,626
)
2009
10/28/2009
1560 West Nursery Road (O)
Linthicum, MD

1,441

113


1,441

113

1,554

(5
)
2014
10/28/2009
1560A Cable Ranch Road (O) (10)
San Antonio, TX

1,097

3,770

394

1,097

4,164

5,261

(1,298
)
1985/2007
6/19/2008
1560B Cable Ranch Road (O) (10)
San Antonio, TX

2,299

6,545

159

2,299

6,704

9,003

(1,738
)
1985/2006
6/19/2008
16442 Commerce Drive (O)
Dahlgren, VA

613

2,582

883

613

3,465

4,078

(1,332
)
2002
12/21/2004
16480 Commerce Drive (O)
Dahlgren, VA

1,856

7,425

1,283

1,856

8,708

10,564

(2,316
)
2000
12/28/2004
16501 Commerce Drive (O)
Dahlgren, VA

522

2,090

482

522

2,572

3,094

(797
)
2002
12/21/2004
16539 Commerce Drive (O)
Dahlgren, VA

688

2,860

1,524

688

4,384

5,072

(1,934
)
1990
12/21/2004
16541 Commerce Drive (O)
Dahlgren, VA

773

3,094

1,368

773

4,462

5,235

(1,727
)
1996
12/21/2004
16543 Commerce Drive (O)
Dahlgren, VA

436

1,742

502

436

2,244

2,680

(573
)
2002
12/21/2004
1751 Pinnacle Drive (O)
McLean, VA

10,486

42,339

24,059

10,486

66,398

76,884

(23,750
)
1989/1995
9/23/2004
1753 Pinnacle Drive (O)
McLean, VA

8,275

34,353

10,894

8,275

45,247

53,522

(15,849
)
1976/2004
9/23/2004
201 Technology Drive (O)
Lebanon, VA

726

31,091

59

726

31,150

31,876

(6,358
)
2007
10/5/2007
206 Research Boulevard (O)
Aberdeen, MD

1,813

17,485


1,813

17,485

19,298

(1,416
)
2012
9/14/2007
209 Research Boulevard (O)
Aberdeen, MD

1,045

16,087

79

1,045

16,166

17,211

(2,069
)
2010
9/14/2007
210 Research Boulevard (O)
Aberdeen, MD

1,065

15,102

75

1,065

15,177

16,242

(1,569
)
2010
9/14/2007
2100 L Street (L)
Washington, DC

1,273

1,685


1,273

1,685

2,958


(8)
8/11/2015
2100 Rideout Road (O)
Huntsville, AL


2,586



2,586

2,586


(7)
3/23/2010
21267 Smith Switch Road (O)
Ashburn, VA

4,040

10,135


4,040

10,135

14,175

(365
)
2014
12/27/2012
21271 Smith Switch Road (O)
Ashburn, VA

7,346

18,267


7,346

18,267

25,613

(881
)
2013
12/27/2012
22289 Exploration Drive (O)
Lexington Park, MD

1,422

5,719

1,660

1,422

7,379

8,801

(2,826
)
2000
3/24/2004
22299 Exploration Drive (O)
Lexington Park, MD

1,362

5,791

1,218

1,362

7,009

8,371

(2,641
)
1998
3/24/2004
22300 Exploration Drive (O)
Lexington Park, MD

1,094

5,038

1,315

1,094

6,353

7,447

(2,024
)
1997
11/9/2004
22309 Exploration Drive (O)
Lexington Park, MD

2,243

10,419

7,787

2,243

18,206

20,449

(4,683
)
1984/1997
3/24/2004
23535 Cottonwood Parkway (O)
California, MD

692

3,051

248

692

3,299

3,991

(1,206
)
1984
3/24/2004
250 W Pratt St (O)
Baltimore, MD

8,057

34,654

4,765

8,057

39,419

47,476

(1,652
)
1985
3/19/2015
2500 Riva Road (O)
Annapolis, MD

2,791

12,145

1

2,791

12,146

14,937

(4,417
)
2000
3/4/2003
2600 Park Tower Drive (O)
Vienna, VA

20,304

34,443

346

20,304

34,789

55,093

(1,051
)
1999
4/15/2015
2691 Technology Drive (O)
Annapolis Junction, MD

2,098

17,334

5,305

2,098

22,639

24,737

(7,827
)
2005
5/26/2000
2701 Technology Drive (O)
Annapolis Junction, MD
22,053

1,737

15,266

2,821

1,737

18,087

19,824

(7,567
)
2001
5/26/2000
2711 Technology Drive (O)
Annapolis Junction, MD
17,153

2,251

21,611

1,468

2,251

23,079

25,330

(10,158
)
2002
11/13/2000
2720 Technology Drive (O)
Annapolis Junction, MD

3,863

29,272

146

3,863

29,418

33,281

(8,316
)
2004
1/31/2002
2721 Technology Drive (O)
Annapolis Junction, MD

4,611

14,597

1,263

4,611

15,860

20,471

(6,400
)
2000
10/21/1999
2730 Hercules Road (O)
Annapolis Junction, MD
34,256

8,737

31,612

7,213

8,737

38,825

47,562

(15,674
)
1990
9/28/1998
2900 Towerview Road (O)
Herndon, VA

3,207

16,379

6,509

3,207

22,888

26,095

(7,181
)
1982/2008
12/20/2005
 
 
 
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)
30 Light Street (O)
Baltimore, MD
4,268


12,101

37


12,138

12,138

(128
)
2009
8/7/2015
300 Sentinel Drive (O)
Annapolis Junction, MD

1,517

59,016

219

1,517

59,235

60,752

(8,458
)
2009
11/14/2003
302 Sentinel Drive (O)
Annapolis Junction, MD

2,648

29,687

445

2,648

30,132

32,780

(6,000
)
2007
11/14/2003
304 Sentinel Drive (O)
Annapolis Junction, MD

3,411

24,917

193

3,411

25,110

28,521

(6,304
)
2005
11/14/2003
306 Sentinel Drive (O)
Annapolis Junction, MD
15,878

3,260

22,592

611

3,260

23,203

26,463

(5,269
)
2006
11/14/2003
308 Sentinel Drive (O)
Annapolis Junction, MD

1,422

26,208

37

1,422

26,245

27,667

(3,050
)
2010
11/14/2003
310 Sentinel Way (O)
Annapolis Junction, MD

2,372

36,468


2,372

36,468

38,840

(191
)
(7)
11/14/2003
310 The Bridge Street (O)
Huntsville, AL

261

26,531

1,695

261

28,226

28,487

(5,136
)
2009
8/9/2011
312 Sentinel Way (O)
Annapolis Junction, MD

3,138

27,789


3,138

27,789

30,927

(913
)
2014
11/14/2003
3120 Fairview Park Drive (O)
Falls Church, VA

6,863

35,606

8,773

6,863

44,379

51,242

(7,229
)
2008
11/23/2010
314 Sentinel Way (O)
Annapolis Junction, MD

1,254

1,439


1,254

1,439

2,693

(249
)
2008
11/14/2003
316 Sentinel Way (O)
Annapolis Junction, MD

2,748

38,156

138

2,748

38,294

41,042

(3,570
)
2011
11/14/2003
318 Sentinel Way (O)
Annapolis Junction, MD

2,185

28,426


2,185

28,426

30,611

(6,981
)
2005
11/14/2003
320 Sentinel Way (O)
Annapolis Junction, MD

2,067

21,623


2,067

21,623

23,690

(4,310
)
2007
11/14/2003
322 Sentinel Way (O)
Annapolis Junction, MD
21,122

2,605

22,827


2,605

22,827

25,432

(5,143
)
2006
11/14/2003
324 Sentinel Way (O)
Annapolis Junction, MD

1,656

23,018


1,656

23,018

24,674

(3,078
)
2010
6/29/2006
410 National Business Parkway (O)
Annapolis Junction, MD

1,831

23,257

112

1,831

23,369

25,200

(1,719
)
2012
6/29/2006
420 National Business Parkway (O)
Annapolis Junction, MD

2,370

27,490

106

2,370

27,596

29,966

(1,230
)
2013
6/29/2006
430 National Business Parkway (O)
Annapolis Junction, MD

1,852

21,153

119

1,852

21,272

23,124

(2,034
)
2011
6/29/2006
44408 Pecan Court (O)
California, MD

817

1,583

581

817

2,164

2,981

(560
)
1986
3/24/2004
44414 Pecan Court (O)
California, MD

405

1,619

337

405

1,956

2,361

(725
)
1986
3/24/2004
44417 Pecan Court (O)
California, MD

434

3,348

88

434

3,436

3,870

(1,127
)
1989/2015
3/24/2004
44420 Pecan Court (O)
California, MD

344

890

148

344

1,038

1,382

(255
)
1989
11/9/2004
44425 Pecan Court (O)
California, MD

1,309

3,506

1,590

1,309

5,096

6,405

(1,784
)
1997
5/5/2004
45310 Abell House Lane (O)
California, MD

2,272

13,808


2,272

13,808

16,080

(1,403
)
2011
8/30/2010
46579 Expedition Drive (O)
Lexington Park, MD

1,406

5,796

1,335

1,406

7,131

8,537

(3,060
)
2002
3/24/2004
46591 Expedition Drive (O)
Lexington Park, MD

1,200

7,199

1,134

1,200

8,333

9,533

(1,933
)
2005
3/24/2004
4851 Stonecroft Boulevard (O)
Chantilly, VA

1,878

11,558

21

1,878

11,579

13,457

(3,248
)
2004
8/14/2002
4940 Campbell Drive (O) (10)
White Marsh, MD

1,379

2,728

1,464

1,379

4,192

5,571

(445
)
1990
1/9/2007
525 Babcock Road (O)
Colorado Springs, CO

355

397

79

355

476

831

(173
)
1967
7/12/2007
5325 Nottingham Drive (O)
White Marsh, MD

816

3,976

485

816

4,461

5,277

(1,233
)
2002
1/9/2007
5355 Nottingham Drive (O)
White Marsh, MD

761

3,562

1,758

761

5,320

6,081

(2,132
)
2005
1/9/2007
540 National Business Parkway (O)
Annapolis Junction, MD

2,035

9,496


2,035

9,496

11,531


(7)
6/29/2006
5520 Research Park Drive (O)
Catonsville, MD


20,072

201


20,273

20,273

(3,195
)
2009
4/4/2006
5522 Research Park Drive (O)
Catonsville, MD


4,550



4,550

4,550

(955
)
2007
3/8/2006
5825 University Research Court (O)
College Park, MD
15,255


22,740

87


22,827

22,827

(3,817
)
2008
1/29/2008
5850 University Research Court (O)
College Park, MD
20,771


31,906

406


32,312

32,312

(4,580
)
2008
1/29/2008
6700 Alexander Bell Drive (O)
Columbia, MD

1,755

7,019

6,226

1,755

13,245

15,000

(5,913
)
1988
5/14/2001
6708 Alexander Bell Drive (O)
Columbia, MD

897

8,844

1,591

897

10,435

11,332

(3,414
)
1988 (7)
5/14/2001
 
 
 
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)
6711 Columbia Gateway Drive (O)
Columbia, MD

2,683

23,239

619

2,683

23,858

26,541

(5,407
)
2006-2007
9/28/2000
6716 Alexander Bell Drive (O)
Columbia, MD

1,242

4,969

3,352

1,242

8,321

9,563

(4,359
)
1990
12/31/1998
6721 Columbia Gateway Drive (O)
Columbia, MD
16,663

1,753

34,090

76

1,753

34,166

35,919

(5,798
)
2009
9/28/2000
6724 Alexander Bell Drive (O)
Columbia, MD

449

5,039

708

449

5,747

6,196

(2,266
)
2001
5/14/2001
6731 Columbia Gateway Drive (O)
Columbia, MD

2,807

19,098

2,916

2,807

22,014

24,821

(8,494
)
2002
3/29/2000
6740 Alexander Bell Drive (O)
Columbia, MD

1,424

5,696

3,340

1,424

9,036

10,460

(5,058
)
1992
12/31/1998
6741 Columbia Gateway Drive (O)
Columbia, MD

675

1,711

124

675

1,835

2,510

(357
)
2008
9/28/2000
6750 Alexander Bell Drive (O)
Columbia, MD

1,263

12,461

3,457

1,263

15,918

17,181

(7,576
)
2001
12/31/1998
6760 Alexander Bell Drive (O)
Columbia, MD

890

3,561

2,974

890

6,535

7,425

(3,248
)
1991
12/31/1998
6940 Columbia Gateway Drive (O)
Columbia, MD

3,545

9,916

5,537

3,545

15,453

18,998

(7,000
)
1999
11/13/1998
6950 Columbia Gateway Drive (O)
Columbia, MD

3,596

14,269

3,087

3,596

17,356

20,952

(7,506
)
1998
10/22/1998
7000 Columbia Gateway Drive (O)
Columbia, MD

3,131

12,103

2,138

3,131

14,241

17,372

(4,482
)
1999
5/31/2002
7005 Columbia Gateway Drive (O)
Columbia, MD

3,036

189


3,036

189

3,225


(8)
6/26/2014
7015 Albert Einstein Drive (O)
Columbia, MD
1,570

2,058

6,093

1,527

2,058

7,620

9,678

(2,915
)
1999
12/1/2005
7061 Columbia Gateway Drive (O)
Columbia, MD

729

3,094

1,407

729

4,501

5,230

(1,802
)
2000
8/30/2001
7063 Columbia Gateway Drive (O)
Columbia, MD

902

3,684

2,512

902

6,196

7,098

(2,452
)
2000
8/30/2001
7065 Columbia Gateway Drive (O)
Columbia, MD

919

3,763

3,095

919

6,858

7,777

(2,773
)
2000
8/30/2001
7067 Columbia Gateway Drive (O)
Columbia, MD

1,829

11,823

2,838

1,829

14,661

16,490

(6,154
)
2001
8/30/2001
7125 Columbia Gateway Drive (L)
Columbia, MD

3,361

1,677

279

3,361

1,956

5,317


1973/1999 (8)
6/29/2006
7125 Columbia Gateway Drive (O)
Columbia, MD

17,126

46,994

9,813

17,126

56,807

73,933

(16,632
)
1973/1999
6/29/2006
7130 Columbia Gateway Drive (O)
Columbia, MD

1,350

4,359

1,906

1,350

6,265

7,615

(2,692
)
1989
9/19/2005
7134 Columbia Gateway Drive (O)
Columbia, MD

704

2,139

314

704

2,453

3,157

(1,234
)
1990 (7)
9/19/2005
7138 Columbia Gateway Drive (O)
Columbia, MD

1,104

3,518

2,118

1,104

5,636

6,740

(3,139
)
1990
9/19/2005
7142 Columbia Gateway Drive (O)
Columbia, MD

1,342

3,978

2,502

1,342

6,480

7,822

(2,322
)
1994
9/19/2005
7150 Columbia Gateway Drive (O)
Columbia, MD

1,032

3,429

665

1,032

4,094

5,126

(1,170
)
1991
9/19/2005
7150 Riverwood Drive (O)
Columbia, MD

1,821

4,388

1,713

1,821

6,101

7,922

(1,933
)
2000
1/10/2007
7160 Riverwood Drive (O)
Columbia, MD

2,732

7,006

2,275

2,732

9,281

12,013

(3,265
)
2000
1/10/2007
7170 Riverwood Drive (O)
Columbia, MD

1,283

3,096

692

1,283

3,788

5,071

(1,386
)
2000
1/10/2007
7175 Riverwood Drive (O)
Columbia, MD

1,788

7,269


1,788

7,269

9,057

(389
)
1996/2013
7/27/2005
7200 Redstone Gateway (O)
Huntsville, AL
6,649


8,347



8,347

8,347

(328
)
2013
3/23/2010
7200 Riverwood Road (O)
Columbia, MD

4,089

22,544

3,994

4,089

26,538

30,627

(8,761
)
1986
10/13/1998
7205 Riverwood Drive (O)
Columbia, MD

1,367

21,484


1,367

21,484

22,851

(1,310
)
2013
7/27/2005
7272 Park Circle Drive (O)
Hanover, MD
4,747

1,479

6,300

3,883

1,479

10,183

11,662

(2,956
)
1991/1996
1/10/2007
7318 Parkway Drive (O)
Hanover, MD

972

3,888

1,002

972

4,890

5,862

(2,084
)
1984
4/16/1999
7320 Parkway Drive (O)
Hanover, MD

905

3,570

5,048

905

8,618

9,523

(2,883
)
1983
4/4/2002
7400 Redstone Gateway (O)
Huntsville, AL
7,292


9,012



9,012

9,012

(121
)
2015
3/23/2010
7467 Ridge Road (O)
Hanover, MD

1,629

6,517

3,645

1,629

10,162

11,791

(4,439
)
1990
4/28/1999
7740 Milestone Parkway (O)
Hanover, MD
18,987

3,825

34,176

404

3,825

34,580

38,405

(4,692
)
2009
7/2/2007
7770 Backlick Road (O)
Springfield, VA

6,387

74,325

141

6,387

74,466

80,853

(5,292
)
2012
3/10/2010
 
 
 
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)
7880 Milestone Parkway (O)
Hanover, MD

4,857

23,647


4,857

23,647

28,504

(215
)
2015 (7)
9/17/2013
8003 Corporate Drive (O) (10)
White Marsh, MD

611

1,126

685

611

1,811

2,422

(99
)
1999
1/9/2007
8007 Corporate Drive (O) (10)
White Marsh, MD

1,434

350

1,218

1,434

1,568

3,002

(278
)
1995
1/9/2007
8010 Corporate Drive (O) (10)
White Marsh, MD

1,349

3,262

1,744

1,349

5,006

6,355

(1,448
)
1998
1/9/2007
8013 Corporate Drive (O) (10)
White Marsh, MD

642

1,072

1,808

642

2,880

3,522

(519
)
1990
1/9/2007
8015 Corporate Drive (O) (10)
White Marsh, MD

446

1,116

466

446

1,582

2,028

(468
)
1990
1/9/2007
8019 Corporate Drive (O) (10)
White Marsh, MD

680

1,898

825

680

2,723

3,403

(827
)
1990
1/9/2007
8020 Corporate Drive (O) (10)
White Marsh, MD

2,184

3,767

2,205

2,184

5,972

8,156

(1,703
)
1997
1/9/2007
8023 Corporate Drive (O) (10)
White Marsh, MD

651

1,164

5

651

1,169

1,820

(47
)
1990
1/9/2007
8094 Sandpiper Circle (O) (10)
White Marsh, MD

1,960

3,716

1,129

1,960

4,845

6,805

(1,267
)
1998
1/9/2007
8098 Sandpiper Circle (O) (10)
White Marsh, MD

1,797

3,651

639

1,797

4,290

6,087

(929
)
1998
1/9/2007
8110 Corporate Drive (O) (10)
White Marsh, MD

2,285

10,117

989

2,285

11,106

13,391

(3,133
)
2001
1/9/2007
8140 Corporate Drive (O) (10)
White Marsh, MD

2,158

8,457

3,163

2,158

11,620

13,778

(4,117
)
2003
1/9/2007
8621 Robert Fulton Drive (O)
Columbia, MD

2,317

12,642

344

2,317

12,986

15,303

(3,378
)
2005-2006
6/10/2005
8661 Robert Fulton Drive (O)
Columbia, MD

1,510

3,764

2,420

1,510

6,184

7,694

(2,117
)
2002
12/30/2003
8671 Robert Fulton Drive (O)
Columbia, MD

1,718

4,280

3,931

1,718

8,211

9,929

(3,060
)
2002
12/30/2003
870 Elkridge Landing Road (O)
Linthicum, MD

2,003

9,442

7,616

2,003

17,058

19,061

(8,411
)
1981
8/3/2001
891 Elkridge Landing Road (O)
Linthicum, MD

1,165

4,772

2,928

1,165

7,700

8,865

(3,488
)
1984
7/2/2001
900 Elkridge Landing Road (O)
Linthicum, MD

1,993

7,972

3,603

1,993

11,575

13,568

(6,009
)
1982
4/30/1998
901 Elkridge Landing Road (O)
Linthicum, MD

1,156

4,437

2,390

1,156

6,827

7,983

(3,015
)
1984
7/2/2001
911 Elkridge Landing Road (O)
Linthicum, MD

1,215

4,861

2,024

1,215

6,885

8,100

(3,462
)
1985
4/30/1998
921 Elkridge Landing Road (O)
Linthicum, MD

1,044

4,727

748

1,044

5,475

6,519

(4,924
)
1983 (7)
4/30/1998
938 Elkridge Landing Road (O)
Linthicum, MD

922

4,748

1,263

922

6,011

6,933

(2,116
)
1984
7/2/2001
939 Elkridge Landing Road (O)
Linthicum, MD

939

3,756

4,245

939

8,001

8,940

(3,337
)
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

249,706

985

6,050

250,691

256,741

(18,119
)
2010
9/14/2010
Aerotech Commerce (L)
Colorado Springs, CO

900



900


900


(8)
5/19/2006
Arborcrest (O)
Blue Bell, PA

21,968

122,759

1,301

21,968

124,060

146,028

(25,901
)
1991-96/2015
10/14/1997
Arundel Preserve (L)
Hanover, MD

13,401

9,331


13,401

9,331

22,732


(8)
7/2/2007
Ashburn Crossing - DC10 (O)
Ashburn, VA

4,408

10,689


4,408

10,689

15,097

(225
)
2015
12/27/2012
Canton Crossing Land (L)
Baltimore, MD

16,085

2,134


16,085

2,134

18,219


(8)
10/27/2009
Canton Crossing Util Distr Ctr (O)
Baltimore, MD

7,300

15,556

942

7,300

16,498

23,798

(3,326
)
2006
10/27/2009
Columbia Gateway - Southridge (L)
Columbia, MD

6,387

3,539


6,387

3,539

9,926


(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

728


705

728

1,433


(8)
3/24/2004
InterQuest (L) (10)
Colorado Springs, CO

8,201



8,201


8,201


(8)
9/28/2005
M Square Research Park (L)
College Park, MD


2,986



2,986

2,986


(8)
1/29/2008
National Business Park North (L)
Annapolis Junction, MD

28,066

41,936


28,066

41,936

70,002


(8)
6/29/2006
North Gate Business Park (L)
Aberdeen, MD

6,309

4,540


6,309

4,540

10,849


(8)
9/14/2007
 
 
 
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)
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

47,364


2,096

47,364

49,460

(1,046
)
2015
7/31/2002
NOVA Office B (O) (9)
Chantilly, VA

739

26,277


739

26,277

27,016


(7)
7/31/2002
NOVA Office D (O)
Chantilly, VA

6,587

103


6,587

103

6,690


(7)
7/31/2002
Old Annapolis Road (O)
Columbia, MD

1,637

5,500

3,457

1,637

8,957

10,594

(2,983
)
1974/1985
12/14/2000
Patriot Park (L)
Colorado Springs, CO

2,328

1


2,328

1

2,329


(8)
7/8/2005
Patriot Point - DC15 (O)
Ashburn, VA

12,156

7,112


12,156

7,112

19,268


(7)
10/15/2015
Patriot Point - DC16 (O)
Ashburn, VA

12,156

4,110


12,156

4,110

16,266


(7)
10/15/2015
Patriot Point - DC17 (O)
Ashburn, VA

6,078

472


6,078

472

6,550


(7)
10/15/2015
Patriot Ridge (L)
Springfield, VA

18,517

14,423


18,517

14,423

32,940


(8)
3/10/2010
Redstone Gateway (L)
Huntsville, AL


14,250



14,250

14,250


(8)
3/23/2010
Route 15/Biggs Ford Road (L)
Frederick, MD

8,703

596


8,703

596

9,299


(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

(8,618
)
1982/1985
3/30/2005
Sentry Gateway - V (O)
San Antonio, TX


1,066



1,066

1,066

(188
)
2007
3/30/2005
Sentry Gateway - W (O)
San Antonio, TX


1,884



1,884

1,884

(296
)
2009
3/30/2005
Sentry Gateway - X (O)
San Antonio, TX

1,964

21,178


1,964

21,178

23,142

(2,728
)
2010
1/20/2006
Sentry Gateway - Y (O)
San Antonio, TX

1,964

21,298


1,964

21,298

23,262

(2,745
)
2010
1/20/2006
Sentry Gateway - Z (O)
San Antonio, TX

1,964

30,335


1,964

30,335

32,299

(616
)
2015
6/14/2005
Southpoint Manassas - DC12 (O)
Manassas, VA

4,518

12,701


4,518

12,701

17,219

(127
)
2015
2/6/2015
Southpoint Manassas - DC14 (O)
Manassas, VA

4,518

13,009


4,518

13,009

17,527

(101
)
2015
2/6/2015
Westfields - Park Center (L)
Chantilly, VA

16,418

7,488


16,418

7,488

23,906


(8)
7/18/2002
Westfields Corporate Center (L)
Chantilly, VA

7,141

1,423


7,141

1,423

8,564


(8)
7/31/2002
White Marsh (L)
White Marsh, MD

7,852

2,570


7,852

2,570

10,422


(8)
1/9/2007
Woodland Park (L) (10)
Herndon, VA

9,614

85


9,614

85

9,699


(8)
4/29/2004
Other Developments, including intercompany eliminations (V)
Various

94

34

431

94

465

559

(39
)
Various
Various
 
 
$
316,887

$
709,953

$
3,106,271

$
342,392

$
709,953

$
3,448,663

$
4,158,616

$
(718,680
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(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 Revolving Credit Facility of $43.5 million, term loan facilities of $515.9 million, unsecured senior notes of $1.2 billion, unsecured notes payable of $1.5 million, a letter of credit on a mortgage loan of $14.8 million, and deferred financing costs, net of premiums, on the remaining loans of $668,000.
(3)
The aggregate cost of these assets for Federal income tax purposes was approximately $3.5 billion at December 31, 2015.
(4)
As discussed in Note 3 to our Consolidated Financial Statements, we recognized impairment losses of $23.5 million primarily in connection with certain of our land and operating properties, including $22.0 million related to land and operating properties still owned as of December 31, 2015.
(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, 2015.
(8)
Held or under pre-construction at December 31, 2015.
(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, 2015.
The following table summarizes our changes in cost of properties for the years ended December 31, 2015, 2014 and 2013 (in thousands):
 
 
 
 
 
 
2015
 
2014
 
2013
 
Beginning balance
 
 
$
4,014,336

 
$
3,811,950

 
$
3,859,960

 
Acquisitions of operating properties
 
 
194,616

 

 

 
Improvements and other additions
 
 
273,761

 
254,868

 
249,639

 
Sales
 
 
(172,628
)
 
(48,466
)
 
(141,045
)
 
Impairments
 
 
(29,548
)
 
(3,042
)
 
(45,931
)
 
Other dispositions
 
 
(121,921
)
 
(974
)
 
(110,673
)
 
Ending balance
 
 
$
4,158,616

 
$
4,014,336

 
$
3,811,950

 
 
 
 
 
 
 
 
 
 
 
The following table summarizes our changes in accumulated depreciation for the same time periods (in thousands):
 
 
 
 
 
 
2015
 
2014
 
2013
 
Beginning balance
 
 
$
703,083

 
$
597,649

 
$
568,176

 
Depreciation expense
 
 
112,695

 
111,326

 
92,677

 
Sales
 
 
(49,614
)
 
(3,129
)
 
(9,542
)
 
Impairments
 
 
(6,092
)
 
(1,671
)
 
(14,863
)
 
Other dispositions
 
 
(41,392
)
 
(1,092
)
 
(38,799
)
 
Ending balance
 
 
$
718,680

 
$
703,083

 
$
597,649