Annual report pursuant to Section 13 and 15(d)

Schedule III - Real Estate and Accumulated Depreciation

v3.6.0.2
Schedule III - Real Estate and Accumulated Depreciation
12 Months Ended
Dec. 31, 2016
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, 2016
(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
$
50,244

$
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
 
 
 
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