Annual report pursuant to Section 13 and 15(d)

Schedule III - Real Estate and Accumulated Depreciation

v2.4.1.9
Schedule III - Real Estate and Accumulated Depreciation
12 Months Ended
Dec. 31, 2014
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, 2014
(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)
1000 Redstone Gateway (O)
Huntsville, AL
$
11,671

$

$
20,527

$

$

$
20,527

$
20,527

$
(924
)
2013
3/23/2010
1100 Redstone Gateway (O)
Huntsville, AL
12,057


19,501



19,501

19,501

(476
)
2014
3/23/2010
114 National Business Parkway (O)
Annapolis Junction, MD

364

3,109

46

364

3,155

3,519

(1,042
)
2002
6/30/2000
11751 Meadowville Lane (O)
Richmond, VA

1,305

52,098

112

1,305

52,210

53,515

(9,889
)
2007
9/15/2006
1200 Redstone Gateway (O)
Huntsville, AL
13,950


22,409



22,409

22,409

(586
)
2013
3/23/2010
1201 M Street (O)
Washington, DC


49,785

2,455


52,240

52,240

(7,255
)
2001
9/28/2010
1201 Winterson Road (O)
Linthicum, MD

1,288

5,452

460

1,288

5,912

7,200

(2,388
)
1985 (7)
4/30/1998
1220 12th Street, SE (O)
Washington, DC


42,464

2,014


44,478

44,478

(7,143
)
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

5,008

2,078

13,321

15,399

(5,610
)
1996
11/18/1999
1304 Concourse Drive (O)
Linthicum, MD

1,999

12,934

2,594

1,999

15,528

17,527

(5,680
)
2002
11/18/1999
1306 Concourse Drive (O)
Linthicum, MD

2,796

11,186

5,745

2,796

16,931

19,727

(6,097
)
1990
11/18/1999
131 National Business Parkway (O)
Annapolis Junction, MD

1,906

7,623

3,288

1,906

10,911

12,817

(4,807
)
1990
9/28/1998
132 National Business Parkway (O)
Annapolis Junction, MD

2,917

12,259

2,977

2,917

15,236

18,153

(7,314
)
2000
5/28/1999
13200 Woodland Park Road (O)
Herndon, VA

10,428

41,711

13,985

10,428

55,696

66,124

(24,106
)
2002
6/2/2003
133 National Business Parkway (O)
Annapolis Junction, MD

2,517

10,068

4,920

2,517

14,988

17,505

(7,560
)
1997
9/28/1998
1331 Ashton Road (O)
Hanover, MD

587

2,347

1,474

587

3,821

4,408

(1,154
)
1989
4/28/1999
1334 Ashton Road (O)
Hanover, MD

736

1,488

2,634

736

4,122

4,858

(2,055
)
1989
4/28/1999
134 National Business Parkway (O)
Annapolis Junction, MD

3,684

7,517

1,282

3,684

8,799

12,483

(3,765
)
1999
11/13/1998
1340 Ashton Road (O)
Hanover, MD

905

3,620

1,466

905

5,086

5,991

(2,431
)
1989
4/28/1999
1341 Ashton Road (O)
Hanover, MD

306

1,223

601

306

1,824

2,130

(860
)
1989
4/28/1999
1343 Ashton Road (O)
Hanover, MD

193

774

405

193

1,179

1,372

(596
)
1989
4/28/1999
13450 Sunrise Valley Road (O)
Herndon, VA

1,386

5,576

3,335

1,386

8,911

10,297

(3,580
)
1998
7/25/2003
13454 Sunrise Valley Road (O)
Herndon, VA

2,899

11,986

5,447

2,899

17,433

20,332

(6,255
)
1998
7/25/2003
135 National Business Parkway (O)
Annapolis Junction, MD
11,418

2,484

9,750

4,742

2,484

14,492

16,976

(5,845
)
1998
12/30/1998
1362 Mellon Road (O)
Hanover, MD

1,706

8,670

119

1,706

8,789

10,495

(1,278
)
2006
2/10/2006
13857 McLearen Road (O)
Herndon, VA

3,507

30,177

1,557

3,507

31,734

35,241

(4,945
)
2007
7/11/2012
140 National Business Parkway (O)
Annapolis Junction, MD

3,407

24,167

643

3,407

24,810

28,217

(7,039
)
2003
12/31/2003
141 National Business Parkway (O)
Annapolis Junction, MD
11,871

2,398

9,590

2,995

2,398

12,585

14,983

(5,575
)
1990
9/28/1998
14280 Park Meadow Drive (O)
Chantilly, VA

3,731

15,953

1,754

3,731

17,707

21,438

(5,626
)
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

1,488

1,572

9,663

11,235

(3,885
)
2000
7/25/2003
14850 Conference Center Drive (O)
Chantilly, VA

1,615

8,358

2,896

1,615

11,254

12,869

(4,074
)
2000
7/25/2003
14900 Conference Center Drive (O)
Chantilly, VA

3,436

14,402

4,569

3,436

18,971

22,407

(7,396
)
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)
15000 Conference Center Drive (O)
Chantilly, VA
54,000

5,193

47,045

18,692

5,193

65,737

70,930

(25,365
)
1989
11/30/2001
1501 South Clinton Street (O)
Baltimore, MD

27,964

52,146

7,553

27,964

59,699

87,663

(11,059
)
2006
10/27/2009
15010 Conference Center Drive (O)
Chantilly, VA
96,000

3,500

41,921

498

3,500

42,419

45,919

(8,644
)
2006
11/30/2001
15049 Conference Center Drive (O)
Chantilly, VA

4,415

20,365

726

4,415

21,091

25,506

(8,781
)
1997
8/14/2002
15059 Conference Center Drive (O)
Chantilly, VA

5,753

13,615

1,780

5,753

15,395

21,148

(6,071
)
2000
8/14/2002
15395 John Marshall Highway (O)
Haymarket, VA

2,465

24,720


2,465

24,720

27,185

(576
)
2014
5/7/2013
1550 West Nursery Road (O)
Linthicum, MD

14,071

16,930


14,071

16,930

31,001

(3,038
)
2009
10/28/2009
1550 Westbranch Drive (O)
McLean, VA

5,595

26,212

116

5,595

26,328

31,923

(3,647
)
2002
6/28/2010
1560 West Nursery Road (O)
Linthicum, MD

1,441

96


1,441

96

1,537

(2
)
2014
10/28/2009
1560A Cable Ranch Road (O)
San Antonio, TX

1,097

3,770

352

1,097

4,122

5,219

(950
)
1985/2007
6/19/2008
1560B Cable Ranch Road (O)
San Antonio, TX

2,299

6,545

11

2,299

6,556

8,855

(1,532
)
1985/2006
6/19/2008
16442 Commerce Drive (O)
Dahlgren, VA

613

2,582

593

613

3,175

3,788

(1,153
)
2002
12/21/2004
16480 Commerce Drive (O)
Dahlgren, VA

1,856

7,425

167

1,856

7,592

9,448

(2,020
)
2000
12/28/2004
16501 Commerce Drive (O)
Dahlgren, VA

522

2,090

465

522

2,555

3,077

(714
)
2002
12/21/2004
16539 Commerce Drive (O)
Dahlgren, VA

688

2,860

1,469

688

4,329

5,017

(1,696
)
1990
12/21/2004
16541 Commerce Drive (O)
Dahlgren, VA

773

3,094

1,367

773

4,461

5,234

(1,529
)
1996
12/21/2004
16543 Commerce Drive (O)
Dahlgren, VA

436

1,742

172

436

1,914

2,350

(486
)
2002
12/21/2004
1751 Pinnacle Drive (O)
McLean, VA

10,486

42,339

22,325

10,486

64,664

75,150

(20,705
)
1989/1995
9/23/2004
1753 Pinnacle Drive (O)
McLean, VA

8,275

34,353

10,528

8,275

44,881

53,156

(14,406
)
1976/2004
9/23/2004
201 Technology Drive (O)
Lebanon, VA

726

31,091

60

726

31,151

31,877

(5,579
)
2007
10/5/2007
206 Research Boulevard (O)
Aberdeen, MD

1,813

17,485


1,813

17,485

19,298

(979
)
2012
9/14/2007
209 Research Boulevard (O)
Aberdeen, MD

1,045

16,087

32

1,045

16,119

17,164

(1,665
)
2010
9/14/2007
210 Research Boulevard (O)
Aberdeen, MD

1,065

14,687

75

1,065

14,762

15,827

(1,191
)
2010
9/14/2007
21267 Smith Switch Road (O)
Ashburn, VA

4,040

10,369


4,040

10,369

14,409

(106
)
2014
12/27/2012
21271 Smith Switch Road (O)
Ashburn, VA

7,346

16,864


7,346

16,864

24,210

(447
)
2013
12/27/2012
22289 Exploration Drive (O)
Lexington Park, MD

1,422

5,719

1,511

1,422

7,230

8,652

(2,512
)
2000
3/24/2004
22299 Exploration Drive (O)
Lexington Park, MD

1,362

5,791

1,119

1,362

6,910

8,272

(2,433
)
1998
3/24/2004
22300 Exploration Drive (O)
Lexington Park, MD

1,094

5,038

539

1,094

5,577

6,671

(1,878
)
1997
11/9/2004
22309 Exploration Drive (O)
Lexington Park, MD

2,243

10,419

7,491

2,243

17,910

20,153

(3,999
)
1984/1997
3/24/2004
23535 Cottonwood Parkway (O)
California, MD

692

3,051

223

692

3,274

3,966

(1,066
)
1984
3/24/2004
2500 Riva Road (O)
Annapolis, MD

2,791

12,145

1

2,791

12,146

14,937

(4,073
)
2000
3/4/2003
2691 Technology Drive (O)
Annapolis Junction, MD

2,098

17,334

5,115

2,098

22,449

24,547

(6,938
)
2005
5/26/2000
2701 Technology Drive (O)
Annapolis Junction, MD
22,636

1,737

15,266

2,554

1,737

17,820

19,557

(6,641
)
2001
5/26/2000
2711 Technology Drive (O)
Annapolis Junction, MD
17,606

2,251

21,611

1,451

2,251

23,062

25,313

(9,531
)
2002
11/13/2000
2720 Technology Drive (O)
Annapolis Junction, MD

3,863

29,272

113

3,863

29,385

33,248

(7,577
)
2004
1/31/2002
2721 Technology Drive (O)
Annapolis Junction, MD

4,611

14,597

1,226

4,611

15,823

20,434

(5,840
)
2000
10/21/1999
2730 Hercules Road (O)
Annapolis Junction, MD
35,161

8,737

31,612

7,093

8,737

38,705

47,442

(14,268
)
1990
9/28/1998
2900 Towerview Road (O)
Herndon, VA

3,207

16,379

6,419

3,207

22,798

26,005

(5,969
)
1982/2008
12/20/2005
300 Sentinel Drive (O)
Annapolis Junction, MD

1,517

58,827

166

1,517

58,993

60,510

(6,977
)
2009
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)
302 Sentinel Drive (O)
Annapolis Junction, MD

2,648

29,687

423

2,648

30,110

32,758

(5,210
)
2007
11/14/2003
304 Sentinel Drive (O)
Annapolis Junction, MD

3,411

24,917

138

3,411

25,055

28,466

(5,655
)
2005
11/14/2003
306 Sentinel Drive (O)
Annapolis Junction, MD
16,298

3,260

22,592

415

3,260

23,007

26,267

(4,687
)
2006
11/14/2003
308 Sentinel Drive (O)
Annapolis Junction, MD

1,422

26,197


1,422

26,197

27,619

(2,395
)
2010
11/14/2003
310 Sentinel Way (O)
Annapolis Junction, MD

2,372

33,953


2,372

33,953

36,325


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

261

26,531

1,051

261

27,582

27,843

(4,310
)
2009
8/9/2011
312 Sentinel Way (O)
Annapolis Junction, MD

3,138

23,793


3,138

23,793

26,931

(240
)
2014
11/14/2003
3120 Fairview Park Drive (O)
Falls Church, VA

6,863

35,606

7,303

6,863

42,909

49,772

(5,456
)
2008
11/23/2010
314 Sentinel Way (O)
Annapolis Junction, MD

1,254

1,325


1,254

1,325

2,579

(216
)
2008
11/14/2003
316 Sentinel Way (O)
Annapolis Junction, MD

2,748

38,156

139

2,748

38,295

41,043

(2,602
)
2011
11/14/2003
318 Sentinel Way (O)
Annapolis Junction, MD

2,185

28,426


2,185

28,426

30,611

(6,270
)
2005
11/14/2003
320 Sentinel Way (O)
Annapolis Junction, MD

2,067

21,623


2,067

21,623

23,690

(3,770
)
2007
11/14/2003
322 Sentinel Way (O)
Annapolis Junction, MD
21,680

2,605

22,827


2,605

22,827

25,432

(4,572
)
2006
11/14/2003
324 Sentinel Way (O)
Annapolis Junction, MD

1,656

23,018


1,656

23,018

24,674

(2,503
)
2010
6/29/2006
375 West Padonia Road (O)
Timonium, MD

2,483

10,415

4,857

2,483

15,272

17,755

(6,904
)
1986
12/21/1999
410 National Business Parkway (O)
Annapolis Junction, MD

1,831

23,257

112

1,831

23,369

25,200

(1,127
)
2012
6/29/2006
420 National Business Parkway (O)
Annapolis Junction, MD

2,370

27,161

101

2,370

27,262

29,632

(541
)
2013
6/29/2006
430 National Business Parkway (O)
Annapolis Junction, MD

1,852

21,138

120

1,852

21,258

23,110

(1,494
)
2011
6/29/2006
44408 Pecan Court (O)
California, MD

817

1,583

582

817

2,165

2,982

(405
)
1986
3/24/2004
44414 Pecan Court (O)
California, MD

405

1,619

336

405

1,955

2,360

(641
)
1986
3/24/2004
44417 Pecan Court (O)
California, MD

434

3,204

88

434

3,292

3,726

(1,037
)
1989 (7)
3/24/2004
44420 Pecan Court (O)
California, MD

344

890

148

344

1,038

1,382

(199
)
1989
11/9/2004
44425 Pecan Court (O)
California, MD

1,309

3,506

1,307

1,309

4,813

6,122

(1,492
)
1997
5/5/2004
45310 Abell House Lane (O)
California, MD

2,272

13,808


2,272

13,808

16,080

(1,057
)
2011
8/30/2010
46579 Expedition Drive (O)
Lexington Park, MD

1,406

5,796

1,335

1,406

7,131

8,537

(2,780
)
2002
3/24/2004
46591 Expedition Drive (O)
Lexington Park, MD

1,200

7,199

803

1,200

8,002

9,202

(1,618
)
2005
3/24/2004
4851 Stonecroft Boulevard (O)
Chantilly, VA

1,878

11,558

21

1,878

11,579

13,457

(2,959
)
2004
8/14/2002
4940 Campbell Drive (O)
White Marsh, MD

1,379

3,858

1,373

1,379

5,231

6,610

(1,278
)
1990
1/9/2007
525 Babcock Road (O)
Colorado Springs, CO

355

397

79

355

476

831

(153
)
1967
7/12/2007
5325 Nottingham Drive (O)
White Marsh, MD

816

3,976

485

816

4,461

5,277

(1,076
)
2002
1/9/2007
5355 Nottingham Drive (O)
White Marsh, MD

761

3,562

1,758

761

5,320

6,081

(1,874
)
2005
1/9/2007
5520 Research Park Drive (O)
Catonsville, MD


20,072

38


20,110

20,110

(2,687
)
2009
4/4/2006
5522 Research Park Drive (O)
Catonsville, MD


4,550



4,550

4,550

(842
)
2007
3/8/2006
5825 University Research Court (O)
College Park, MD
15,615


22,522

60


22,582

22,582

(3,246
)
2008
1/29/2008
5850 University Research Court (O)
College Park, MD
21,261


31,689

57


31,746

31,746

(3,763
)
2008
1/29/2008
6700 Alexander Bell Drive (O)
Columbia, MD

1,755

7,019

5,550

1,755

12,569

14,324

(5,435
)
1988
5/14/2001
6708 Alexander Bell Drive (O)
Columbia, MD

897

7,544

1,591

897

9,135

10,032

(3,319
)
1988 (7)
5/14/2001
6711 Columbia Gateway Drive (O)
Columbia, MD

2,683

23,239

435

2,683

23,674

26,357

(4,765
)
2006-2007
9/28/2000
6716 Alexander Bell Drive (O)
Columbia, MD

1,242

4,969

3,352

1,242

8,321

9,563

(3,992
)
1990
12/31/1998
 
 
 
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)
6721 Columbia Gateway Drive (O)
Columbia, MD
17,102

1,753

34,090

65

1,753

34,155

35,908

(4,941
)
2009
9/28/2000
6724 Alexander Bell Drive (O)
Columbia, MD

449

5,039

368

449

5,407

5,856

(2,106
)
2001
5/14/2001
6731 Columbia Gateway Drive (O)
Columbia, MD

2,807

19,098

2,046

2,807

21,144

23,951

(7,841
)
2002
3/29/2000
6740 Alexander Bell Drive (O)
Columbia, MD

1,424

5,696

3,346

1,424

9,042

10,466

(4,644
)
1992
12/31/1998
6741 Columbia Gateway Drive (O)
Columbia, MD

675

1,711

114

675

1,825

2,500

(303
)
2008
9/28/2000
6750 Alexander Bell Drive (O)
Columbia, MD

1,263

12,461

3,419

1,263

15,880

17,143

(7,008
)
2001
12/31/1998
6760 Alexander Bell Drive (O)
Columbia, MD

890

3,561

2,763

890

6,324

7,214

(2,989
)
1991
12/31/1998
6940 Columbia Gateway Drive (O)
Columbia, MD

3,545

9,916

4,717

3,545

14,633

18,178

(6,463
)
1999
11/13/1998
6950 Columbia Gateway Drive (O)
Columbia, MD

3,596

14,269

2,164

3,596

16,433

20,029

(6,965
)
1998
10/22/1998
7000 Columbia Gateway Drive (O)
Columbia, MD

3,131

12,103

989

3,131

13,092

16,223

(4,056
)
1999
5/31/2002
7005 Columbia Gateway Drive (O)
Columbia, MD

3,036

14


3,036

14

3,050


(8)
6/26/2014
7015 Albert Einstein Drive (O)
Columbia, MD
1,900

2,058

6,093

855

2,058

6,948

9,006

(2,669
)
1999
12/1/2005
7061 Columbia Gateway Drive (O)
Columbia, MD

729

3,094

1,407

729

4,501

5,230

(1,657
)
2000
8/30/2001
7063 Columbia Gateway Drive (O)
Columbia, MD

902

3,684

1,074

902

4,758

5,660

(2,272
)
2000
8/30/2001
7065 Columbia Gateway Drive (O)
Columbia, MD

919

3,763

2,902

919

6,665

7,584

(2,343
)
2000
8/30/2001
7067 Columbia Gateway Drive (O)
Columbia, MD

1,829

11,823

2,773

1,829

14,596

16,425

(5,461
)
2001
8/30/2001
7125 Columbia Gateway Drive (L)
Columbia, MD

3,361

555

279

3,361

834

4,195


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

17,126

46,994

8,848

17,126

55,842

72,968

(14,434
)
1973/1999
6/29/2006
7130 Columbia Gateway Drive (O)
Columbia, MD

1,350

4,359

1,802

1,350

6,161

7,511

(2,321
)
1989
9/19/2005
7134 Columbia Gateway Drive (O)
Columbia, MD

704

1,971

310

704

2,281

2,985

(638
)
1990
9/19/2005
7138 Columbia Gateway Drive (O)
Columbia, MD

1,104

3,518

1,975

1,104

5,493

6,597

(2,817
)
1990
9/19/2005
7142 Columbia Gateway Drive (O)
Columbia, MD

1,342

3,978

2,494

1,342

6,472

7,814

(2,091
)
1994
9/19/2005
7150 Columbia Gateway Drive (O)
Columbia, MD

1,032

3,429

579

1,032

4,008

5,040

(1,056
)
1991
9/19/2005
7150 Riverwood Drive (O)
Columbia, MD

1,821

4,388

1,332

1,821

5,720

7,541

(1,742
)
2000
1/10/2007
7160 Riverwood Drive (O)
Columbia, MD

2,732

7,006

1,605

2,732

8,611

11,343

(3,040
)
2000
1/10/2007
7170 Riverwood Drive (O)
Columbia, MD

1,283

3,096

658

1,283

3,754

5,037

(1,218
)
2000
1/10/2007
7175 Riverwood Drive (O)
Columbia, MD

1,788

7,270


1,788

7,270

9,058

(207
)
1996/2013
7/27/2005
7200 Redstone Gateway (O)
Huntsville, AL


4,926



4,926

4,926

(133
)
2013
3/23/2010
7200 Riverwood Road (O)
Columbia, MD

4,089

16,356

3,538

4,089

19,894

23,983

(7,933
)
1986
10/13/1998
7205 Riverwood Drive (O)
Columbia, MD

1,367

24,114


1,367

24,114

25,481

(774
)
2013
7/27/2005
7272 Park Circle Drive (O)
Hanover, MD
4,919

1,479

6,300

3,884

1,479

10,184

11,663

(2,461
)
1991/1996
1/10/2007
7318 Parkway Drive (O)
Hanover, MD

972

3,888

926

972

4,814

5,786

(1,879
)
1984
4/16/1999
7320 Parkway Drive (O)
Hanover, MD

905

3,570

4,018

905

7,588

8,493

(2,310
)
1983
4/4/2002
7400 Redstone Gateway (O)
Huntsville, AL


4,163



4,163

4,163


(7)
3/23/2010
7467 Ridge Road (O)
Hanover, MD

1,629

6,517

2,402

1,629

8,919

10,548

(4,138
)
1990
4/28/1999
7740 Milestone Parkway (O)
Hanover, MD
19,357

3,825

34,365

366

3,825

34,731

38,556

(4,003
)
2009
7/2/2007
7770 Backlick Road (O)
Springfield, VA

6,387

74,325

140

6,387

74,465

80,852

(3,414
)
2012
3/10/2010
7880 Milestone Parkway (O)
Hanover, MD

4,857

12,221


4,857

12,221

17,078


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

611

1,611

655

611

2,266

2,877

(396
)
1999
1/9/2007
 
 
 
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)
8007 Corporate Drive (O)
White Marsh, MD

1,434

3,336

1,034

1,434

4,370

5,804

(938
)
1995
1/9/2007
8010 Corporate Drive (O)
White Marsh, MD

1,349

3,262

1,744

1,349

5,006

6,355

(1,282
)
1998
1/9/2007
8013 Corporate Drive (O)
White Marsh, MD

642

1,536

1,809

642

3,345

3,987

(770
)
1990
1/9/2007
8015 Corporate Drive (O)
White Marsh, MD

446

1,116

361

446

1,477

1,923

(428
)
1990
1/9/2007
8019 Corporate Drive (O)
White Marsh, MD

680

1,898

739

680

2,637

3,317

(751
)
1990
1/9/2007
8020 Corporate Drive (O)
White Marsh, MD

2,184

3,767

2,205

2,184

5,972

8,156

(1,499
)
1997
1/9/2007
8023 Corporate Drive (O)
White Marsh, MD

651

1,603

5

651

1,608

2,259

(357
)
1990
1/9/2007
8094 Sandpiper Circle (O)
White Marsh, MD

1,960

3,716

941

1,960

4,657

6,617

(1,125
)
1998
1/9/2007
8098 Sandpiper Circle (O)
White Marsh, MD

1,797

3,651

639

1,797

4,290

6,087

(827
)
1998
1/9/2007
8110 Corporate Drive (O)
White Marsh, MD

2,285

10,117

989

2,285

11,106

13,391

(2,870
)
2001
1/9/2007
8140 Corporate Drive (O)
White Marsh, MD

2,158

8,457

3,008

2,158

11,465

13,623

(3,767
)
2003
1/9/2007
8621 Robert Fulton Drive (O)
Columbia, MD

2,317

12,642

336

2,317

12,978

15,295

(3,015
)
2005-2006
6/10/2005
8661 Robert Fulton Drive (O)
Columbia, MD

1,510

3,764

2,423

1,510

6,187

7,697

(1,848
)
2002
12/30/2003
8671 Robert Fulton Drive (O)
Columbia, MD

1,718

4,280

1,981

1,718

6,261

7,979

(2,754
)
2002
12/30/2003
870 Elkridge Landing Road (O)
Linthicum, MD

2,003

9,442

6,941

2,003

16,383

18,386

(7,965
)
1981
8/3/2001
891 Elkridge Landing Road (O)
Linthicum, MD

1,165

4,772

2,295

1,165

7,067

8,232

(3,229
)
1984
7/2/2001
900 Elkridge Landing Road (O)
Linthicum, MD

1,993

7,972

3,486

1,993

11,458

13,451

(5,655
)
1982
4/30/1998
901 Elkridge Landing Road (O)
Linthicum, MD

1,156

4,437

2,419

1,156

6,856

8,012

(2,672
)
1984
7/2/2001
911 Elkridge Landing Road (O)
Linthicum, MD

1,215

4,861

2,024

1,215

6,885

8,100

(3,239
)
1985
4/30/1998
921 Elkridge Landing Road (O)
Linthicum, MD

1,044

4,239

748

1,044

4,987

6,031

(2,244
)
1983 (7)
4/30/1998
938 Elkridge Landing Road (O)
Linthicum, MD

1,163

4,748

1,155

1,163

5,903

7,066

(1,928
)
1984
7/2/2001
939 Elkridge Landing Road (O)
Linthicum, MD

939

3,756

3,074

939

6,830

7,769

(2,927
)
1983
4/30/1998
940 Elkridge Landing Road (L)
Linthicum, MD

1,104

4,730

170

1,104

4,900

6,004

(4,884
)
(8)
7/2/2001
9651 Hornbaker Road (D)
Manassas, VA

6,050

204,176

853

6,050

205,029

211,079

(10,881
)
2010
9/14/2010
9690 Deereco Road (O)
Timonium, MD

3,415

13,723

7,289

3,415

21,012

24,427

(9,585
)
1988
12/21/1999
9900 Franklin Square Drive (O)
White Marsh, MD

979

3,466

325

979

3,791

4,770

(989
)
1999
1/9/2007
9910 Franklin Square Drive (O)
White Marsh, MD
4,691

1,219

6,590

74

1,219

6,664

7,883

(1,952
)
2005
1/9/2007
9920 Franklin Square Drive (O)
White Marsh, MD

1,058

5,293

1,436

1,058

6,729

7,787

(2,077
)
2006
1/9/2007
Aerotech Commerce (L)
Colorado Springs, CO

900



900


900


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

21,968

109,468

1,209

21,968

110,677

132,645

(22,043
)
1991-1996 (7)
10/14/1997
Arundel Preserve (L)
Hanover, MD

13,401

7,238


13,401

7,238

20,639


(8)
7/2/2007
Ashburn Crossing - DC 10 (O)
Ashburn, VA

4,408

8,399


4,408

8,399

12,807


(7)
12/27/2012
Canton Crossing Land (L)
Baltimore, MD

16,085

905


16,085

905

16,990


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

7,300

15,556

878

7,300

16,434

23,734

(2,755
)
2006
10/27/2009
Columbia Gateway - Southridge (L)
Columbia, MD

6,387

2,940


6,387

2,940

9,327


(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

727


705

727

1,432


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

14,382

9


14,382

9

14,391


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


3,129



3,129

3,129


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

27,785

47,411


27,785

47,411

75,196


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

6,486

10,922


6,486

10,922

17,408


(8)
9/14/2007
Northwest Crossroads (L)
San Antonio, TX

7,430

836


7,430

836

8,266


(8)
1/20/2006
NOVA Office A (O) (9)
Chantilly, VA

2,096

38,142


2,096

38,142

40,238


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

739

18,858


739

18,858

19,597


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

6,587

2


6,587

2

6,589


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

1,637

5,500

2,421

1,637

7,921

9,558

(2,756
)
1974/1985
12/14/2000
Patriot Park (L)
Colorado Springs, CO

8,723

248


8,723

248

8,971


(8)
7/8/2005
Patriot Ridge (L)
Springfield, VA

18,517

14,440


18,517

14,440

32,957


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


14,087



14,087

14,087


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

8,703

541


8,703

541

9,244


(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

(7,646
)
1982/1985
3/30/2005
Sentry Gateway - V (O)
San Antonio, TX


1,066



1,066

1,066

(161
)
2007
3/30/2005
Sentry Gateway - W (O)
San Antonio, TX


1,884



1,884

1,884

(249
)
2009
3/30/2005
Sentry Gateway - X (O)
San Antonio, TX

1,964

21,178


1,964

21,178

23,142

(2,204
)
2010
1/20/2006
Sentry Gateway - Y (O)
San Antonio, TX

1,964

21,298


1,964

21,298

23,262

(2,213
)
2010
1/20/2006
Sentry Gateway - Z (O)
San Antonio, TX

1,964

23,185


1,964

23,185

25,149


(7)
6/14/2005
Westfields - Park Center (L)
Chantilly, VA

16,418

8,584


16,418

8,584

25,002


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

7,141

1,415


7,141

1,415

8,556


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

17,610

6,983


17,610

6,983

24,593


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

9,614

81


9,614

81

9,695


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

8

276

261

8

537

545

(26
)
Various
Various
 
 
$
409,193

$
668,660

$
3,008,508

$
337,168

$
668,660

$
3,345,676

$
4,014,336

$
(703,083
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(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 $83.0 million, term loan facilities of $520.0 million, unsecured senior notes of $890.9 million, exchangeable senior notes of $572,000, unsecured notes payable of $1.6 million, a letter of credit on a mortgage loan of $14.8 million, and net premiums on the remaining loans of $42,000.
(3)
The aggregate cost of these assets for Federal income tax purposes was approximately $3.4 billion at December 31, 2014.
(4)
As discussed in Note 3 to our Consolidated Financial Statements, we recognized impairment losses of $1.4 million primarily in connection with certain of our operating properties in the Greater Baltimore region that were disposed in the current period.
(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, 2014.
(8)
Held or under pre-construction at December 31, 2014.
(9)
The carrying amounts of these properties under construction exclude allocated costs of the garage being constructed to support the properties.
The following table summarizes our changes in cost of properties for the years ended December 31, 2014, 2013 and 2012 (in thousands):
 
 
 
 
 
 
2014
 
2013
 
2012
 
Beginning balance
 
 
$
3,811,950

 
$
3,859,960

 
$
4,038,932

 
Acquisitions of operating properties
 
 

 

 
33,684

 
Improvements and other additions
 
 
254,868

 
249,639

 
214,418

 
Sales
 
 
(48,466
)
 
(141,045
)
 
(291,491
)
 
Impairments
 
 
(3,042
)
 
(45,931
)
 
(121,557
)
 
Other dispositions
 
 
(974
)
 
(110,673
)
 
(13,891
)
 
Other
 
 

 

 
(135
)
 
Ending balance
 
 
$
4,014,336

 
$
3,811,950

 
$
3,859,960

 
 
 
 
 
 
 
 
 
 
 
The following table summarizes our changes in accumulated depreciation for the same time periods (in thousands):
 
 
 
 
 
 
2014
 
2013
 
2012
 
Beginning balance
 
 
$
597,649

 
$
568,176

 
$
577,601

 
Depreciation expense
 
 
111,326

 
92,677

 
93,158

 
Sales
 
 
(3,129
)
 
(9,542
)
 
(40,346
)
 
Impairments
 
 
(1,671
)
 
(14,863
)
 
(58,855
)
 
Other dispositions
 
 
(1,092
)
 
(38,799
)
 
(3,247
)
 
Other
 
 

 

 
(135
)
 
Ending balance
 
 
$
703,083

 
$
597,649

 
$
568,176