Information by Business Segment (Details) - USD ($)
$ in Thousands |
3 Months Ended |
12 Months Ended |
Dec. 31, 2019 |
Sep. 30, 2019 |
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from real estate operations |
$ 157,785
|
$ 159,431
|
$ 175,070
|
$ 148,940
|
$ 138,482
|
$ 137,411
|
$ 146,743
|
$ 155,476
|
$ 641,226
|
$ 578,112
|
$ 612,820
|
| Property operating expenses |
|
|
|
|
|
|
|
|
198,143
|
201,035
|
190,964
|
| UJV NOI allocable to COPT |
|
|
|
|
|
|
|
|
5,705
|
4,818
|
4,805
|
| Segment assets |
3,854,453
|
|
|
|
3,656,005
|
|
|
|
3,854,453
|
3,656,005
|
|
| Segment assets |
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|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
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|
|
|
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|
|
|
|
|
| Segment assets |
3,024,958
|
|
|
|
3,084,862
|
|
|
|
3,024,958
|
3,084,862
|
|
| Real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from real estate operations |
|
|
|
|
|
|
|
|
527,463
|
517,253
|
509,980
|
| Property operating expenses |
|
|
|
|
|
|
|
|
198,143
|
201,035
|
190,964
|
| UJV NOI allocable to COPT |
|
|
|
|
|
|
|
|
5,705
|
4,818
|
4,805
|
| NOI from real estate operations |
|
|
|
|
|
|
|
|
335,025
|
321,036
|
323,821
|
| Additions to long-lived assets |
|
|
|
|
|
|
|
|
76,350
|
74,742
|
73,341
|
| Transfers from non-operating properties |
|
|
|
|
|
|
|
|
226,001
|
166,143
|
202,211
|
| Real estate operations | Defense/Information Technology Locations |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from real estate operations |
|
|
|
|
|
|
|
|
435,486
|
421,053
|
408,122
|
| Property operating expenses |
|
|
|
|
|
|
|
|
153,803
|
153,004
|
146,558
|
| UJV NOI allocable to COPT |
|
|
|
|
|
|
|
|
5,705
|
4,818
|
4,805
|
| NOI from real estate operations |
|
|
|
|
|
|
|
|
287,388
|
272,867
|
266,369
|
| Additions to long-lived assets |
|
|
|
|
|
|
|
|
54,404
|
53,676
|
44,352
|
| Transfers from non-operating properties |
|
|
|
|
|
|
|
|
227,013
|
163,839
|
202,185
|
| Real estate operations | Defense/Information Technology Locations | Fort Meade/BW Corridor |
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|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
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|
|
|
|
|
|
|
|
|
|
| Revenues from real estate operations |
|
|
|
|
|
|
|
|
252,781
|
248,927
|
245,613
|
| Property operating expenses |
|
|
|
|
|
|
|
|
82,815
|
82,975
|
80,697
|
| NOI from real estate operations |
|
|
|
|
|
|
|
|
169,966
|
165,952
|
164,916
|
| Additions to long-lived assets |
|
|
|
|
|
|
|
|
34,618
|
38,612
|
26,659
|
| Transfers from non-operating properties |
|
|
|
|
|
|
|
|
18,606
|
35,648
|
43,370
|
| Real estate operations | Defense/Information Technology Locations | Northern Virginia Defense/IT |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from real estate operations |
|
|
|
|
|
|
|
|
55,742
|
53,518
|
47,118
|
| Property operating expenses |
|
|
|
|
|
|
|
|
19,779
|
20,330
|
16,938
|
| NOI from real estate operations |
|
|
|
|
|
|
|
|
35,963
|
33,188
|
30,180
|
| Additions to long-lived assets |
|
|
|
|
|
|
|
|
9,326
|
7,956
|
8,115
|
| Transfers from non-operating properties |
|
|
|
|
|
|
|
|
4,548
|
10,231
|
48,328
|
| Real estate operations | Defense/Information Technology Locations | Lackland Air Force Base |
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|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from real estate operations |
|
|
|
|
|
|
|
|
51,140
|
46,286
|
47,209
|
| Property operating expenses |
|
|
|
|
|
|
|
|
29,042
|
26,888
|
27,812
|
| NOI from real estate operations |
|
|
|
|
|
|
|
|
22,098
|
19,398
|
19,397
|
| Additions to long-lived assets |
|
|
|
|
|
|
|
|
0
|
0
|
71
|
| Transfers from non-operating properties |
|
|
|
|
|
|
|
|
10,781
|
14,718
|
0
|
| Real estate operations | Defense/Information Technology Locations | Navy Support Locations |
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|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from real estate operations |
|
|
|
|
|
|
|
|
32,659
|
31,927
|
29,540
|
| Property operating expenses |
|
|
|
|
|
|
|
|
13,579
|
13,536
|
12,619
|
| NOI from real estate operations |
|
|
|
|
|
|
|
|
19,080
|
18,391
|
16,921
|
| Additions to long-lived assets |
|
|
|
|
|
|
|
|
8,912
|
6,535
|
8,451
|
| Transfers from non-operating properties |
|
|
|
|
|
|
|
|
0
|
(116)
|
474
|
| Real estate operations | Defense/Information Technology Locations | Redstone Arsenal |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from real estate operations |
|
|
|
|
|
|
|
|
16,593
|
14,745
|
14,322
|
| Property operating expenses |
|
|
|
|
|
|
|
|
6,626
|
6,050
|
5,783
|
| NOI from real estate operations |
|
|
|
|
|
|
|
|
9,967
|
8,695
|
8,539
|
| Additions to long-lived assets |
|
|
|
|
|
|
|
|
1,548
|
573
|
1,056
|
| Transfers from non-operating properties |
|
|
|
|
|
|
|
|
33,606
|
4,167
|
2,159
|
| Real estate operations | Defense/Information Technology Locations | Data Center Shells |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from real estate operations |
|
|
|
|
|
|
|
|
26,571
|
25,650
|
24,320
|
| Property operating expenses |
|
|
|
|
|
|
|
|
1,962
|
3,225
|
2,709
|
| UJV NOI allocable to COPT |
|
|
|
|
|
|
|
|
5,705
|
4,818
|
4,805
|
| NOI from real estate operations |
|
|
|
|
|
|
|
|
30,314
|
27,243
|
26,416
|
| Additions to long-lived assets |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Transfers from non-operating properties |
|
|
|
|
|
|
|
|
159,472
|
99,191
|
107,854
|
| Real estate operations | Regional Office |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from real estate operations |
|
|
|
|
|
|
|
|
59,611
|
61,181
|
68,262
|
| Property operating expenses |
|
|
|
|
|
|
|
|
29,682
|
30,253
|
28,982
|
| NOI from real estate operations |
|
|
|
|
|
|
|
|
29,929
|
30,928
|
39,280
|
| Additions to long-lived assets |
|
|
|
|
|
|
|
|
20,925
|
19,730
|
25,299
|
| Transfers from non-operating properties |
|
|
|
|
|
|
|
|
0
|
0
|
0
|
| Real estate operations | Operating Wholesale Data Center |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from real estate operations |
|
|
|
|
|
|
|
|
29,405
|
31,892
|
28,875
|
| Property operating expenses |
|
|
|
|
|
|
|
|
13,213
|
16,342
|
13,551
|
| NOI from real estate operations |
|
|
|
|
|
|
|
|
16,192
|
15,550
|
15,324
|
| Additions to long-lived assets |
|
|
|
|
|
|
|
|
893
|
856
|
3,580
|
| Transfers from non-operating properties |
|
|
|
|
|
|
|
|
(1,012)
|
2,304
|
8
|
| Real estate operations | Other |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Revenues from real estate operations |
|
|
|
|
|
|
|
|
2,961
|
3,127
|
4,721
|
| Property operating expenses |
|
|
|
|
|
|
|
|
1,445
|
1,436
|
1,873
|
| NOI from real estate operations |
|
|
|
|
|
|
|
|
1,516
|
1,691
|
2,848
|
| Additions to long-lived assets |
|
|
|
|
|
|
|
|
128
|
480
|
110
|
| Transfers from non-operating properties |
|
|
|
|
|
|
|
|
0
|
0
|
18
|
| Real estate operations | Segment assets |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Segment assets |
3,024,958
|
|
|
|
3,084,862
|
|
|
|
3,024,958
|
3,084,862
|
3,028,005
|
| Real estate operations | Segment assets | Defense/Information Technology Locations |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Segment assets |
2,426,019
|
|
|
|
2,468,727
|
|
|
|
2,426,019
|
2,468,727
|
2,398,989
|
| Real estate operations | Segment assets | Defense/Information Technology Locations | Fort Meade/BW Corridor |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Segment assets |
1,280,656
|
|
|
|
1,279,571
|
|
|
|
1,280,656
|
1,279,571
|
1,263,567
|
| Real estate operations | Segment assets | Defense/Information Technology Locations | Northern Virginia Defense/IT |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Segment assets |
396,914
|
|
|
|
399,339
|
|
|
|
396,914
|
399,339
|
402,076
|
| Real estate operations | Segment assets | Defense/Information Technology Locations | Lackland Air Force Base |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Segment assets |
146,592
|
|
|
|
139,731
|
|
|
|
146,592
|
139,731
|
128,755
|
| Real estate operations | Segment assets | Defense/Information Technology Locations | Navy Support Locations |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Segment assets |
184,257
|
|
|
|
188,911
|
|
|
|
184,257
|
188,911
|
194,476
|
| Real estate operations | Segment assets | Defense/Information Technology Locations | Redstone Arsenal |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Segment assets |
138,501
|
|
|
|
108,010
|
|
|
|
138,501
|
108,010
|
108,119
|
| Real estate operations | Segment assets | Defense/Information Technology Locations | Data Center Shells |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Segment assets |
279,099
|
|
|
|
353,165
|
|
|
|
279,099
|
353,165
|
301,996
|
| Real estate operations | Segment assets | Regional Office |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Segment assets |
392,319
|
|
|
|
395,380
|
|
|
|
392,319
|
395,380
|
400,512
|
| Real estate operations | Segment assets | Operating Wholesale Data Center |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Segment assets |
202,935
|
|
|
|
216,640
|
|
|
|
202,935
|
216,640
|
224,422
|
| Real estate operations | Segment assets | Other |
|
|
|
|
|
|
|
|
|
|
|
| Segment financial information for real estate operations |
|
|
|
|
|
|
|
|
|
|
|
| Segment assets |
$ 3,685
|
|
|
|
$ 4,115
|
|
|
|
$ 3,685
|
$ 4,115
|
$ 4,082
|