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Properties, Net (Tables) | 12 Months Ended
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Dec. 31, 2018
Real Estate [Abstract] |
Schedule of operating properties, net | Operating properties, net consisted of the following (in thousands):
| December 31,
| 2018 |  | 2017
Land | $ | 503,274 |  |  | $ | 455,680 |
Buildings and improvements | 3,241,894 |  |  | 3,068,124 |
Less: Accumulated depreciation | (897,903 | ) |  | (786,193 | )
Operating properties, net | $ | 2,847,265 |  |  | $ | 2,737,611 |
Schedule of projects in development or held for future development | Properties we had in development or held for future development consisted of the following (in thousands):
| December 31,
| 2018 |  | 2017
Land | $ | 207,760 |  |  | $ | 240,825 |
Development in progress, excluding land | 195,601 |  |  | 162,669 |
Projects in development or held for future development | $ | 403,361 |  |  | $ | 403,494 |
Components of assets held for sale | The table below sets forth the components of this property’s assets as of December 31, 2017 (in thousands):
Properties, net |  | $ | 38,670 |
Deferred rent receivable |  | 3,237 |
Deferred leasing costs, net |  | 319 |
Assets held for sale, net |  | $ | 42,226 |
Schedule of operating property dispositions | In 2017, we sold the following operating properties (dollars in thousands):
Project Name |  | City, State |  | Segment |  | Date of Sale |  | Number of Buildings |  | Total Rentable Square Feet |  | Transaction Value |  | Gain on Sale
3120 Fairview Park Drive |  | Falls Church, VA |  | Northern Virginia Defense/IT |  | 2/15/2017 |  | 1 |  |  | 190,000 |  |  | $ | 39,000 |  |  | $ | — |
1334 Ashton Road |  | Hanover, MD |  | Fort Meade/BW Corridor |  | 6/9/2017 |  | 1 |  |  | 37,000 |  |  | 2,300 |  |  | — |
Remaining White Marsh Properties (1) |  | White Marsh, MD |  | Regional Office and Other |  | 7/28/2017 |  | 8 |  |  | 412,000 |  |  | 47,500 |  |  | 1,180 |
201 Technology Drive |  | Lebanon, VA |  | Data Center Shells |  | 10/27/2017 |  | 1 |  |  | 103,000 |  |  | 29,500 |  |  | 3,625 |
7320 Parkway Drive |  | Hanover, MD |  | Fort Meade/BW Corridor |  | 12/15/2017 |  | 1 |  |  | 57,000 |  |  | 7,529 |  |  | 831 |
|  |  |  | 12 |  |  | 799,000 |  |  | $ | 125,829 |  |  | $ | 5,636 |
(1) This sale also included land In 2016, we sold the following operating properties (dollars in thousands):
Project Name |  | City, State |  | Segment |  | Date of Sale |  | Number of Buildings |  | Total Rentable Square Feet |  | Transaction Value |  | Gain on Sale
Arborcrest Corporate Campus (1) |  | Philadelphia, PA |  | Regional Office |  | 8/4/2016 |  | 4 |  |  | 654,000 |  |  | $ | 142,800 |  |  | $ | 4,742 |
8003 Corporate Drive |  | White Marsh, MD |  | Regional Office |  | 8/17/2016 |  | 1 |  |  | 18,000 |  |  | 2,400 |  |  | — |
1341 & 1343 Ashton Road |  | Hanover, MD |  | Fort Meade/BW Corridor |  | 9/9/2016 |  | 2 |  |  | 25,000 |  |  | 2,900 |  |  | 848 |
8007, 8013, 8015, 8019 and 8023-8027 Corporate Drive (1) |  | White Marsh, MD |  | Regional Office |  | 9/21/2016 |  | 5 |  |  | 130,000 |  |  | 14,513 |  |  | 1,906 |
1302, 1304 and 1306 Concourse Drive |  | Linthicum, MD |  | Fort Meade/BW Corridor |  | 9/29/2016 |  | 3 |  |  | 299,000 |  |  | 48,100 |  |  | 8,375 |
2900 Towerview Road |  | Herndon, VA |  | Northern Virginia Defense/IT |  | 10/19/2016 |  | 1 |  |  | 151,000 |  |  | 12,100 |  |  | — |
4940 Campbell Boulevard |  | White Marsh, MD |  | Regional Office |  | 11/17/2016 |  | 1 |  |  | 50,000 |  |  | 5,200 |  |  | — |
1560 A and B Cable Ranch Road |  | San Antonio, TX |  | Other |  | 11/30/2016 |  | 2 |  |  | 120,000 |  |  | 10,300 |  |  | — |
1331 Ashton Road |  | Hanover, MD |  | Fort Meade/BW Corridor |  | 12/19/2016 |  | 1 |  |  | 29,000 |  |  | 2,625 |  |  | — |
900 Elkridge Landing Road |  | Linthicum, MD |  | Fort Meade/BW Corridor |  | 12/22/2016 |  | 1 |  |  | 101,000 |  |  | 7,800 |  |  | — |
|  |  |  |  |  |  |  | 21 |  |  | 1,577,000 |  |  | $ | 248,738 |  |  | $ | 15,871 |
(1) This sale also included land.

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- Definition Tabular disclosure of long lived assets held for sale. Disclosure may include the description of the facts and circumstances leading to the expected disposal, manner and timing of disposal, the carrying value of the assets held for sale, the gain (loss) recognized in the income statement and the income statement caption that includes that gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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