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Real Estate Investments (Tables) | 9 Months Ended
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Sep. 30, 2021
Real Estate [Abstract] |
Gross Carrying Value of Operating Properties | As of September 30, 2021 and December 31, 2020, the gross carrying value of the operating properties was as follows (in thousands):
| September 30, 2021 |  | December 31, 2020
Land | $ | 391,261 |  |  | $ | 407,514 |
Building and improvements | 2,640,229 |  |  | 2,665,232 |
Tenant improvements | 405,584 |  |  | 401,363 |
Total | $ | 3,437,074 |  |  | $ | 3,474,109 |
Summary of Properties Sold | The following table summarizes the property dispositions during the nine months ended September 30, 2021 (dollars in thousands):
Property/Portfolio Name |  | Disposition Date |  | Location |  | Property Type |  | Rentable Square Feet/Acres |  | Sales Price |  | Gain/(Loss) on Sale (a)
2100-2200 Lenox Drive |  | July 6, 2021 |  | Lawrenceville, NJ |  | Land |  | 35.2 acres |  | $ | 8,900 |  |  | $ | 842 |
1100 Lenox Drive |  | September 8, 2021 |  | Lawrenceville, NJ |  | Land |  | 5.0 acres |  | $ | 2,575 |  |  | $ | 68 |
(a)Gain/(Loss) on Sale is net of closing and other transaction related costs.

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