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Organization of the Parent Company and The Operating Partnership (Tables) | 9 Months Ended
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Sep. 30, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Summary of Core Portfolio of Operating Properties and Excludes Development and Redevelopment Properties Under Construction | The Company’s core portfolio of operating properties, as of September 30, 2018, excludes two development properties and five redevelopment properties under construction or committed for construction (collectively, the “Core Properties”). The Properties were comprised of the following as of September 30, 2018:
|  |  | Number of Properties |  |  | Rentable Square Feet |
Office properties |  |  |  | 73 |  |  |  | 13,673,405 |
Mixed-use properties |  |  |  | 4 |  |  |  | 646,741 |
Retail properties |  |  |  | 1 |  |  |  | 17,884 |
Core Properties |  |  |  | 78 |  |  |  | 14,338,030 |
Development properties |  |  |  | 2 |  |  |  | 247,818 |
Redevelopment properties |  |  |  | 5 |  |  |  | 583,719 |
Held for sale properties (a) |  |  |  | 8 |  |  |  | 1,293,197 |
The Properties |  |  |  | 93 |  |  |  | 16,462,764 |
(a) As of September 30, 2018, eight office properties were classified as held for sale in the Company’s Metropolitan Washington, D.C. segment. See Note 3, “Real Estate Investments,” for further information.

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