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Organization of the Parent Company and The Operating Partnership | 12 Months Ended
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Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP | 1. ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP The Parent Company is a self-administered and self-managed real estate investment trust (“REIT”) that provides leasing, property management, development, redevelopment, acquisition and other tenant-related services for a portfolio of office, retail and mixed-use properties. The Parent Company owns its assets and conducts its operations through the Operating Partnership and subsidiaries of the Operating Partnership. The Parent Company is the sole general partner of the Operating Partnership and, as of December 31, 2018, owned a 99.4% interest in the Operating Partnership. The Parent Company’s common shares of beneficial interest are publicly traded on the New York Stock Exchange under the ticker symbol “BDN.” As of December 31, 2018, the Company owned 97 properties that contained an aggregate of approximately 16.8 million net rentable square feet (collectively, the “Properties”). The Company’s core portfolio of operating properties, as of December 31, 2018, excludes one development property and three redevelopment properties under construction or committed for construction (collectively, the “Core Properties”). The Properties were comprised of the following as of December 31, 2018:
|  |  | Number of Properties |  |  | Rentable Square Feet |
Office properties |  |  |  | 88 |  |  |  | 15,609,156 |
Mixed-use properties |  |  |  | 4 |  |  |  | 646,741 |
Retail property |  |  |  | 1 |  |  |  | 17,884 |
Core Properties |  |  |  | 93 |  |  |  | 16,273,781 |
Development property |  |  |  | 1 |  |  |  | 164,818 |
Redevelopment properties |  |  |  | 3 |  |  |  | 338,650 |
The Properties |  |  |  | 97 |  |  |  | 16,777,249 |
In addition to the Properties, as of December 31, 2018, the Company owned land held for development, comprised of 237.4 acres of undeveloped land, of which 37.9 acres were held for sale, 1.8 acres related to leasehold interests in two land parcels, each acquired through prepaid 99-year ground leases, and held options to purchase approximately 55.5 additional acres of undeveloped land. As of December 31, 2018, the total potential development that these land parcels could support, under current zoning and entitlements, including the parcels under option, amounted to an estimated 14.3 million square feet, of which 0.4 million square feet relates to the 37.9 acres held for sale. As of December 31, 2018, the Company also owned economic interests in ten unconsolidated real estate ventures (collectively, the “Real Estate Ventures”) (see Note 4, “Investment in Unconsolidated Real Estate Ventures,” for further information). The Properties and the properties owned by the Real Estate Ventures are located in or near Philadelphia, Pennsylvania; Austin, Texas; Metropolitan Washington, D.C.; Southern New Jersey; and Wilmington, Delaware. All references to building square footage, rentable square feet, acres, occupancy percentage the number of buildings and tax basis are unaudited. The Company conducts its third-party real estate management services business primarily through six management companies (collectively, the “Management Companies”): Brandywine Realty Services Corporation (“BRSCO”), BDN Management Holdings, LLC (“BMH”), Brandywine Properties I Limited, Inc. (“BPI”), BDN Brokerage, LLC (“BBL”), Brandywine Properties Management, L.P. (“BPM”) and Brandywine Brokerage Services, LLC (“BBS”). BRSCO, BMH and BPI are each a taxable REIT subsidiary. As of December 31, 2018, the Operating Partnership owned, directly and indirectly, 100% of each of BRSCO, BMH, BPI, BBL, BPM and BBS. As of December 31, 2018, the Management Company subsidiaries were managing properties containing an aggregate of approximately 24.8 million net rentable square feet, of which approximately 16.8 million net rentable square feet related to Properties owned by the Company and approximately 8.0 million net rentable square feet related to properties owned by third parties and Real Estate Ventures.

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- Definition The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
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