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ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP | 9 Months Ended
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Sep. 30, 2022
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 Brandywine Realty Trust (the "Parent Company") is a self-administered and self-managed real estate investment trust (“REIT”) engaged in the acquisition, development, redevelopment, ownership, management, and operation of a portfolio of office and mixed-use properties. The Parent Company owns its assets and conducts its operations through Brandywine Operating Partnership, L.P. (the "Operating Partnership") and subsidiaries of the Operating Partnership. The Parent Company is the sole general partner of the Operating Partnership and, as of September 30, 2022, owned a 99.7% 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.” The Parent Company, the Operating Partnership, and their consolidated subsidiaries are collectively referred to as the "Company." As of September 30, 2022, the Company owned 78 properties that contained an aggregate of approximately 13.7 million net rentable square feet (collectively, the “Properties”). The Company’s core portfolio of operating properties (the “Core Properties”) excludes development properties, redevelopment properties, and properties held for sale. The Properties were comprised of the following as of September 30, 2022:
| Number of Properties |  | Rentable Square Feet
Office properties | 67 |  |  | 11,848,707 |
Mixed-use properties | 5 |  |  | 942,334 |
Core Properties | 72 |  |  | 12,791,041 |
Development property | 1 |  |  | 144,685 |
Redevelopment properties | 3 |  |  | 436,659 |
Recently completed - not stabilized property | 1 |  |  | 205,803 |
Held for sale properties | 1 |  |  | 86,021 |
The Properties | 78 |  |  | 13,664,209 |
In addition to the Properties, as of September 30, 2022, the Company owned 159.9 acres of land held for development. The Company also held a leasehold interest in one land parcel totaling 0.8 acres, acquired through a prepaid 99-year ground lease, and held options to purchase approximately 55.1 additional acres of undeveloped land. As of September 30, 2022, the total potential development that this inventory of land could support under current zoning and entitlements, including the parcels under option, amounted to an estimated 12.8 million square feet. As of September 30, 2022, the Company also owned economic interests in thirteen unconsolidated real estate ventures (see Note 4, ''Investment in Unconsolidated Real Estate Ventures,” for further information). The Properties and the properties owned by the unconsolidated real estate ventures are primarily located in or near Philadelphia, Pennsylvania; Austin, Texas; Metropolitan Washington, D.C.; Southern New Jersey; and Wilmington, Delaware. The Company conducts its third-party real estate management services business primarily through wholly-owned management company subsidiaries. As of September 30, 2022, the management company subsidiaries were managing properties containing an aggregate of approximately 23.1 million net rentable square feet, of which approximately 13.7 million net rentable square feet related to Properties owned by the Company and approximately 9.4 million net rentable square feet related to properties owned by third parties and unconsolidated real estate ventures. Unless otherwise indicated, all references in this Form 10-Q to square feet represent net rentable area.

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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 https://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 https://asc.fasb.org/topic&trid=2134479 + Details
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