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Consolidated Balance Sheets (Parenthetical) (USD $) | Sep. 30, 2011 | Dec. 31, 2010
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Brandywine Realty Trust's equity: |  |
Preferred shares, shares authorized | 20,000,000 | 20,000,000
Common shares of Brandywine Realty Trust's beneficial interest, par value | $ 0.01 | $ 0.01
Common shares of Brandywine Realty Trust's beneficial interest, shares authorized | 200,000,000 | 200,000,000
Common shares of Brandywine Realty Trust's beneficial interest, shares issued | 135,579,643 | 134,601,796
Common shares of Brandywine Realty Trust's beneficial interest, shares outstanding | 135,579,643 | 134,485,117
Common shares in treasury, at cost, shares | 0 | 116,679
Common shares in grantor trust, shares | 292,646 | 291,281
BRANDYWINE OPERATING PARTNERSHIP, L.P. | 7.50% Series D Preferred Shares |  |
Brandywine Realty Trust's equity: |  |
Preferred shares, shares issued | 2,000,000 | 2,000,000
Preferred shares, shares outstanding | 2,000,000 | 2,000,000
7.50% Series C Preferred Shares |  |
Brandywine Realty Trust's equity: |  |
Preferred shares, par value | $ 0.01 | $ 0.01
Preferred shares, shares issued | 2,000,000 | 2,000,000
Preferred shares, shares outstanding | 2,000,000 | 2,000,000
7.375% Series D Preferred Shares |  |
Brandywine Realty Trust's equity: |  |
Preferred shares, par value | $ 0.01 | $ 0.01
Preferred shares, shares issued | 2,300,000 | 2,300,000
Preferred shares, shares outstanding | 2,300,000 | 2,300,000
BRANDYWINE OPERATING PARTNERSHIP, L.P. | 7.375% Series E Preferred Shares |  |
Brandywine Realty Trust's equity: |  |
Preferred shares, shares issued | 2,300,000 | 2,300,000
Preferred shares, shares outstanding | 2,300,000 | 2,300,000
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |
Brandywine Realty Trust's equity: |  |
General Partners' Capital account, units issued | 135,579,643 | 134,601,796
General Partners' Capital account, units outstanding | 135,579,643 | 134,485,117
Redeemable limited partnership, units issued | 9,809,759 | 9,902,752
Redeemable limited partnership, units outstanding | 9,809,759 | 9,902,752

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