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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) | Apr. 30, 2013 | Apr. 30, 2012
--- | --- | ---
Other assets |  |
Receivable arising from straight-lining of rents, allowance | $ 830 | $ 1,209
Accounts receivable, allowance | 563 | 154
Intangible assets, accumulated amortization | 27,708 | 47,813
Property and equipment, accumulated depreciation | 1,673 | 1,423
Deferred charges and leasing costs, accumulated amortization | 18,714 | 16,244
Statement [Line Items] |  |
Common Shares of Beneficial Interest, no par value (in dollars per share) | $ 0 | $ 0
Common Shares of Beneficial Interest, shares issued (in shares) | 101,487,976 | 89,473,838
Common Shares of Beneficial Interest, shares outstanding (in shares) | 101,487,976 | 89,473,838
Noncontrolling interests - Operating Partnership (in shares) | 21,635,127 | 20,332,415
Preferred Class A [Member] |  |
Statement [Line Items] |  |
Preferred Shares of Beneficial Interest, no par value (in dollars per share) | $ 0 | $ 0
Preferred Shares of Beneficial Interest, shares issued (in shares) | 1,150,000 | 1,150,000
Preferred Shares of Beneficial Interest, shares outstanding (in shares) | 1,150,000 | 1,150,000
Preferred Shares of Beneficial Interest, aggregate liquidation preference | 28,750,000 | 28,750,000
Preferred Class B [Member] |  |
Statement [Line Items] |  |
Preferred Shares of Beneficial Interest, no par value (in dollars per share) | $ 0 | $ 0
Preferred Shares of Beneficial Interest, shares issued (in shares) | 4,600,000 | 0
Preferred Shares of Beneficial Interest, shares outstanding (in shares) | 4,600,000 | 0
Preferred Shares of Beneficial Interest, aggregate liquidation preference | $ 115,000,000 | $ 115,000,000

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