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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) | Jul. 31, 2014 | Apr. 30, 2014
--- | --- | ---
Other assets |  |
Receivable arising from straight-lining of rents, allowance | $ 717,000 | $ 796,000
Accounts receivable, allowance | 306,000 | 248,000
Intangible assets, accumulated amortization | 25,497,000 | 24,071,000
Property and equipment, accumulated depreciation | 2,140,000 | 2,041,000
Deferred charges and leasing costs, accumulated amortization | 22,237,000 | 21,068,000
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) | 114,762,774 | 109,019,341
Common Shares of Beneficial Interest, shares outstanding (in shares) | 114,762,774 | 109,019,341
Noncontrolling interests - Operating Partnership (in shares) | 17,975,440 | 21,093,445
Preferred Series 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 Series 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 | 4,600,000
Preferred Shares of Beneficial Interest, shares outstanding (in shares) | 4,600,000 | 4,600,000
Preferred Shares of Beneficial Interest, aggregate liquidation preference | $ 115,000,000 | $ 115,000,000

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