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SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2013 | Jan. 31, 2012 | Apr. 30, 2012 | Apr. 30, 2011
Segment revenues and net operating income [Abstract] |  |  |  |  |  |
Real estate revenue | $ 66,231 | $ 60,546 | $ 193,160 | $ 179,910 |  |
Real estate expenses | 26,375 | 24,590 | 76,020 | 74,759 |  |
Gain on Business Interruption Insurance Recovery | 0 | 0 | 2,263 | 0 |  |
Net operating income | 39,856 | 35,956 | 119,403 | 105,151 |  |
Depreciation/amortization | (16,300) | (15,183) | (49,028) | (44,865) |  |
Administrative, advisory and trustee services | (2,245) | (1,659) | (6,402) | (5,944) |  |
Other expenses | (464) | (359) | (1,496) | (1,509) |  |
Interest expense | (15,725) | (16,411) | (48,448) | (48,389) |  |
Interest and other income | 255 | 279 | 600 | 645 |  |
Income from continuing operations | 5,377 | 2,623 | 14,629 | 5,089 |  |
Income from discontinued operations | 776 | (102) | 3,530 | 496 |  |
Net income | 6,153 | 2,521 | 18,159 | 5,585 |  |
Segment Assets [Abstract] |  |  |  |  |  |
Property owned | 2,007,832 |  | 2,007,832 |  | 1,892,009 |
Less accumulated depreciation | (408,400) |  | (408,400) |  | (373,490) |
Total property owned | 1,599,432 |  | 1,599,432 |  | 1,518,519 |
Real Estate Held-for-sale | 733 |  | 733 |  | 2,067 |
Cash and cash equivalents | 62,302 | 35,502 | 62,302 | 35,502 | 39,989 | 41,191
Other investments | 638 |  | 638 |  | 634 |
Receivables and other assets | 113,963 |  | 113,963 |  | 114,569 |
Development in progress | 20,127 |  | 20,127 |  | 27,599 |
Unimproved land | 18,879 |  | 18,879 |  | 10,990 |
Total Assets | 1,816,074 |  | 1,816,074 |  | 1,714,367 |
Multi-Family Residential [Member] |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |
Real estate revenue | 23,067 | 18,400 | 67,381 | 53,441 |  |
Real estate expenses | 10,344 | 8,452 | 28,646 | 25,124 |  |
Gain on Business Interruption Insurance Recovery |  |  | 2,263 |  |  |
Net operating income | 12,723 | 9,948 | 40,998 | 28,317 |  |
Segment Assets [Abstract] |  |  |  |  |  |
Property owned | 626,763 |  | 626,763 |  | 539,783 |
Less accumulated depreciation | (135,673) |  | (135,673) |  | (128,834) |
Total property owned | 491,090 |  | 491,090 |  | 410,949 |
Commercial-Office [Member] |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |
Real estate revenue | 19,338 | 18,541 | 57,105 | 55,723 |  |
Real estate expenses | 9,399 | 8,694 | 28,081 | 26,451 |  |
Gain on Business Interruption Insurance Recovery |  |  | 0 |  |  |
Net operating income | 9,939 | 9,847 | 29,024 | 29,272 |  |
Segment Assets [Abstract] |  |  |  |  |  |
Property owned | 611,174 |  | 611,174 |  | 605,318 |
Less accumulated depreciation | (133,861) |  | (133,861) |  | (121,422) |
Total property owned | 477,313 |  | 477,313 |  | 483,896 |
Commercial-Medical [Member] |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |
Real estate revenue | 16,207 | 16,610 | 47,051 | 50,299 |  |
Real estate expenses | 4,129 | 5,220 | 12,395 | 16,709 |  |
Gain on Business Interruption Insurance Recovery |  |  | 0 |  |  |
Net operating income | 12,078 | 11,390 | 34,656 | 33,590 |  |
Segment Assets [Abstract] |  |  |  |  |  |
Property owned | 513,565 |  | 513,565 |  | 500,268 |
Less accumulated depreciation | (89,542) |  | (89,542) |  | (78,744) |
Total property owned | 424,023 |  | 424,023 |  | 421,524 |
Commercial-Industrial [Member] |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |
Real estate revenue | 3,853 | 3,596 | 10,890 | 10,597 |  |
Real estate expenses | 1,095 | 1,078 | 3,050 | 3,178 |  |
Gain on Business Interruption Insurance Recovery |  |  | 0 |  |  |
Net operating income | 2,758 | 2,518 | 7,840 | 7,419 |  |
Segment Assets [Abstract] |  |  |  |  |  |
Property owned | 125,431 |  | 125,431 |  | 119,002 |
Less accumulated depreciation | (22,890) |  | (22,890) |  | (20,693) |
Total property owned | 102,541 |  | 102,541 |  | 98,309 |
Commercial-Retail [Member] |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |
Real estate revenue | 3,766 | 3,399 | 10,733 | 9,850 |  |
Real estate expenses | 1,408 | 1,146 | 3,848 | 3,297 |  |
Gain on Business Interruption Insurance Recovery |  |  | 0 |  |  |
Net operating income | 2,358 | 2,253 | 6,885 | 6,553 |  |
Segment Assets [Abstract] |  |  |  |  |  |
Property owned | 130,899 |  | 130,899 |  | 127,638 |
Less accumulated depreciation | (26,434) |  | (26,434) |  | (23,797) |
Total property owned | $ 104,465 |  | $ 104,465 |  | $ 103,841 |

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