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SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2013 | Oct. 31, 2012 | Oct. 31, 2013 | Oct. 31, 2012 | Apr. 30, 2013 | Apr. 30, 2012
Segment revenues and net operating income [Abstract] |  |  |  |  |  |
Real estate revenue | $ 66,190 | $ 62,258 | $ 131,697 | $ 121,603 |  |
Real estate expenses | 26,515 | 24,049 | 53,339 | 48,114 |  |
Gain on involuntary conversion | 0 | 2,263 | 966 | 2,263 |  |
Net operating income | 39,675 | 40,472 | 79,324 | 75,752 |  |
Depreciation/amortization | (17,257) | (15,758) | (36,352) | (31,201) |  |
Administrative, advisory and trustee services | (2,527) | (2,061) | (5,280) | (4,157) |  |
Impairment of real estate investments |  |  | (265) |  |  |
Other expenses | (678) | (513) | (1,357) | (1,032) |  |
Interest expense | (14,848) | (15,727) | (29,500) | (31,544) |  |
Interest and other income | 652 | 203 | 862 | 345 |  |
Income from continuing operations | 5,017 | 6,616 | 7,432 | 8,163 |  |
Income from discontinued operations | 5,280 | 3,394 | 6,081 | 3,843 |  |
Net income | 10,297 | 10,010 | 13,513 | 12,006 |  |
Segment Assets [Abstract] |  |  |  |  |  |
Property owned | 2,032,747 |  | 2,032,747 |  | 2,032,970 |
Less accumulated depreciation | (431,318) |  | (431,318) |  | (420,421) |
Net property owned | 1,601,429 |  | 1,601,429 |  | 1,612,549 |
Real Estate Held-for-sale | 2,620 |  | 2,620 |  | 0 |
Cash and cash equivalents | 68,727 | 84,258 | 68,727 | 84,258 | 94,133 | 39,989
Other investments | 642 |  | 642 |  | 639 |
Receivables and other assets | 111,158 |  | 111,158 |  | 113,948 |
Development in progress | 90,052 |  | 90,052 |  | 46,782 |
Unimproved land | 21,619 |  | 21,619 |  | 21,503 |
Total Assets | 1,896,247 |  | 1,896,247 |  | 1,889,554 |
Multi-Family Residential [Member] |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |
Real estate revenue | 25,652 | 23,105 | 50,234 | 44,314 |  |
Real estate expenses | 11,275 | 9,009 | 22,234 | 18,301 |  |
Gain on involuntary conversion |  | 2,263 | 966 | 2,263 |  |
Net operating income | 14,377 | 16,359 | 28,966 | 28,276 |  |
Segment Assets [Abstract] |  |  |  |  |  |
Property owned | 722,099 |  | 722,099 |  | 659,696 |
Less accumulated depreciation | (150,427) |  | (150,427) |  | (140,354) |
Net property owned | 571,672 |  | 571,672 |  | 519,342 |
Commercial-Office [Member] |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |
Real estate revenue | 19,367 | 18,815 | 38,681 | 37,169 |  |
Real estate expenses | 9,525 | 9,196 | 19,278 | 18,321 |  |
Gain on involuntary conversion |  | 0 | 0 | 0 |  |
Net operating income | 9,842 | 9,619 | 19,403 | 18,848 |  |
Segment Assets [Abstract] |  |  |  |  |  |
Property owned | 610,183 |  | 610,183 |  | 613,775 |
Less accumulated depreciation | (143,136) |  | (143,136) |  | (138,270) |
Net property owned | 467,047 |  | 467,047 |  | 475,505 |
Commercial-Healthcare [Member] |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |
Real estate revenue | 16,025 | 15,262 | 32,098 | 30,334 |  |
Real estate expenses | 4,129 | 4,180 | 8,412 | 8,259 |  |
Gain on involuntary conversion |  | 0 | 0 | 0 |  |
Net operating income | 11,896 | 11,082 | 23,686 | 22,075 |  |
Segment Assets [Abstract] |  |  |  |  |  |
Property owned | 515,423 |  | 515,423 |  | 501,191 |
Less accumulated depreciation | (98,275) |  | (98,275) |  | (90,891) |
Net property owned | 417,148 |  | 417,148 |  | 410,300 |
Commercial-Industrial [Member] |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |
Real estate revenue | 1,743 | 1,716 | 3,953 | 3,300 |  |
Real estate expenses | 548 | 455 | 1,052 | 944 |  |
Gain on involuntary conversion |  | 0 | 0 | 0 |  |
Net operating income | 1,195 | 1,261 | 2,901 | 2,356 |  |
Segment Assets [Abstract] |  |  |  |  |  |
Property owned | 67,016 |  | 67,016 |  | 125,772 |
Less accumulated depreciation | (12,467) |  | (12,467) |  | (23,688) |
Net property owned | 54,549 |  | 54,549 |  | 102,084 |
Commercial-Retail [Member] |  |  |  |  |  |
Segment revenues and net operating income [Abstract] |  |  |  |  |  |
Real estate revenue | 3,403 | 3,360 | 6,731 | 6,486 |  |
Real estate expenses | 1,038 | 1,209 | 2,363 | 2,289 |  |
Gain on involuntary conversion |  | 0 | 0 | 0 |  |
Net operating income | 2,365 | 2,151 | 4,368 | 4,197 |  |
Segment Assets [Abstract] |  |  |  |  |  |
Property owned | 118,026 |  | 118,026 |  | 132,536 |
Less accumulated depreciation | (27,013) |  | (27,013) |  | (27,218) |
Net property owned | $ 91,013 |  | $ 91,013 |  | $ 105,318 |

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