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DISCONTINUED OPERATIONS (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2013 | Jan. 31, 2012
DISCONTINUED OPERATIONS [Abstract] |  |  |  |
Number of multi-family residential properties sold |  |  | 2 |
REVENUE |  |  |  |
Real estate rentals | $ 54,307,000 | $ 49,859,000 | $ 159,026,000 | $ 147,663,000
Tenant reimbursement | 11,924,000 | 10,687,000 | 34,134,000 | 32,247,000
TOTAL REVENUE | 66,231,000 | 60,546,000 | 193,160,000 | 179,910,000
EXPENSES |  |  |  |
Depreciation/amortization related to real estate investments | 15,506,000 | 14,280,000 | 46,602,000 | 42,470,000
Utilities | 4,759,000 | 4,457,000 | 13,816,000 | 13,249,000
Maintenance | 7,692,000 | 6,338,000 | 21,545,000 | 19,991,000
Real estate taxes | 8,730,000 | 7,993,000 | 25,358,000 | 23,374,000
Insurance | 1,070,000 | 876,000 | 2,932,000 | 2,514,000
Property management expenses | 4,124,000 | 4,926,000 | 12,369,000 | 15,631,000
Impairment of Real Estate |  |  | 0 | 135,000
Other expenses | 464,000 | 359,000 | 1,496,000 | 1,509,000
Amortization related to non-real estate investments | 794,000 | 903,000 | 2,426,000 | 2,395,000
TOTAL EXPENSES | 45,384,000 | 41,791,000 | 132,946,000 | 127,077,000
Interest expense | (15,725,000) | (16,411,000) | (48,448,000) | (48,389,000)
Interest income | 70,000 | 25,000 | 176,000 | 115,000
Gain on sale of discontinued operations |  |  | 3,452,000 | 589,000
INCOME FROM DISCONTINUED OPERATIONS | 776,000 | (102,000) | 3,530,000 | 496,000
Discontinued Operations [Member] |  |  |  |
REVENUE |  |  |  |
Real estate rentals | 27,000 | 459,000 | 778,000 | 1,375,000
Tenant reimbursement | 0 | 18,000 | 0 | 54,000
TOTAL REVENUE | 27,000 | 477,000 | 778,000 | 1,429,000
EXPENSES |  |  |  |
Depreciation/amortization related to real estate investments | 0 | 79,000 | 114,000 | 248,000
Utilities | 4,000 | 69,000 | 67,000 | 175,000
Maintenance | 5,000 | 57,000 | 132,000 | 194,000
Real estate taxes | 3,000 | 56,000 | 78,000 | 154,000
Insurance | 1,000 | 14,000 | 24,000 | 38,000
Property management expenses | 6,000 | 63,000 | 118,000 | 207,000
Impairment of Real Estate | 0 | 135,000 | 0 | 135,000
TOTAL EXPENSES | 19,000 | 473,000 | 533,000 | 1,151,000
Operating Income | 8,000 | 4,000 | 245,000 | 278,000
Interest expense | (6,000) | (122,000) | (169,000) | (387,000)
Disposal Group Including Discontinued Operation Other Income | 2,000 | 16,000 | 2,000 | 16,000
Income from discontinued operations before gain on sale | 4,000 | (102,000) | 78,000 | (93,000)
Gain on sale of discontinued operations | 772,000 | 0 | 3,452,000 | 589,000
INCOME FROM DISCONTINUED OPERATIONS | $ 776,000 | $ (102,000) | $ 3,530,000 | $ 496,000

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