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MORTGAGES PAYABLE AND LINE OF CREDIT (Details) (USD $) | 9 Months Ended |
--- | --- | ---
Jan. 31, 2013 | Apr. 30, 2012
MORTGAGES PAYABLE AND LINE OF CREDIT [Abstract] |  |
Interest rates on mortgages payable range, minimum (in hundredths) | 2.51% |
Interest rates on mortgages payable range, maximum (in hundredths) | 8.25% |
Mortgages maturity date range, end | Jul. 01, 2036 |
Fixed rate mortgages | $ 1,000,000,000 | $ 1,000,000,000
Variable rate mortgages | 37,100,000 | 16,200,000
Weighted average rate of interest on mortgage debt (in hundredths) | 5.65% | 5.78%
Aggregate amount of required future principal payments on mortgages payable [Abstract] |  |
2013 (remainder) | 10,009,000 |
2014 | 64,524,000 |
2015 | 112,886,000 |
2016 | 92,221,000 |
2017 | 197,947,000 |
Thereafter | 564,036,000 |
Total payments | 1,041,623,000 | 1,048,689,000
Lending commitments | 60,000,000 |
Number of properties securing line of credit | 23 |
Line of credit, current interest rate (in hundredths) | 5.15% |
Line of credit, minimum outstanding principal balance | 10,000,000 |
Minimum depository accounts | 6,000,000 |
Non-interest bearing account | $ 1,500,000 |

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