CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 5,585	$ 24,041
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	46,328	45,951
Gain on sale of real estate, land and other investments	(589)	(19,365)
Impairment of real estate investments	135	0
Bad debt expense	771	487
Changes in other assets and liabilities:
Increase in receivable arising from straight-lining of rents	(3,370)	(1,441)
Decrease (increase) in accounts receivable	946	(4,033)
Increase in prepaid and other assets	(1,756)	(1,663)
(Increase) decrease in tax, insurance and other escrow	(901)	630
Increase in deferred charges and leasing costs	(5,480)	(5,015)
Increase (decrease) in accounts payable, accrued expenses, and other liabilities	2,759	(1,208)
Net cash provided by operating activities	44,428	38,384
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from real estate deposits	1,640	2,297
Payments for real estate deposits	(1,889)	(2,035)
Principal proceeds on mortgage loans receivable	159	1
(Increase) decrease in other investments	(8)	95
Decrease in lender holdbacks for improvements	5,056	968
Increase in lender holdbacks for improvements	(315)	(10,764)
Proceeds from sale of real estate - discontinued operations	2,088	81,539
Proceeds from sale of real estate and other investments	438	0
Insurance proceeds received	5,644	329
Payments for acquisitions and improvements of real estate investments	(101,791)	(55,437)
Net cash (used) provided by investing activities	(88,978)	16,993
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from mortgages payable	84,195	97,654
Principal payments on mortgages payable	(53,661)	(160,632)
Principal payments on revolving line of credit and other debt	(60)	(25,650)
Proceeds from revolving line of credit and other debt	24,227	36,300
Proceeds from sale of common shares, net of issue costs	2,970	16,384
Proceeds from sale of common shares under distribution reinvestment and share purchase program	20,778	1,774
Repurchase of fractional shares and partnership units	(13)	(10)
Payments for acquisition of noncontrolling interests - consolidated real estate entities	(1,289)	(425)
Distributions paid to common shareholders, net of reinvestment of $7,548 and $7,831, respectively	(27,885)	(32,300)
Distributions paid to preferred shareholders	(1,779)	(1,779)
Distributions paid to noncontrolling interests - Unitholders of the Operating Partnership, net of reinvestment of $504 and $525, respectively	(8,009)	(9,840)
Distributions paid to noncontrolling interests - consolidated real estate entities	(586)	(737)
Distributions paid to redeemable noncontrolling interests - consolidated real estate entities	(27)	0
Net cash provided (used) by financing activities	38,861	(79,261)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(5,689)	(23,884)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	41,191	54,791
CASH AND CASH EQUIVALENTS AT END OF PERIOD	35,502	30,907
SUPPLEMENTARY SCHEDULE OF NON-CASH INVESTING AND FINANCING
Distribution reinvestment plan	7,548	7,831
Operating partnership distribution reinvestment plan	504	525
Real estate investment acquired through the issuance of operating partnership units	2,469	3,252
Operating partnership units converted to shares	3,454	6,007
Real estate investment acquired through assumption of indebtedness and accrued costs	7,190	4,288
Adjustments to accounts payable included within real estate investments	(3,244)	(1,421)
Noncontrolling partnership interest	2,227	0
Fair value adjustments to redeemable noncontrolling interests	35	(570)
Involuntary conversion of assets due to flood damage	2,638	0
Construction debt reclassified to mortgages payable	7,190	0
Cash paid during the year for:
Interest on mortgages	45,321	48,340
Interest other	2,098	892
Cash paid during the period, total	$ 47,419	$ 49,232