Exhibit 99.1 SELECTED QUARTERLY FINANCIAL INFORMATION (Unaudited) Selected quarterly information for the years ended December 31, 1997 and 1996 is as follows (in thousands, except per share amounts): Quarter Ended ---------------------------------------------------- 1997 December 31 September 30 June 30 March 31 - ----------------------- ----------- ------------ --------- ---------- Revenues from Rental Operations $ 70,980 $ 56,218 $ 51,586 $ 50,918 Revenues from Service Operations $ 7,393 $ 5,917 $ 5,129 $ 3,939 Net income available for common shares $ 19,406 $ 16,911 $ 14,696 $ 14,986 Basic income per common share (2) $ 0.26 $ 0.26 $ 0.23 $ 0.24 Diluted income per common share (2) $ 0.25 $ 0.26 $ 0.23 $ 0.24 Weighted average common shares (2) 75,466 65,309 63,168 61,624 Weighted average common and dilutive potential common shares (2) 86,649 72,971 70,576 69,579 Funds From Operations (1) $ 33,126 $ 26,007 $ 24,406 $ 23,717 Cash flow provided by (used by): Operating activities $ 49,057 $ 38,676 $ 42,489 $ 28,973 Investing activities (216,788) (205,129) (134,244) (41,163) Financing activities 3,952 337,478 81,865 19,853 1996 - ------------------------ Revenues from Rental Operations $ 46,451 $ 41,448 $ 37,724 $ 36,537 Revenues from Service Operations $ 5,404 $ 5,042 $ 5,137 $ 4,346 Net income available for common shares $ 15,447 $ 13,478 $ 12,299 $ 9,648 Basic income per common share (2) $ 0.26 $ 0.23 $ 0.21 $ 0.20 Diluted income per common share (2) $ 0. 26 $ 0.23 $ 0.21 $ 0.20 Weighted average common shares (2) 58,910 58,714 58,288 48,568 Weighted average common and dilutive potential common shares (2) 66,885 66,503 66,370 57,778 Funds From Operations (1) $ 20,966 $ 20,202 $ 19,088 $ 15,823 Cash flow provided by (used by): Operating activities $ 26,032 $ 29,987 $ 24,647 $ 14,469 Investing activities (74,241) (108,909) (13,733) (79,865) Financing activities 41,620 90,559 (22,718) 71,759 (1) Funds From Operations is defined by the National Association of Real Estate Investment Trusts as net income or loss excluding gains or losses from debt restructuring and sales of property plus depreciation and amortization, and after adjustments for minority interest, unconsolidated partnerships and joint ventures (adjustments for minority interest, unconsolidated partnerships and joint ventures are calculated to reflect Funds From Operations on same basis). Funds From Operations does not represent cash flow from operations as defined by generally accepted accounting principles, should not be considered as an alternative to net income as an indicator of the Company's operating performance, and is not indicative of cash available to fund all cash flow needs. (2) Amounts adjusted to reflect the Company's two-for-one stock split effected in August 1997.