ACKNOWLEDGMENT AND AGREEMENT TO TENDER UNITS OF LIMITED PARTNERSHIP IN SECURED INCOME L.P. (THE "PARTNERSHIP") PURSUANT TO AN OFFER TO PURCHASE DATED SEPTEMBER 1, 2004 (THE "OFFER DATE") BY AIMCO/BETHESDA HOLDINGS ACQUISITIONS, INC.Acknowledgment and Agreement to Tender Units of Limited Partnership • September 1st, 2004 • Aimco Properties Lp • Operators of apartment buildings
