1 EXHIBIT 6 AGREEMENT OF JOINT FILING AIMCO Properties, L.P., AIMCO-GP, Inc., Apartment Investment and Management Company, Insignia Properties, L.P., AIMCO/IPT, Inc., and IPLP Acquisition I, L.L.C. agree that the Amendment No. 21 to Schedule 13D to...Joint Filing Agreement • February 8th, 2001 • Aimco Properties Lp • Operators of apartment buildings
1 ACKNOWLEDGMENT AND AGREEMENT TO TENDER UNITS OF LIMITED PARTNERSHIP UNITS OF NATIONAL PROPERTY INVESTORS 4 (THE "PARTNERSHIP") PURSUANT TO AN OFFER TO PURCHASE DATED FEBRUARY 8, 2001(THE "OFFER DATE")BY AIMCO PROPERTIES, L.P. ----...Acknowledgment and Agreement to Tender Units of Limited Partnership • February 8th, 2001 • Aimco Properties Lp • Operators of apartment buildings
