1 EXHIBIT 10.21 TWENTIETH AMENDMENT TO THE THIRD AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF AIMCO PROPERTIES, L.P. This TWENTIETH AMENDMENT TO THE THIRD AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF AIMCO PROPERTIES, L.P.,...Third Amended and Restated Agreement of Limited Partnership • April 30th, 2001 • Apartment Investment & Management Co • Real estate investment trusts
