Following a proposal by Chloethiel Woodard Smith and Louis Justement, renewal in Southwest marked one of the last great efforts of the late Modernist movement. Architect I. M. Pei developed the initial urban renewal plan and was responsible for the design of multiple buildings, including those comprising L’Enfant Plaza and two clusters of apartment buildings located on the north side of M St. SW (initial termed Town Center Plaza). Various firms oversaw individual projects and many of these represent significant architectural contributions. Noted modernist Charles M. Goodman designed the River Park Mutual Homes complex. Likewise, Harry Weese designed the new building for Arena Stage and Marcel Breuer the Robert C. Weaver Federal Building (located at 451 Seventh Street, SW) to house the newly established United States Department of Housing and Urban Development, and the Hubert H. Humphrey Federal Building. The Tiber Island complex (the design of which was essentially replicated in the adjacent projects that are now termed Carrollsburg A Condominium and Carrollsburg Square), which was designed by Keyes, Lethbridge & Condon, won an American Institute of Architects Honor Award in 1966.