One Market Plaza is a complex of three office buildings at 1 Market Street along the San Francisco Embarcadero. The historic 11-story Southern Pacific Building, also known as "The Landmark", was completed in 1916, and incorporated into the development in 1976 that includes the 43-storey 172 m Spear Tower, and the 27-storey, 111 m Steuart Tower. The complex was renovated in 1996 by the architect firm César Pelli & Associates Architects.