Photo courtesy Metro The L.A. Metropolitan Transportation Authority staff has recommended a master plan by UK-based Grimshaw Architects and local firm Gruen Associates. Los Angeles’ major transit hub, the historic Union Station, is one step closer to a massive expansion. Image courtesy Metro Grimshaw Architects and Gruen Associates' vision plan for L.A.'s Union Station and the surrounding area. The Metropolitan Transportation Authority (Metro) staff has recommended UK-based Grimshaw Architects and local firm Gruen Associates to develop a master plan for the project. In April 2011, Metro acquired the station and 40 surrounding acres from a private developer for $75 million.