三菱地所
Construction of PacWest Center began in October 1982, and the building was formally dedicated on November 1, 1984. The building's name is derived from former anchor tenant, Pacific Western Bank of Oregon, owned by PacWest Bancorp. However, PacWest's Oregon operations were acquired by KeyCorp in 1986 and became part of KeyBank. Tokyo-based Mitsubishi Estate Co. had been the majority owner in the building since it rose in 1984.