The current U.S. Embassy building in Tokyo was completed in August, 1976, and opened on September 6. The building was designed by César Pelli and Norma Merrick Sklarek of Gruen Associates and constructed by Obayashi Corporation. Gruen Associates was responsible for the 45,000 sq. ft. Embassy building as well as a three-story wing. The project was completed for the US Department of State’s Office of Foreign Buildings Operations.