The San Francisco Federal Building is an 18-story, 71.3 m (234 ft) skyscraper at 90 7th Street on the corner of Mission and 7th streets in the South of Market neighborhood of San Francisco, California. The building was designed by the Morphosis architectural firm, as a supplement to the Phillip Burton Federal Building at 450 Golden Gate Avenue. Thom Mayne of Morphosis designed the building using a juxtaposition of gray concrete walls, perforated metal panels, and custom, faceted wood ceilings.