The San Francisco Federal Building is a building designed by the architectural firm Morphosis. It is located at 90 7th Street on the corner of Mission and 7th Streets in South of Market, San Francisco. Thom Mayne of Morphosis designed the building using a concept of "resistance," juxtaposing gray concrete walls with custom, zig-zagged 9Wood wood ceilings. The building was expected to be completed in 2005, but construction issues and delays pushed the project completion to 2007. The building has 18 floors of office space and stands 234 feet (71 m) tall. The building was designed to be a 'green' building consuming less than half the power of a standard office tower -- an indication of how building design can help slash emissions of greenhouse gases. It is the first naturally ventilated office building on the west coast since the advent of air conditioning. The building features elevators which stop on every third floor to promote employee interaction and health.