The San Francisco Museum of Modern Art has selected four leading architectural firms—Adjaye Associates, Diller Scofidio + Renfro, Foster + Partners and Snø-hetta—as finalists following a comprehensive international search for a firm to expand the museum’s facilities and design a new wing. The final selection of the architect will be announced in September, and the expansion is slated for completion in 2016. The expansion will triple the museum’s gallery and public spaces.