Market Square (San Francisco)

Market Square
The building in May 2023
Map
Former namesWestern Furniture Exchange and Merchandise Mart
San Francisco Mart
Alternative namesTwitter Building
General information
Architectural styleArt Deco
(Additional elements of Mayan Revival and International Style)
Address1355 Market Street
Town or citySan Francisco, California
CountryUnited States
Coordinates37°46′35″N 122°25′01″W / 37.77639°N 122.41694°W / 37.77639; -122.41694
Year(s) built1936–1937
OpenedJuly 31, 1937 (Dedication ceremony)
August 3, 1937 (Official opening)
Owner
LandlordShorenstein Properties
Technical details
Floor count11
Floor area1,000,000 square feet (93,000 m2)
Design and construction
Architecture firmCapital Co. Architects

Market Square (formerly the Western Furniture Exchange and Merchandise Mart, the San Francisco Mart, and, colloquially, the Twitter Building) is an Art Deco building in the Mid-Market neighborhood of San Francisco, California, United States. Located at 1355 Market Street, it was constructed in 1937 and originally served as a showroom for retailers and wholesalers in the furniture industry. In the early 21st century, the building underwent an extensive conversion into office and retail space, and is most well known as the former headquarters of Twitter, Inc. and its successor X Corp. until 2024.