Market Square

San Francisco, United States

Exterior only

Visible from the street; the inside is private.

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Market Square, located at 1355 Market Street in San Francisco's Mid-Market neighborhood, is an Art Deco office building completed in 1937. Originally designed as the Western Furniture Exchange and Merchandise Mart to serve as a showroom for furniture retailers and wholesalers, the building was substantially converted into office and retail space in the early twenty-first century. It gained widespread recognition as the longtime headquarters of Twitter, Inc. and its successor X Corp., a role it maintained until 2024.