The Hunter–Dulin Building (also known as the California Commercial Wool Building or 111 Sutter Street) is a class A office building located at 111 Sutter Street in San Francisco, California.

The 25-story, 94 m (308 ft) tall building was completed in 1927. It was listed on the National Register of Historic Places on April 17, 1997.^[7] The building was totally restored and renovated between 1999 and 2001.^{[citation needed]}

The building served as the West Coast headquarters for the National Broadcasting Company from 1927 to 1942;^[8] the executive offices were located on the 21st floor and the studio offices were located on the 22nd. The 22nd floor was later occupied by peer-to-peer lending firm Prosper Marketplace. ^{[citation needed]}

111 Sutter Street was the fictional location of the "Spade & Archer" detective agency in Dashiell Hammett's 1930 book, "The Maltese Falcon". According to Hammett, Sam Spade's office was located on the 5th floor.^{[citation needed]}

As of May 2023, during what the San Francisco Chronicle described as "Downtown San Francisco['s] worst office vacancy crisis on record," 111 Sutter Street had a vacancy rate of 43.9%.^[9]

• "1926, Financial District, Hunter–Dulin Building". Vernacular Language North. 7 October 2005. Retrieved 1 September 2010.