Monadnock Building, Office building in the Financial District, San Francisco, US

The Monadnock Building is a 10-story office building at 685 Market Street in downtown San Francisco, completed in 1907 to designs by the firm of Frederick H. Meyer and Smith. Its facade of light tan brick and stone rises in a grid of rectangular windows above a large rounded arch with layered stone molding, flanked by rusticated stone blocks. Dark lettering reading "MONADNOCK" sits on a black band above the glass entrance doors, with plaques marked "685 MARKET STREET" on either side.

The Monadnock Building was designed by the firm of Frederick H. Meyer and Smith and completed in 1907, immediately after the 1906 San Francisco earthquake. It was extensively renovated in 1986 and again in 2016. Uber became a major tenant in 2014, and the technology firm Notion leased space in 2024 and then indicated it would take over the entire building.

The building's name comes from Mount Monadnock in New Hampshire, a name shared with the earlier Chicago skyscraper. Its 1907 completion right after the 1906 earthquake made it a symbol of the city's rapid rebuilding. Today visitors find the "MONADNOCK" lettering and "685 MARKET STREET" plaques at the arched entrance, and the building houses offices including Macys.com and, from 2014, Uber.

The building is accessible from multiple street entrances and can be explored from the outside to see both the massive walls and the different facade styles. Walking around the entire block gives you the best view of how the two sections contrast with each other.

The Monadnock Building was completed in 1907, right after the 1906 earthquake, and was designed by the firm of Frederick H. Meyer and Smith. It stands beside the BART Montgomery Street Station and the Palace Hotel, across Market Street from Lotta's Fountain. Technology firm Notion leased space in 2024 and then indicated it would take over the entire building.