810-812 Diamond St, San Francisco, CA 94114

The two-unit residential building at 810-812 Diamond Street in Noe Valley, owned by Arturo J P Condemarin & Ana, has undergone several significant transformations since its construction in 1900. Most notably, there is an active permit from November 2021 proposing to convert the first-floor business space into a second residential unit, which would add to the existing second-floor unit.

The building has experienced recurring plumbing issues, with a significant sewer backup incident in February 2020 that affected both the property and neighboring buildings, though this was resolved by May 2020 through infrastructure work that included the installation of new cast iron pipes. The property has seen various maintenance and improvement projects over the years, including window replacements (eight wood retrofit windows in 2020), dry-rot repairs (2010), multiple interior renovations (1999-2000), and earlier upgrades such as aluminum window installation in 1990. The building's history reveals both routine maintenance and some more serious issues that have required attention.

In addition to the plumbing problems, there were some unauthorized electrical modifications in 2004 involving floor-mounted receptacles. Recent activity includes multiple 311 calls regarding sewer issues in 2020, with at least four separate incidents reported between February and September of that year. The property is currently subject to an active permit for the proposed conversion to increase residential units, representing the most significant recent change to the building's use structure.