435-437 Union St, San Francisco, CA 94133

The three-unit residential building at 435-437 Union Street in Telegraph Hill is a three-story flats and duplex structure built in 1906, currently owned by Daniel Sullivan. The property has undergone several significant improvements over the years, with the most recent major work occurring in 2021 involving a kitchen renovation in Unit #2 that included electrical upgrades and plumbing work costing $15,000, though this project generated multiple complaints in April 2021 regarding unpermitted work and construction noise affecting multiple units.

Prior improvements include substantial fire safety upgrades in 2005, with the installation of both underground and above-ground fire sprinkler systems in the garage, followed by various electrical and bathroom renovation work between 2004-2006. The building has maintained relatively good compliance with safety regulations, though there was one notable incident in 2009 involving an expired backflow prevention device certification that was promptly resolved within two weeks.

Recent property condition reports from 2025 indicate some exterior maintenance issues, including a collapsed sidewalk, though this appears to be a public infrastructure matter rather than a building maintenance issue. The property has experienced periodic street cleaning and debris concerns in 2022-2025, primarily involving sidewalk maintenance and litter issues, which are not directly related to the building's structural or maintenance conditions. The only recorded fire-related incident was a malfunctioning CO detector activation, which resulted in no civilian injuries.