639-641 18th Ave, San Francisco, CA 94121

The property at 639-641 18th Avenue in the Central Richmond neighborhood is a two-unit, two-story multi-family residential building constructed in 1922 and currently owned by Aaron M. Plantenberg and Lewis. The building has undergone substantial renovations and improvements over the past several years, with major work occurring between 2018 and 2021.

Significant upgrades completed include bathroom and kitchen renovations in both units, electrical panel upgrades, window replacements, and the installation of a comprehensive hydronic heating system with two boilers. The property was also fitted with modern safety features such as a sprinkler monitoring system in late 2019 and two solar PV systems with battery backup units installed in November 2019. More recent concerns have emerged regarding the building's infrastructure, particularly with the sewer system, as evidenced by two sewage back-up incidents reported in 2023 and 2024. The building's renovation history reveals some pattern of permit revisions and expirations, suggesting construction modifications and adjustments to comply with inspection requirements.

A complaint was filed in March 2020 during the COVID-19 pandemic regarding construction activity, though it is unclear if this resulted in any formal action. The property has experienced recurring issues with parking enforcement, particularly regarding driveway blocking, with multiple citations issued between 2022 and 2024. While the building's major systems have received significant upgrades, including electrical rewiring and plumbing improvements, the recent sewer issues may warrant attention. The extensive renovation history demonstrates ongoing investment in the property, though some permits show as completed with other permits having been canceled or marked as "not active."