427-431 Pierce St, San Francisco, CA 94117

The three-story, five-unit multi-family residential building at 427-431 Pierce Street in Hayes Valley, owned by Mufarreh Basil & Susanne Fm, has undergone several significant modifications since its construction in 1903. Most notably, between 2017 and 2022, the basement was converted into a living area with the addition of a new two-bedroom, two-bathroom residential unit, complete with radiant heating and a fire sprinkler system, at a total cost exceeding $160,000. This project included the installation of NFPA 13 fire sprinklers and new electrical wiring, demonstrating compliance with modern safety standards.

However, there are some concerning ongoing issues, most notably a 2020 complaint regarding the building's potential classification as a soft-story structure that remains active in the system. Recent incidents include a May 2023 complaint about a dangerous broken window with dangling glass, though this was promptly addressed by June 2023. The building has a history of maintenance and safety concerns, particularly in the early 2000s, when multiple violations were recorded regarding heating, floor covering, fire escape maintenance, and lead paint hazards.

These issues were generally resolved by July 2008, along with approximately $20,000 in exterior deck repairs for dry rot and structural issues completed in 2007. More recent records show regular inspection activity and prompt response to maintenance issues. The property has also experienced some external challenges, including multiple graffiti incidents in 2024 and a pavement defect report in 2018. The building's history of renovation and compliance work, including the 2017 basement unit addition and associated safety improvements, suggests ongoing investment in maintaining and upgrading the property, though the unresolved soft-story classification remains a notable concern.