6409-6411 California St, San Francisco, CA 94121

The two-unit residential building at 6409-6411 California Street, located in San Francisco's Central Richmond neighborhood, is a 2-story flats/duplex structure built in 1923, currently owned by the Helen D Katzenmeyer Revocable Trust. The property has undergone several significant improvements over the past decade, including a major interior renovation in 2018 that involved structural modifications to remove a load-bearing wall and install new supports, as well as kitchen improvements costing $20,000. Previous upgrades included a comprehensive window replacement project in 2010 ($17,081), bathroom and kitchen updates in 2010 ($5,500), and an electrical service upgrade in 2007 ($15,000).

A notable construction complaint was filed in August 2010 regarding unauthorized work, though this was quickly addressed within a week. Recent tenant activity includes a buyout at 6409 California Street in June 2017 for $59,500 involving two tenants. The building has experienced various maintenance and service issues over the years, with the most recent concerns in 2023 involving noise complaints and parking issues.

The property has also seen some environmental challenges as evidenced by 2019 reports of medical waste and general street cleaning needs. While multiple street space permits have been issued, the building's overall maintenance record shows regular upkeep, with most recent complaints being non-structural in nature. The building's utilities and structural systems appear to have received regular updates, with significant investments in electrical systems, window replacement, and interior improvements over the years, suggesting proactive maintenance by the ownership.