4345-4347 20th St, San Francisco, CA 94114

The property at 4345-4347 20th Street is a four-story, three-unit multi-family residential building constructed in 1910, currently owned by Gercek Karakus and A Melis Ok. The building's maintenance history shows regular upkeep, with recent improvements including the installation of retrofit vinyl windows in 2024 and previous termite treatment completed in 2003. However, significant concerns have emerged regarding an unauthorized basement unit, as evidenced by a February 2024 complaint that documented numerous code violations, including improper ceiling height, unauthorized construction, and safety equipment deficiencies.

This basement unit allegedly features its own kitchen, bathroom, and sleeping area, despite the building's legal classification as an R-3 two-family dwelling. The property has experienced recurring maintenance issues, with an active complaint from 2014-2015 regarding broken light fixtures, weather-proofing problems, and other electrical concerns. A notable incident occurred in January 2016, when unauthorized structural work was reported, though this complaint is now inactive.

Historical improvements include a kitchen remodel in 1984, window replacements in 1991, and various plumbing and roofing work completed in the early 2000s. Recent exterior improvements include the replacement of three windows in 2024 with energy-efficient retrofit vinyl windows. The building has also undergone some infrastructure updates, including waterline replacement in 2007. The property has generated several service requests, including a sidewalk parking complaint in 2022 and two public works complaints in 2018, all of which were resolved.