458-460 12th Ave, San Francisco, CA 94118

The three-story multi-family residential building at 458-460 12th Avenue in San Francisco's Inner Richmond district, owned by Kenneth Lock Trust, was constructed in 1922 and originally contained two units before undergoing significant modifications to add a third dwelling unit. The comprehensive renovation and unit legalization project, initiated in 2016, involved multiple phases of work including the installation of fire sprinklers throughout the building, adding a new basement unit, electrical upgrades, and the installation of a new HVAC system with associated ductwork.

The project also included important safety features such as a sprinkler monitoring system implemented in 2017, with most recent permits for its installation being completed in October 2024. The building underwent considerable infrastructure improvements between 2015 and 2023, including an electrical service upgrade from 125 amps to 200 amps in 2015, bathroom remodels, kitchen updates, and the addition of new retaining walls at the rear of the building. Despite some permits expiring during the process, including electrical and plumbing permits in 2018 and 2022, most jobs have been completed through subsequent renewal permits.

A building complaint was filed in September 2018 regarding illegal unit construction and expansion, though this complaint is currently listed as not active. Recent maintenance issues have included a sidewalk defect reported in April 2023, which was resolved, and a driveway blocking incident in September 2024, though the complaint was deemed invalid due to incomplete reporting information. The property has successfully completed multiple permit renewals and as-built inspections throughout the project timeline, with the most recent being for plumbing and electrical systems in 2023-2024.