157 Prospect Ave, San Francisco, CA 94110

157 Prospect Avenue is a three-story, two-unit multi-family residential building located in Bernal Heights, constructed in 1902 and currently owned by Jonathan and Samantha Wiesler. The property is notable for undergoing significant improvements following a serious fire incident in September 2016 that caused structural damage to the top floor and required extensive repairs to address electrical, plumbing, and water damage across multiple floors.

In the aftermath, the building was fully renovated with comprehensive safety upgrades including the installation of a 38-head fire sprinkler system (completed in 2018), a battery backup system with Tesla Powerwall, rooftop solar PV system, and modernized electrical panels. The renovation project, which began in 2018 and continued through 2020, included substantial infrastructure improvements such as new in-floor radiant heating systems, plumbing upgrades for four bathrooms and two kitchens, and the installation of gas fireplaces. The building's safety features were further enhanced with the installation of fire sprinkler waterflow monitoring systems and new underground fire lines.

Additional improvements included interior modifications such as rear infill, new dormers, and a roof deck addition. Recent 311 calls primarily relate to parking issues and street maintenance matters, with no active building violations or safety concerns recorded since 2021. Planning records indicate completed projects focused on enhancing the building's safety systems and modernizing its infrastructure, with no significant pending issues.