250-260 5th St, San Francisco, CA 94103

The Mosso Apartments, a multi-family residential building owned by Bprep Mosso Apartments LLC, is located at 250-260 5th Street in the South of Market neighborhood. The property has experienced significant infrastructure challenges in recent years, particularly in 2024, when residents reported ongoing plumbing issues including water heater leaks, building-wide plumbing problems causing monthly water blackouts, and inconsistent hot water availability. These plumbing issues have been documented as occurring at least once a month over three years, with recent complaints in 2024 noting substantial increases in water heating costs. Additionally, there are active boiler permit violations from 2022-2024 that were not fully resolved until January 2024.

The building has undergone various improvements and modifications over the years, including fire safety system upgrades, dental office renovations, and electrical system enhancements. Most notably, there have been multiple fire code violations issued between 2021 and 2024, including issues with fire suppression systems, alarm systems, and documentation requirements. The building's fire safety systems have experienced several false alarms and system malfunctions, though no civilian injuries have been reported from fire incidents. Recent inspections in early 2024 identified multiple fire safety violations requiring correction, including issues with standpipes, alarm systems, and documentation requirements.

The property has also faced elevator safety concerns, with complaints about braking mechanisms and stalled elevators, along with periodic heating system failures and construction-related noise disturbances. The building's recent history suggests ongoing challenges with building systems and maintenance, particularly regarding water infrastructure and fire safety compliance. While some violations and complaints have been addressed, there remain active concerns that affect resident comfort and building safety. The property has undergone substantial improvements over the years, including the installation of new electrical systems, fire safety upgrades, and various tenant improvements, though these improvements have been accompanied by ongoing maintenance and compliance challenges.