4248 20th St, San Francisco, CA 94114

The 5-unit, 2-story apartment building at 4248 20th Street, owned by Catherine M. Chrastil, was constructed in 1915 and is located in the Eureka Valley/Dolores Heights neighborhood. The property has undergone several significant safety and infrastructure improvements over the past two decades, with the most recent being a comprehensive fire alarm system upgrade in November 2023 costing approximately $15,000.

This upgrade included new low-frequency sounders in sleeping areas and system compatibility improvements, following earlier fire system certification violations from 2007. The building successfully completed its mandatory soft-story retrofit in 2017, demonstrating compliance with modern seismic safety requirements. Historical records from 2000-2006 show a period of maintenance and compliance issues that have since been resolved, including repairs to stairs, window repairs, and addressing lead paint concerns.

During this period, the building underwent routine housing inspections that identified various interior surface and safety issues, all of which were abated by February 2007. Subsequent improvements include a 200-amp overhead service installation in 2016 and water heater safety inspections in 2014. The most recent inspection-related issues appear to be addressed, with no active violations or complaints on record since 2014. While there have been several 311 calls regarding the property's street and sidewalk area between 2020 and 2024, these were primarily related to public space maintenance matters rather than building-specific issues.