507-511 Duboce Ave, San Francisco, CA 94114

The property at 507-511 Duboce Avenue is a two-story multi-family residential building constructed in 1900, containing 5 units and owned by Daniel J. Wong and William J. Wong. The building has undergone several significant renovations and improvements over its history, with the most substantial work occurring in 2006 when foundation and floor repairs, accessible hallway improvements, and underfloor ventilation installation were completed at a cost of $13,000.

In 2015, a notable project involved restroom barrier removal and the installation of water-conserving plumbing fixtures, valued at $25,000. The ground floor commercial space has undergone multiple upgrades, including electrical work for a cafe in 2005-2006, with installations of new power systems and lighting. The building has a history of fire safety concerns, though all were resolved in a timely manner. In 2002, multiple violations related to fire escape maintenance, rooftop safety, gas meter requirements, and smoke detection systems were identified but were all abated by September 27, 2002.

A 2011 routine inspection led to a determination of the property being a "nuisance" due to violations, though these were also resolved. The property experienced two gas leak incidents requiring fire department response, though no civilian injuries were reported. Recent activity at the property includes multiple 311 calls in late 2024/early 2025 regarding street conditions, illegal postings, and public works matters, though these are primarily related to exterior maintenance rather than building-specific issues. The building appears to be actively managed, with most violations being promptly addressed and resolved.