437-439 Diamond St, San Francisco, CA 94114

The two-unit residential building at 437-439 Diamond Street, owned by Derek W. Kozacko, is a two-story flats and duplex structure built in 1963 in the Eureka Valley/Dolores Heights neighborhood. The property has undergone several significant improvements over the years, most notably a comprehensive renovation of unit 439 in 2012-2013 that included bathroom and kitchen remodels, new plumbing and electrical systems, and the installation of radiant floor heating and solar water systems.

More recent upgrades include the installation of a heat pump mini-split system in 2024, a sewer replacement in 2020, and the addition of solar PV systems in 2016. The building has also received maintenance attention, including wood siding replacement and dry rot repair in 2018. The property has experienced some regulatory scrutiny, with a housing inspection complaint filed in 2011 regarding a possible illegal unit, though this was later abated in 2012.

Multiple building permits from 2015 show efforts to close out previously expired permits, indicating attention to regulatory compliance. The electrical systems have been upgraded over time, including the replacement of an existing subpanel and the correction of code violations in 2010. Recent parking-related issues have been documented through multiple 311 calls, though these primarily involve street-related matters rather than building concerns. The building appears to have been maintained in compliance with permit requirements, with most recent work being properly permitted and completed, including recent heating system installations and solar improvements.