A full decarbonization project completed on a four-unit residential building in San Francisco (conducted over two years with active city support) provides one of the clearest documented examples of what coordinated multifamily electrification actually requires in practice. The project involved acquiring and installing equipment across all units, coordinating among residents, navigating variability in unit conditions and occupant circumstances, managing public outreach, and sustaining momentum over a multi-year timeline. The experience confirmed that multifamily electrification is technically achievable, but that the split-incentive problem, coordination complexity, and maintenance transition burden make it categorically different from single-family retrofit work. It cannot be addressed through individual household incentive programs alone; it requires a coordinated effort involving the building owner, residents, local government, and program administrators working together over an extended period. The pilot’s success, achieved specifically because the city provided sustained coordination support, makes the case for embedding active coordination capacity within any program targeting multifamily building stock.