Downtown San Diego Partnership Clean & Safe in downtown San Diego operates one of the largest Property and Business Improvement Districts in the United States, deploying more than 120 full-time employees across 275 city blocks with a $12 million annual budget. Its enhanced-services model layers graffiti removal, power washing, and safety-ambassador patrols on top of baseline city services, a public-private accountability structure tracked by San Diego County Taxpayers Association as part of its municipal-spending oversight. The program has operated continuously since the late 1990s under the Downtown San Diego Partnership umbrella, expanding from basic streetscape maintenance into a comprehensive unhoused-care division that conducts welfare checks, connects individuals to shelter beds, and coordinates with outreach teams from the city's Housing Commission. Clean & Safe's data-driven deployment model uses real-time incident mapping to route ambassadors to hotspot blocks, generating the kind of granular neighborhood metrics that Voice of San Diego incorporates into its civic-accountability reporting. The district's most resource-intensive operations involve post-event deep-cleaning deployments after major conventions at the San Diego Convention Center and multi-night street festivals in the Gaslamp Quarter, coordinating overnight power-washing crews, waste-hauling contractors, and next-morning ambassador surges across dozens of blocks simultaneously.