A rent-controlled unit is one where annual rent increases are capped by San Francisco’s Rent Ordinance (generally buildings built before June 1979). Long-term tenants often pay significantly below market rent, which affects short-term cash flow. Rent control affects property valuation because buyers factor both restricted current income and long-term appreciation upside into the price. Managed well, rent-controlled buildings are stable assets in strong neighborhoods. I help investors understand how tenant profiles and rent levels shape both current value and future potential.