83 21st Avenue in San Mateo presents a rare opportunity to acquire a versatile mixed-use asset in one of the Peninsula’s most supply-constrained submarkets. Offering a blend of income stability and future flexibility, the building caters to both owner-users and investors seeking a strategic foothold in a prime infill location. The property encompasses a well-configured industrial footprint with ground-floor shop and storage areas, complemented by a second-floor office or optional living-ready environment complete with kitchen facilities, restrooms, a shower, and a sauna. This adaptable configuration allows a future owner to seamlessly integrate workspace, operations, and potential live-work functionality under one roof.