Nestled in the heart of San Francisco's iconic Russian Hill, 1553-1557 Mason Street presents a rare and exceptional opportunity to own a true trophy building in one of the city's most coveted neighborhoods. Owned by a long-standing San Francisco family for generations, this well-maintained three-unit property offers a unique blend of charm, versatility, and income potential. The building consists of three full-floor flats, each with its own distinct character. Ideal for both owner-occupiers and investors, the layout allows for flexible living or leasing strategies. The middle unit is particularly noteworthy configured into seven single rooms, it provides an opportunity to maximize cash flow through individual room rentals. Whether you're looking to live in one unit and lease the others or seeking a fully income-producing asset, this property adapts to your goals with ease. Adding to its appeal is a large, flexible-use basement space, formerly utilized as a gym. Located just steps away from the best of North Beach and Russian Hill, this property boasts a 99 Walk Score - steps to local hotspots like Tony's Pizza, Original Joe's, and an array of neighborhood cafs, parks, and boutiques. OPEN HOUSE starting 5/11 Sat 2-4pm,Tue 9-11am, Thu 9-11am. OFFERS due WED 5/21 at NOON