Welcome to 2504 Spring St, a rare Redwood City property featuring two units with separate entrances: a 3-bed, 2-bath main residence and a move-in-ready detached secondary unit. The main home greets you with a bright and spacious living room centered around a cozy fireplace. Beautifully remodeled kitchen includes new appliances and ample countertop space for those who love to cook. There are 3 bedrooms, and one with a private sliding glass door to the outdoors, alongside a hallway bathroom featuring soaring ceilings and a sun-pouring skylight. Everyday practicalities include an attached garage with overhead loft storage, plus a separate utility room with laundry hookups, extra storage, and potential for a future wet room conversion. Privately tucked behind is the charming detached unit, which features a functional sliding barn door separating the living room and bedroom, a fully equipped kitchen, and its own dedicated outdoor laundry area - offering total independence for extended family or guests. Outside, the expansive backyard offers a flexible haven for hosting dinner parties under the stars, setting up a play area, or gardening, complete with a sturdy shed for extra storage. Don't miss this rare opportunity to live, host, or invest in prime Redwood City!