Enviably situated on a quiet residential block in the Lower Haight section of Hayes Valley, 149-153 Buchanan Street is a grand Edwardian triplex offering three vacant, expansive full-floor flats in a classic 1911 building. With approximately 5,427 +/- square feet of living space, this property delivers scale, light, and architectural integrity rarely found in a fully vacant multi-unit offering. Enter through a gated entry with decorative ironwork opening to a grand terrazzo stairway framed by marble-clad walls and mosaic tile accents. Each residence occupies an entire floor and features soaring 10-foot ceilings, dramatic curved bay windows, refurbished hardwood floors, and formal living and dining rooms, each with a fireplace, along with a rich collection of Edwardian details such as coved ceilings, period millwork, pocket doors and wainscoting, showcasing the building's character. The middle flat has been updated to exacting standards and serves as the model residence, featuring a fully renovated designer kitchen with marble countertops, custom cabinetry blended with refurbished vintage cabinets, open shelving, white subway tile backsplash, Fisher & Paykel refrigerator, Miele dishwasher, and a vintage black O'Keefe & Merritt range with stainless hood. The flat layouts include a lower flat with two bedrooms plus den and split bath (1,492 SF), a middle flat with three bedrooms and split bath (1,680 SF), and an upper flat with three bedrooms and split bath (1,792 SF). Recent updates include refinished hardwood floors, newly carpeted stairways, updated lighting & electrical systems, and new custom paint throughout. The property also features a garden-level bonus apartment with eat-in kitchen with new luxury vinyl plank flooring, open floorplan living/bedroom, full bathroom, and direct access to a peaceful landscaped rear garden with mature ferns and stone patio. A expansive garage with side-hinged carriage-style doors offers one-two car parking, abundant storage, and potential for three-car parking with reconfiguration. Each residence also features in-unit laundry. Walking distance from Hayes Valley shops and dining, Lower Haight neighborhood favorites, Alamo Square, Duboce Park, and Golden Gate Park. With convenient access to public transportation, Highway 101, and the Bay Bridge, this is a rare opportunity to acquire a fully vacant Edwardian triplex in a prime San Francisco location, ideal for an owner-user, TIC conversion, or long-term investment.