Uncompromised City Living.... A 1923 Observatory Circle Masterpiece on Nearly a Quarter-Acre.....Perfectly blending classic architecture with inspired modern design, this 4,740-square-foot residence at 3811 Fulton St NW has been meticulously transformed from the inside out. Set on an exceptionally rare 0.22-acre lot in the heart of the city, this home delivers the scale, privacy, and modern conveniences today's buyers demand. Natural light floods the open-concept main level through expansive black-framed windows, highlighting soaring ceilings, a dramatic floating staircase, and wide-plank white oak flooring. At the center is a chef’s kitchen featuring custom cabinetry, premium appliances, waterfall quartz surfaces, an oversized island, and an integrated beverage station. Walls of glass wrap the dining area, while the living room anchored by a contemporary fireplace flows seamlessly onto a covered side porch and a deeply private, level backyard. Upstairs, the primary suite offers a serene retreat with generous walk-in closets and a spa-inspired bath, accompanied by three additional bedrooms outfitted with custom wardrobe systems. Ascend the striking floating staircase to the home's crown jewel: a light-filled top-floor loft with a full bath opening directly onto an expansive rooftop terrace with sweeping treetop views. Complete with a finished lower-level recreation room, a private fifth bedroom, and a detached two-car garage equipped with an EV charging station, this is a turnkey urban sanctuary just minutes from Stoddert Elementary, Glover Archbold Park, and Georgetown.