Welcome to this lovely light-filled condominium with 850 square foot across an open floor plan. The modern living area features warm wood floors and defined south-facing windows. The living room includes space for a dining area with track lighting. A breakfast bar with pendant lighting connects the living area to the kitchen. The kitchen features granite counters and a handsome slate backsplash as well as tile flooring. The spacious bedroom has room for a desk or private reading nook. A walk-in closet and expansive bathroom, plus convenient in-unit laundry completes this fabulous offering.Nestled between K and H Streets, it's easy to see why neighbors love calling the magnificent 400 Mass home. Packed with amenities, residents enjoy a spacious community room, billiards room, fitness center, business center, 24-hour concierge, security, and more. The fabulous rooftop terrace with gas grills, swimming pool, and sweeping views of the city will be a favorite spot to unwind. Everything you need is at your doorstep with endless dining, retail, and entertainment options nearby. Commuting around or out of the city will be a breeze with Metrobus outside, I-395 one block away, and Gallery Place, Judiciary Square and Mt. Vernon Square Metros all only three blocks away. 1 garage parking space conveys.