Welcome to Maison Commonwealth, a premier new construction boutique concierge residence where European elegance and modern sophistication meet the historic charm of Boston’s Back Bay. This exceptional 2-bedroom, 2.5-bath Parlor Duplex townhome offers over 1,820 sq. ft. of refined living with soaring nearly 12-ft ceilings, intricate hand-cast plaster moldings, imported hand-carved Italian marble fireplaces, and wide-plank oak floors. The Parlor level showcases gracious entertaining spaces overlooking tree-lined Commonwealth Avenue, along with a beautifully appointed bedroom suite offering direct access to a private terrace. Privately situated on its own dedicated level, the luxurious primary bedroom suite creates a serene retreat with direct garden entry and access to a private brick-walled bluestone patio. The spa-inspired bath features floor-to-ceiling marble, a double vanity, soaking tub, separate shower, and radiant heated floors. A sleek Italian kitchen with custom cabinetry, Wolf and Sub-Zero appliances, wine refrigerator, and built-in coffee maker complements the sophisticated interiors. Concierge service 7am-11pm, direct access to one heated garage parking space, and private storage complete this rare offering in an intimate, professionally managed five-residence boutique building.