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The One and Only
21 Allen Street
Design-Forward Living in Somerville
69 energy-efficient residences with timeless interiors, modern amenities, and walkable access to Harvard, MIT, and Union Square.
Smart. Sustainable. Connected.
Now pre-selling.
See the latest progress at 21 Allen Street as we bring Boston’s newest energy-efficient residences to life. From foundation to finish, Helios Properties delivers quality.
A New Standard for Urban Living
Nestled between vibrant Somerville and Cambridge, 21 Allen Street offers a rare chance to live at the crossroads of two of Boston’s most dynamic communities. Set in the character-filled Allen Street neighborhood, this new development blends culture, creativity, and modern urban living.
Now pre-selling.
Explore Life Around 21 Allen Street
Located at the crossroads of Somerville and Cambridge, 21 Allen Street places you steps from world-class universities, innovation campuses, and lively neighborhood culture. Walk to Union Square, shop local, or connect effortlessly via Green Line and I-93 access.
Mini Highlights:
3-Minute Walk to Union Square Green Line Station
8-Minute Drive to Harvard & MIT
Surrounded by Top Biotech, Tech, and Academic Institutions
A New Standard for Urban Living
Discover 69 thoughtfully designed residences at 21 Allen Street, offering studio, one-bedroom, and two-bedroom layouts with timeless interiors, energy-efficient systems, and sophisticated finishes—all just steps from Harvard, MIT, and Kendall Square.
Key Features:
- PHIUS+ certified, net-zero-ready construction
- Expansive windows with natural light and city views
- Designer kitchens with stone countertops and custom cabinetry
- Spa-inspired bathrooms with premium fixtures
- Smart layouts and neutral palettes for modern city living
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