Project Progress: Construction Complete

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About Alloy at Assembly Row

375 Canal Street, Assembly Row, Somerville, MA

13-story mixed-use building featuring 122 condominium residences on levels six through 13, a 159-key Marriott Autograph Collection boutique hotel, The Row Hotel, on levels two through five and approximately 21,000 square feet of first-floor restaurant and retail space. Residences at Alloy range from studios to three-bedrooms; the building's 107 luxury residences are sold out. 15 residences at Alloy are designated affordable and will be offered through a lottery in the coming months.

Common amenities for Alloy residents and hotel guests will include a swimming pool, a fitness center, and concierge service. Residents will have access to a roof deck, Baroo pet concierge service, and a clubroom with a lounge, an entertaining kitchen, a quiet study, and a conference room. A 103-space underground parking garage will be located underneath the building. Alloy will open in the first quarter of 2018.

Renderings of Alloy:

Alloy Renderings

Square Feet ITK



Affordable Housing



Stories Free
Height (feet) ITK
Start Date ITK
Topping Off Date ITK
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Latest Updates

May 02, 2019

Federal Realty Investment Trust Increases Sustainability Efforts with Beekeeping Partnership


Aug 09, 2018

New Hampshire-based, XSS Hotels has acquired the hotel portion of Alloy at Assembly Row for...


Dec 03, 2017

First luxury condominiums at Somerville’s Assembly Row sell out pre-completion


Jul 11, 2017

Alloy at Assembly Row condos over 90% sold, exterior finish installation underway


Mar 22, 2017

Facade installation underway at Alloy at Assembly Row, luxury residences now on sale


Jan 31, 2017

Alloy at Assembly Row tops off, residences now on sale


Oct 16, 2016

Alloy at Assembly Row nears topping off, new video released


Sep 11, 2016

Alloy at Assembly Row condos 45% pre-sold after under eight weeks of pre-sales


Latest Press Releases

Event marks notable milestone in the steady evolution of Somerville’s newest mixed-use community

Somerville, MA (Nov. 14, 2016) – Callahan Construction Managers, a Bridgewater based full-service construction management firm, along with developer Federal Realty Investment Trust, architect Stantec and Iron Workers Local 7 commemorated a significant milestone in the ongoing progress of Assembly Row with the topping off of Block 6. It was an exciting day where executives and other project partners gathered to sign the final steel beam before it was lifted and connected to the top floor of the new mixed-use property.


“We are honored to play a role in the advancement of one of the region’s most exciting new neighborhoods in collaboration with such valued partners,” said Patrick Callahan, President of Callahan Construction Managers. “Following the topping off of Block 6, we look forward to guiding continued successful construction progress at this dynamic property.”


Assembly Row, developed by Federal Realty Investment Trust, is a vibrant mixed-use community in Somerville’s Assembly Square neighborhood. Upon completion, the transit-oriented development will include more than 600,000 sq. ft. of retail, 1,800 residential units and 2.8 million sq. ft. of office space.


The Block 6 component of Assembly Row includes two buildings comprised of a 20-story 273-unit girder slab tower, a six-story 174-unit wood frame structure, which includes 40,000 sq. ft. of ground floor retail space and a seven-story 650-car parking garage. The property is anticipated to be complete in early 2018.


About Callahan: Callahan is a full service construction management company that has served the New England and Northeast regions for more than 65 years. As one of the region’s oldest family-run construction management firms and one of the largest open shop construction firms in the Northeast, Callahan provides a wide range of preconstruction and construction management services to local, regional, and national clients. Callahan enforces a high quality and innovative approach to all projects, including multi-family residential, senior housing, hospitality, retail, corporate office, life sciences, educational, and other markets. Visit for more information.

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