Clients We mitigate and manage our customer’s risk from inception to completion.

Abbott Real Estate Development

Accent Therapeutics

Alchemab Therapeutics




AW Perry


Barretts Ale House

Beacon Communities

Benchmark Senior Living

Benderson Development Company

Boston Properties

Boston Scientific

Boston University

Boylston Properties


Brandeis University

CA Ventures

Cabot, Cabot & Forbes

Cambridge College

Canpro Investments, LLC

Cape Cod Healthcare

Capital Hall Partners

Capstone Development Partners, LLC



CEA Group

Choice Hotels

Claremont Companies

Comfort Inn

Concord Hospitality Enterprises

Corcoran Companies


Cross Harbor Capital Partners


Equity Office

Equity Residential

Falmouth Youth Hockey League Inc.

Federal Realty Investment Trust

Finard Properties

Forest City Residential Group

Forest Properties

Global Property Development Corporation

GND Realty Trust

Greatland Realty Partners


Group One Partners

Hampton Inn / Homewood Suites



Housing Assistance

Housing Improvements Co.


Jefferson Apartment Group

John Flatley Company

Just-A-Start Corporation

Kensington Investment Company, Inc.

KW Development, LLC

LCB Senior Living

Leggat McCall Properties

Liberty Mutual Insurance

Lincoln Property Company

Lixi Hospitality Group

LMC, A Lennar Company

Longfellow Properties

Lowe's Companies, Inc.

Marcus Partners

Market Basket

Massachusetts Institute of Technology


National Development

New England Development


Northbridge Companies

Park Lodge Hotel Group


Pleasant Street, LLC

Preservation of Affordable Housing

Priderock Capital Management


Regency Centers

RJ Development & Advisors


Rose Associates

Sam Park & Company

Samuels & Associates

SLV River Street, LLC

South Shore YMCA

Stratford Capital Group

Sundance at Harvard Square Holdings


The HYM Investment Group, LLC

The Mayo Group

Toll Brothers

Town of Hanover

Town of North Andover

Trammel Crow Company

Trammell Crow Residential


United Group

Universal Properties

Urban Spaces


VinCo Properties

Volnay Capital

Wang Labs Inc.

Washington Square Ventures


Winn Development

Winter Street Trust

Wood Partners

Woods Hole Golf Club

WS Development

“The Callahan team has consistently demonstrated a high level of professionalism, effective communication, and a great deal of pride in their work. Callahan’s commitment to providing exceptional service from preconstruction through completion was a key factor to the success of this project”

– Andrew Mahar, Founder & Managing Director, Anchor Line Partners

“The Callahan team demonstrated the highest level of professionalism from start to finish on our Lab renovations. The team was able to adapt quickly to the challenges of working within an occupied, sensitive environment.”

– Andrew Rovan, Senior Project Manager, Brandeis University

“Our experience with Callahan has been at the very top of the list. We have enjoyed open and effective communication and value engineering, quick responses, and transparent pricing. It was a pleasure working with Callahan on another successful project.”

– Sean D. Sacks, Director, Hines

“Callahan’s performance exceeded our expectations. The effectiveness and professionalism required Callahan to achieve success on this project well before construction started, with responsive, intelligent preconstruction services. A primary key to the success of the project was the integrity of Callahan’s team, from the executive level leadership to the final quality control personnel.”

– Patrick McMahon, VP, Development, Federal Realty

Let's build something together

Callahan is committed to building strong, long-lasting client relationships, and to consistently delivering solutions that exceed expectations. Contact us today about starting your next project.