About The HYM Investment Group

The HYM Investment Group, LLC is a Boston based real estate company that focuses on the acquisition, development and management of complicated mixed-use urban projects with major residential, commercial and retail components. HYM and its principals have a long and successful track record in planning, permitting, financing, constructing and managing complicated mixed-use developments in both Boston and Cambridge. HYM’s success is directly related to the expertise and skill of its professionals and to HYM’s comprehensive neighborhood process, which engages all stakeholders including landowners, local businesses, municipal departments, state agencies and elected officials. HYM is currently leading the development of over nine (9) million square feet of mixed-use development in Greater Boston

For over 35 years, HYM’s principals have been working on real estate ventures in the Boston, New York and Washington, DC corridor. HYM has broad and strong working relationships with elected city officials, city staff, and neighborhood organizations in Boston, Cambridge and Somerville as well as the Massachusetts Bay Transportation Authority (MBTA), Massachusetts Department of Transportation (MassDOT) and other key agencies. HYM has a proven history of securing difficult to obtain permits and approvals from Boston, Cambridge and Somerville due to a thorough and inclusive public process with all stakeholders, as evidenced by the unanimous city approvals of both Bulfinch Crossing / the Redevelopment of the Government Center Garage (Boston) and NorthPoint (Cambridge).

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Product Types:

  • Urban Mixed-Use
  • Rental Apartments
  • For-Sale Condominiums
  • Commercial Office
  • Laboratory & Biotech
  • Retail
  • Hotel
  • Student Housing
  • Hospital, Academic and Institutional
  • Urban Public Parking Garages
  • Infrastructure

Development Capabilities:

  • Deal Origination and Structuring
  • Project Conceptualization, Planning, Programming
  • Permitting
  • Design Management
  • Equity Sourcing and Construction Loan Financing
  • Construction Management and Cost Control
  • Leasing and Marketing
  • Property Management
  • Tenant Fit-out
  • Accounting and Reporting


Representative Projects:

HYM has extensive experience developing projects with institutional investors including National Real Estate Advisors, New Balance, DivcoWest, Canyon Johnson Urban Funds, Atlas Capital Group,  The Drew Company, JP Morgan, Wells Fargo, Citizens Bank,  Prudential, GE Capital, and Britannia Pacific Properties / The Lewis Trust Group.

Leadership Team

The HYM team collectively has over 70 years of experience in all aspects of commercial and multi-family real estate and is currently developing, managing, and leasing over 9 million SF of mixed-use, commercial, multifamily and retail projects in Boston, Cambridge, and Somerville.

Thomas N. O'Brien

Founding Partner,

Managing director

Mr. O'Brien previously served as a Managing Partner for JPI, a national owner of multifamily communities, and as a Managing Director in Boston and New York for Tishman Speyer, one of the world’s leading real estate firms. O'Brien also led the Boston Redevelopment Authority as its Director and Chief of Staff, overseeing the development of over 12 million square feet of projects in Boston, from 1994 to 2000. O'Brien has served as Chairman of The Greater Boston Real Estate Board and currently serves on the Board of the Taubman Center for State and Local Government at Harvard University and as Vice Chair of the Board of Overseers of The Anti-Defamation League of New England. In 2011, the Governor of Massachusetts appointed Mr. O’Brien to the Board of the Massachusetts Housing Finance Agency. In 2016, Mayor Martin J. Walsh appointed O’Brien to the Board of Trustees of the Rose F. Kennedy Greenway Conservancy.  O’Brien is a graduate of Brown University and Suffolk University Law School, and is a member of the Massachusetts Bar.



Paul Crisalli, PE, LEED AP 


Director of Operations

Mr. Crisalli has over thirty-seven years of real estate development and operations experience in commercial and multifamily properties. Mr. Crisalli previously served as Operations Partner and Senior Vice President for JPI where he was directly responsible for all development and investments in the New York Region and oversaw the design and development of multifamily projects in JPI's Northeast Region. Prior to JPI he served as Managing Director of the Halpern Real Estate Development Company and previous to that as Director of Construction and Development of the Halpern Building Corporation. He is a member of the National Society of Professional Engineers and a member of the US Green Building Council. Mr. Crisalli has also served as Chair, and former Executive Board Member, of the Westchester/Fairfield District Council of the Urban Land Institute. Mr. Crisalli is a graduate of Polytechnic Institute of Brooklyn and is a Professional Engineer.



Douglas J. Manz


Director of Development

Mr. Manz previously served as a Development Partner for JPI and Vice President of Development for Northland Investment Corporation where he focused on the permitting and development of high-rise, mid-rise and low-rise multifamily projects. Prior to that, he held various positions with Leggat McCall Properties in Boston. In 2013, Mr. Manz was appointed to and served on the City of Cambridge Transportation Advisory Committee and is a member of ULI and NAIOP. Mr. Manz is a graduate of Cornell University and the Harvard University School of Design.