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John Sadowski | Colliers | Boston

John Sadowski

Senior Vice President

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Professional Summary

As a senior leader in the Development and Consulting Services Group, it is my role to provide unparalleled service to a broad range of clients. Such areas of service include the planning and management of base building, ground-up and interior projects in the academic, residential, commercial/corporate, healthcare and life science sectors. In conjunction with these specialty services, I also advise and represent developers, owners and tenants in a consultative capacity.

Prior to joining Colliers, I spent twenty years at Leggat McCall Properties, serving in a partnership and ownership role. Years of service in the field has afforded me an incredible amount of experience in all facets of the commercial real estate industry as well as invaluable personal experience with a great majority of brokers in the Boston area. Often working alongside brokers, my engineering background brings an important, more technical perspective to a transaction, allowing me to be effective in early stage development and lease negotiations.

I pride myself in executing projects in a concise and detailed manner, maintaining a deep understanding of the big picture and an ever-important sense of humor. I strive to go above and beyond clients’ expectations to ensure repeat business, which has proven effective as clients often return to me when they begin exploring lease renewals and/or relocations. An overwhelmingly positive outlook for the Boston market keeps me engaged and interested as I continue to pursue my craft while also serving as a mentor to several of my colleagues.




  • Christian Science Mother Church 6 year/7 phase major historic restoration
  • The Foundry*, Providence, RI, 196 unit residential development & garage
  • MITIMCo* multi-building renovations
  • UConn, new Innovation Partnership

Engineering & Science Buildings

  • NE Conservatory*, Jordan Hall historic/4-building façade restoration
  • Brandeis University*, 5-story Shapiro Science Complex, 220-bed residence hall and Business School buildings

Corporate/Tenant Improvement

  • Law Firms/HQ’s; Mintz*, WilmerHale, Bingham*, Choate & Foley Hoag
  • Boston Stock Exchange, 100 post trading floor/office
  • Fleet/Bank Boston* HQ’s, Items Processing consolidations, retail

Development Management

  • John Hancock, 625KSF 27-story Back Bay Boston office tower
  • O’Neil Properties Group/Prudential, Watertown Arsenal 360KSF historic office redevelopment
  • Hexalon Real Estate, 916KSF 34-story State Street Bank Building redevelopment

Health Care/Hospital

  • McLean Hospital building addition
  • Steward Health Care*, 9 hospital renovations/Dana Farber oncology
  • Partners/MGH*, administrative offices


  • UConn, Brandeis labs (see Academic)
  • Novartis prototype research lab
  • Brigham and Women’s/ Kowa lab
  • Massachusetts General Hospital (MGH)*, 355KSF Simches Lab Building
  • Schepens Eye Research Institute Lab

* multi-project repeat client


Cornell University, Bachelor of Science, Civil and Environmental Engineering (concentration in Structural Engineering)


Service Lines

Project Management

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