Mainsail Management Inc.


Founded by James Keliher, Mainsail Management Inc. is a Boston real estate investment and management firm with a history of surpassing expectations. You set the goals; we’ll exceed your targets.


Our first love is the Hub. For over three decades, we’ve been using our knowledge of the local market to unearth investment and management opportunities in the city’s most desirable neighborhoods.

Highlights of Mainsail’s work include:

  • Millions in investments, including the transformation of fashionable brownstones in the South End, Back Bay and Beacon Hill
  • High-end development of 150+ residential buildings
  • Luxury construction on thousands of square feet of residential and commercial property
  • Property management of 100+ units and numerous income properties in ownership



Our hallmark is flawless quality. Thanks to the experience and efforts of Mainsail’s veteran team, we’re known around town for our:

  • Meticulous attention to detail
  • Willingness to invest in top-end projects
  • Commitment to community

We’re proud of our record for creating long-term value – not only for investors, but for owners, residents and Boston itself.

Learn more about our neighborhood outreach efforts in our media section.

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