Practice Focus

Dan Ossoff is chair of Rackemann’s real estate practice. He is an experienced transactional lawyer handling all aspects of commercial real estate ownership, development and finance, with an emphasis on land acquisition and disposition, leasing, and title matters. Dan’s clients include national corporations, non-profit institutions, private developers and individual property owners.


Dan has been with Rackemann Sawyer & Brewster since entering the practice of law in 1983.

Honors and Awards

  • Selected as 2017 “Lawyer of the Year” for Real Estate Law in Boston by Best Lawyers
  • Listed in The Best Lawyers in America, 2006-2020
  • Recognized as a Massachusetts Super Lawyer, 2004-2021
  • Elected as a Fellow of the American College of Real Estate Lawyers, 2004
  • AV Preeminent® Rating (5.0 out of 5.0) by Martindale-Hubbell, its peer rating for highest level professional excellence and high ethical standing
Notable Experience

Notable Experience

Dan’s active practice currently includes the representation of the following clients:

  • A large regional owner of apartment building complexes in connection with the development, financing, acquisition, and disposition of multi-family residential properties, including projects with an affordable component developed pursuant to Chapter 40B of the Massachusetts General Laws
  • A major Massachusetts-based defense contractor, as outside counsel in the acquisition and disposition of real estate holdings
  • A national telecommunications company, acting as outside counsel in the leasing, acquisition and sale of real estate throughout New England, and licensing of tower facilities in the northeastern United States
  • A local university, providing ongoing representation and advice in connection with its real estate holdings

Among Dan’s past projects are the following:

  • Development of an air rights condominium involving a local university and private development entities
  • Expansion of a waterfront convention facility involving the development of hotel, garage and office components on ground leased parcels
  • Development of a new world-wide headquarters facility on a ground leased parcel of land for a major U.S. company
  • Modifications to and enlargement of an electronics research and development facility pursuant to a long-term lease arrangement within a condominium ownership structure
  • Transfer of several railroad lines spanning the eastern and western portions of Massachusetts
  • Sale of a downtown office tower via a transfer of air rights and creation of a reciprocal easement and restriction arrangement
  • Representation of anchor tenant in lease of office space in new downtown tower
Professional Activities

Professional Activities

  • The Real Estate Bar Association for Massachusetts (formerly known as the Massachusetts Conveyancers Association), member, 1983-present
    • Board of Directors, 2000 – 2010 and 2014 – 2017
    • Co-Chair of Amicus Committee, 2014 – present
    • Vice-Chair of Practice of Law by Non-Lawyers Committee, 2007 – 2008
    • Chair of Nominating Committee, 2006
    • Immediate Past President, 2006
    • President, 2005
    • President-Elect, 2004
    • Treasurer, 2003
    • Chair of Legislation Committee, 2001 – 2003
  • American College of Real Estate Lawyers, fellow, 2004 – present


  • Abstract Club, member, 1999 – present
    • Executive Committee Member, 2014 – present
  • Massachusetts Continuing Legal Education, Inc. – Real Estate & Environmental Law Advisory Committee, member, 2006 – present
  • Boston Bar Association, member, 1991 – present
  • Massachusetts Bar Association, member, 1984 – present


  • Editor: Drafting Commercial Real Estate Documents in Massachusetts, MCLE, Inc. (2004, 2009, 2012, 2015)
  • Author: “Annotated Due Diligence Checklist for a Commercial Real Estate Transaction,” The Best of MCLE Journal, Vol. 8, No. 2 (February, 1997)
  • Author: “The Title Abstract,” The Best of MCLE Journal, Vol. 4, No. 4 (August, 1993)
  • Author: “Other Sources of Title Information,” The Best of MCLE Journal, Vol. 2, No. 3 (May, 1991)
  • Lecturer: Massachusetts Continuing Legal Education, Inc.:
    • Handling Commercial Sales: From Offer to Closing (June, 2018; May, 2019)
    • Negotiating and Drafting Commercial Real Estate Agreements (December, 2004; January, 2006; January, 2007; January, 2008; and January, 2009)
    • Commercial Real Estate Conference – Legislative Update (March, 2004)
    • Commercial Real Estate Closings (June, 2000 and March, 2001)
    • Handling Real Estate Title Issues (December, 1997 and October, 1998)
    • Negotiating and Drafting Commercial Real Estate Leases (May, 1998)
    • Real Estate Title Abstracts, Problems and Insurance (October, 1990; December, 1991; November, 1992; December, 1993; December, 1994; November, 1995; and November, 1996)
    • Commercial Real Estate Basics (October, 1994 and October, 1995)
    • Drafting Real Estate Documents Series – Acquisition Documents (January, 1994)
  • Speaker: REBA, The Real Estate Bar Association for Massachusetts:
    • Presidential Addresses (2005)
    • Legislative Updates at Semi-Annual Meetings of the Association (2001 – 2003)
    • Chair of Spring, 2001 Seminar – “2001, A Commercial Space Odyssey” (May, 2001)