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Mark D. Olson



Mark D. Olson divides his practice between federal and Delaware tax matters, and planning involving the use of Delaware trusts.  His clients include individuals, closely held businesses, financial institutions, and real estate owners, investors and developers.


  • Advising trustees of Delaware Statutory Trusts in connection with judicial resolution proceedings
  • Advising real estate owners and investors in structuring complex like kind exchanges, including reverse exchanges and build-to-suit and parking transactions
  • Counseling financial institutions and other clients in connection with modification of existing trusts through changes of situs, decanting, non-judicial settlement agreements and grantor consent agreements
  • Advising closely held business owners in implementing S corporation elections with Qualified Subchapter S Trusts and Electing Small Business Trusts as stockholders
  • Successfully defending estate tax, gift tax and income tax return examinations
  • Working with closely held business owners to develop and implement succession plans
  • Implementing successful strategies for tax-advantaged intra-family transfers of real property and closely held business interests

Professional Affiliations

Delaware State Bar Association

  • Tax Section, Member, Past Chair
  • Trusts and Estates Section

American Bar Association

  • Section of Taxation
  • Real Property, Trust and Estate Law Section

News & Events



Estate Planning Council of Delaware
Wilmington Tax Group
Meeting Ground, Inc., Board of Directors, 2009 – 2012
More Light Presbyterians, Board of Directors, 2015 – Present
New Castle Presbytery of the Presbyterian Church (U.S.A.)

  • Chair of Presbytery Council, 2015 and 2017
  • Vice Moderator, Moderator, 2013 - 2014
  • Trustees, 1999 - 2005, 2009 - 2012



Best Lawyers®, 2011-2018

Best Lawyers®, 2016 and 2018 "Lawyer of the Year" for Tax Law

Martindale-Hubbell®, AV Rating

T 302.888.5211
F 302.571.1750


Delaware, 1976

U.S. Tax Court

U.S. Supreme Court


University of Pennsylvania Law School, J.D., 1976

State University of New York at Binghamton, B.A., 1973

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