William R. Ahern


William R. Ahern began his legal career at Allen Matkins in 1998. He is a partner in our Orange County office, where he practices in our firm's Business and Tax Planning Practice Group.

Bill's practice primarily focuses on the structuring, formation, syndication and taxation of partnerships and limited liability companies that are formed to engage in complex real estate transactions. Such entities range from single-purpose entities formed to acquire a single asset to programmatic ventures, as well as syndicated funds formed to invest in real estate-related assets. Bill also has extensive experience in the structuring and documentation of Section 1031 like-kind exchanges, tenancy-in-common agreements and other property related transactions. Bill's clients range from developers, sponsors, private real estate investors and pension fund advisors to privately held and publicly traded businesses and financial institutions. The other portion of Bill's practice focuses on estate planning. Bill has represented numerous high-net worth clients in connection with the preparation of their estate plans. Through the use of revocable and irrevocable trusts, insurance trusts, split-dollar arrangements, family limited partnerships, and self-canceling installment notes, Bill has helped his clients meet their estate planning needs in a tax-efficient manner.


  • Urban Land Institute-Orange County District Council: Executive Committee Member (2006-2009), Membership Committee, Co-Chair (2006 to 2009)
  • Orange County ULI Capital Markets Committee, Council Member (2009-2010)
  • Ohio State Alumni Club of Southern California (1998-present)
  • American Bar Association
  • California Bar Association


Bill received his B.A. in economics from Ohio State University. He attended law school at the University of Toledo College of Law on full scholarship and graduated as valedictorian of his class in 1997. While at the University of Toledo, Bill served as an editor of the University of Toledo Law Review. Thereafter, he attended New York University School of Law on a Tax Law Review Scholarship and served as a graduate editor of the Tax Law Review. Bill received his LL.M. in Taxation from New York University in 1998.

Bar Admissions

  • California