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William R. Ahern

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William R. Ahern began his legal career at Allen Matkins in 1998. He is a partner in our Orange County office and head of the firm's Joint Venture and Tax Practice Groups. Bill's practice primarily focuses on real estate transactions, with a special emphasis on helping meet his clients' real estate needs in a tax-efficient manner. For close to 20 years, Bill has advised on purchase and sale transactions, financings, joint venture structures and restructures, tenancy-in-common arrangements, 1031 like-kind exchanges, fund formations and various tax issues encountered in connection with real estate transactions.

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.


  • 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