By Eric Coffill, Robert Merten III and Nicholas Kump (July 7, 2017, 12:03 PM EDT) -- Rarely does a subject as mundane as a documentary transfer tax become worthy of its own article. However, the June 29, 2017, decision of the California Supreme Court in 926 North Ardmore Avenue LLC v. County of Los Angeles (Ardmore)[1] is a worthy exception. Affirming the Court of Appeal, the California Supreme Court held in Ardmore that California's documentary transfer tax may be imposed by localities on transfers of interests in legal entities holding title to real property when three criteria are met: (1) the legal entity interest transfer is memorialized in writing; (2) the transfer is made for consideration; and (3) the transfer constitutes a "change of ownership" in the legal entity within the meaning of "change of ownership" for property tax reassessment purposes as set forth in Cal. Rev. & Tax. Code[2] § 64, subds. (c) or (d).[3] Under the Ardmore holding, it is irrelevant whether the written instrument at issue memorializing the legal entity interest transfer is recorded or directly references the real property.[4] Moving forward, every transaction involving a transfer of an interest in a legal entity holding title to real property in California is going to require thorough investigation and due diligence concerning the possible triggering of Ardmore documentary transfer tax imposition....