Cal. Rev. & Tax. Code § 201.1
Property owned by a nonprofit entity, in which a transit development board has the sole ownership interest in the entity, shall be deemed to be property owned by the transit development board for purposes of this division. To the extent that the property is possessed, or a claim to or right to possession of the property exists, for other than public purposes, the interest shall be deemed a possessory interest as defined in Section 107.
It is the intent and purpose of this section to clarify Section 3 of Article XIII of the California Constitution and, therefore, this section does not constitute a change in, but is declaratory of, the existing law. Furthermore, this section shall not be construed to exempt, from ad valorem property taxation, property of any transit development board located outside of its boundaries.
Ca. Rev. and Tax. Code § 201.1