Cal. Rev. & Tax. Code § 25141
(a) For purposes of this section, the following definitions shall apply:
(3) “Professional athletic team” means any entity which has all of the following characteristics:
(c) The business income of a professional athletic team derived directly or indirectly from its operations as a professional athletic team shall be allocated to this state pursuant to the following three-factor formula:
(1) Computation of the property factor under Section 25129:
(2) Computation of the payroll factor under Section 25132:
(3) Computation of the sales factor under Section 25134:
(d) If any team that has its operations based in this state is required to allocate or apportion a part of its business income derived directly or indirectly from its operations as a professional athletic team to another state or country by the laws, regulations, or requirements of the other state or country and pays an income or franchise tax measured by income thereon as a result of the allocation or apportionment, then all of the following shall apply: