California Code, Revenue and Taxation Code - RTC § 24357.2

(a) In the case of a contribution (not made by a transfer in trust) of an interest in property which consists of less than the taxpayer's entire interest in such property, a deduction shall be allowed under Section 24357 only to the extent that the value of the interest contributed would be allowable as a deduction under Section 24357 if such interest had been transferred in trust. For purposes of this subdivision, a contribution by a taxpayer of the right to use property shall be treated as a contribution of less than the taxpayer's entire interest in such property.

(b) Subdivision (a) shall not apply to a contribution of--

(c) The amendments made to this section by the 1977-78 Legislature shall apply with respect to contributions of transfers made after December 31, 1976, and before June 14, 1977.

(d) The amendments made to this section by the 1981-82 Regular Session of the Legislature shall apply with respect to contributions or transfers made in taxable years beginning on and after January 1, 1982.