Cal. Rev. & Tax. Code § 18041.5
(e) For purposes of this section:
(g) In accordance with subdivision (a), (b), (c), or (d), if the sale of an assisted housing development, real property, or condominium results in a gain during the taxable year, then all of the following shall apply:
(1) The statutory period for the assessment of any deficiency attributable to any part of the gain shall not expire before the expiration of four years from the date the Franchise Tax Board is notified (on the form as the Franchise Tax Board may provide) of one of the following:
(h) The Department of Housing and Community Development shall do all of the following:
(i) The group of purchasers who are lower income or very low income residents shall do all of the following:
(j) The seller of the assisted housing development, real property, or condominium shall do all of the following: