Cal. Gov. Code § 1091.1
The prohibition against an interest in contracts provided by this article or any other provision of law shall not be deemed to prohibit any public officer or member of any public board or commission from subdividing lands owned by him or in which he has an interest and which subdivision of lands is effected under the provisions of Division 2 (commencing with Section 66410) of Title 7 of the Government Code or any local ordinance concerning subdivisions; provided, that (a) said officer or member of such board or commission shall first fully disclose the nature of his interest in any such lands to the legislative body having jurisdiction over the subdivision thereof, and (b) said officer or member of such board or commission shall not cast his vote upon any matter or contract concerning said subdivision in any manner whatever.
Ca. Gov. Code § 1091.1