Cal. Code Regs. tit. 2, § 1803 – Changes in Application After Original Approval.

(a) An applicant for an apportionment may, after approval of an application, request approval by the Board of changes within any project applied for, including a change in the location of a site. Such changes may be approved by the Board provided:
1. (1) That the changes are deemed necessary by the Board to properly achieve the essential purposes of the application as originally approved.
2. (2) That, except for changes made under the provisions of Section 1814 hereof, the changes do not increase the total building area of the project application as originally approved by the Board.
(b) Any approval by the Board of such changes shall be deemed to relate back to the date of the original approval and shall have the same effect as if made at the time of such original approval.