Cal. Gov. Code § 65590.1

Any local government which receives an application as provided in Section 30600.1 of the Public Resources Code to apply the requirements of Section 65590 to a proposed development shall apply these requirements within 90 days from the date on which it has received that application and accepted it as complete. In the event that the local government has granted final discretionary approval to the proposed development, or has determined that no such approval was required, prior to receiving the application, it shall, nonetheless, apply the requirements and is hereby authorized to conduct proceedings as may be necessary or convenient for the sole purpose of doing so.