Code of Civil Procedure § 12a does NOT extend time to exercise a lease option (Gans v. Smull (2003) 111 Cal.App.4th 985
The general “extension rule” of CCP 12a which does apply to 3 Day Notices, does NOT apply to exercise of lease options. In a commercial lease, the civil procedure rule extending period to perform any lawfully required act past holidays, including Saturday, to next...

