Yes, in California a contract to lease is legally binding once both the landlord and tenant agree to the key terms (such as rent, property, and lease duration) and sign the agreement. Leases longer than one year must be in writing to be enforceable under state law. Once signed, both parties are required to follow the lease terms unless it includes a lawful termination or cancellation clause.
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The information for this answer was found on our California Residential Lease Agreement answers.