Commercial tenants do not have the same protections under California law that residential tenants have. Since there are no laws governing commercial leases, the terms of the lease itself are what govern the tenancy and the relationship between the lessee and lessor.
However, there are certain sections of the Civil Code which can be applied to business leases. For instance, the landlord cannot unreasonably withhold approval for the tenant to sublet the premises. The landlord also cannot require payment of 'key money' as a condition of entering into a lease with a tenant.
Section 1954.25 of the Civil Code prohibits commercial rent control, on the basis that it discourages a competitive environment for business.