Cal. CIV § 1997.020

As used in this chapter: (a) “Landlord” includes a tenant who is a sublandlord under a sublease. (b) “Lease” means a lease or sublease of real property for other than residential purposes, and includes modifications and other agreements affecting a lease. (c) “Restriction on use” means a provision in a lease that restricts the use of leased property by a tenant, whether by limiting use to a specified purpose, mandating use for a specified purpose, prohibiting use for a specified purpose, limiting or prohibiting a change in use, or otherwise. (d) “Tenant” includes a subtenant or assignee.