California Code, Civil Code - CIV § 1995.020

(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 transfer” means a provision in a lease that restricts the right of transfer of the tenant's interest in the lease.

(d) “Tenant” includes a subtenant or assignee.

(e) “Transfer” of a tenant's interest in a lease means an assignment, sublease, or other voluntary or involuntary transfer or encumbrance of all or part of a tenant's interest in the lease.