CA Civ Code Section 1995.250

A restriction on transfer of a tenant’s interest in a lease may require the landlord’s consent for transfer subject to any express standard or condition for giving or withholding consent, including, but not limited to, either of the following:

(a)

The landlord’s consent may not be unreasonably withheld.

(b)

The landlord’s consent may be withheld subject to express standards or conditions.