A commercial sublease is a type of agreement where a tenant rents out their leased commercial space to another business. Ensure that the sublease includes a written consent form from the landlord regarding the sublease.Dealing with Difficult Property to Sublease. How to fill out the Commercial Sublease Agreement Form Instructions? 1. Identify and enter the details of the Landlord, Tenant, and Subtenant. 2. Sublease Clause: This clause determines whether you can sublease the space to another tenant. A California lease agreement allows a landlord of residential or commercial property to write a legally binding rental contract with a tenant. Subletting your office space or commercial property? Easily customize your own Commercial Sublease Agreement. What is included in a standard Commercial Sublease Agreement?