The California sublease agreement is a legal document that binds the current tenant of a rental property (the "sublessor") to a new tenant (the "sublessee") Hello, I have a question for the sublease.I am foreign and not very familiar with the rental situation here. You can negotiate for a sublet and assignment clause or contraction rights to give your business flexibility in its commercial lease. This Sublease agreement (herein "Sublease") is made and entered into on. California Tenants – A Guide to Residential Tenants' and Landlords' Rights and. A sublease agreement is a legal document allowing existing tenants to rent out their rented space to another party, the subtenant. A sublet, or sublease agreement, adds someone new to an existing lease. Usually the new person (subletter) replaces someone who is moving out. This holds true, even if the customer picks up the property in Santa Clara County for use in Alameda County.