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") A commercial sublease is an agreement to lease space from a tenant rather than directly from a property owner.You don't have to write up a sublease contract. I do have a written contract with the subleasers. It's a 2 month contract saying that they must pay monthly with a specific move out date. A standard sublease agreement is a common legal agreement that allows a renter of a property to sub rent to a new tenant who will be taking the renter's place. 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 rental agreement in California is a legally binding contract that establishes the terms and conditions between a landlord and a tenant. A sublet, or sublease agreement, adds someone new to an existing lease.