A California sublease agreement is a written arrangement that involves a residential tenant leasing their rental property to a subtenant. Subletting your office space or commercial property?Easily customize your own Commercial Sublease Agreement. A California sublease agreement is a document between a current tenant (sublessor) and a subtenant for residential use. Our easy to use tool can help you create a commercial sublease in less than 2 minutes. Sublet a room or add a roommate. A Sublease Agreement is a rental contract between an original tenant and a subtenant. A sublease agreement is a legal document allowing existing tenants to rent out their rented space to another party, the subtenant. Filling out this Commercial Sublease Agreement requires attention to detail and properly addressing all parties involved. Use this free Commercial Sublease Agreement Template when a tenant wishes to sublet their leased commercial space to a third party.