A California sublease agreement is a document between a current tenant (sublessor) and a subtenant for residential use. A California sublease agreement is a written arrangement that involves a residential tenant leasing their rental property to a subtenant.Our free sublease agreement template makes it easier to sublet your room or apartment. Edit and store it on Contractbook to keep track of dates and obligations. Set out fair and legally binding terms as you lease your Ontario premises. Cover crucial aspects with our Sublease Agreement Sample Ontario template. Create your California sublease agreement here. Rent your unit to a subtenant and download our free template. This Sublease Agreement is available for use on UpCounsel. A sublease agreement is a legal contract signed between a tenant and a third party allowing the latter to rent out the entire property or any part of it.