A California sublease agreement is a written arrangement that involves a residential tenant leasing their rental property to a subtenant. Tomonth agreement is a 30day contract.Each time you pay rent, you renew the contract for another 30 days. BASIC SUBLEASE PROVISIONS. Parties. A California sublease agreement is a document between a current tenant (sublessor) and a subtenant for residential use. California law requires tenants to seek explicit, written permission from their landlords to sublet if it is not already allowed in the lease. There are a variety of reasons why your tenant may ask to sublease in Los Angeles. Learn how to manage it in our latest post! Create your California sublease agreement here. Rent your unit to a subtenant and download our free template.