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") Definition of Subleasing.Subleasing occurs when a tenant rents out all or part of their leased space to another party, called the subtenant. BASIC SUBLEASE PROVISIONS. Parties. Subletting occurs when a tenant rents out their leased premisesor part of itto another person, referred to as the subtenant. Sublease agreements should always be in writing to avoid misunderstandings, and subtenants must adhere to the terms of the original lease. Most commercial leases allow the tenant to sublease provided they obtain the landlord's consent—consent that the landlord cannot unreasonably withhold. You should read your lease to see if it allows you to sublet the rental unit. Subletting means that you rent the unit to someone else. Subletting, also known as subleasing, is when a tenant (the original tenant) rents out their leased apartment or house to another person (the subtenant)