This document outlines the terms under which the sublessee will rent the property from the sublessor, defining the dynamics of this unique legal relationship. The procedure for subleasing is quite complicated.A sublease agreement is a legal document that allows a tenant to rerent their property to someone else (subtenant). The first step in writing a sublease agreement is to describe the property and identify the address. Sublease: An agreement in which tenant leases property from another tenant (or "sublandlord") instead of from the landlord directly.