A Massachusetts sublease agreement is a document that legally allows the original tenant of a rented property to lease it to a new tenant. This section answers some common questions about subletting.Expand All Where can you sublet? Search short term and month to month rentals. However, most leases require landlord written consent before subleasing can occur, as noted in Massachusetts Legal Help guidelines. Create your Massachusetts sublease agreement to rent your unit. Use our free template to sublet to a new tenant. Looking to short term lease or sub-lease a 1 br 1 ba starting mid January. The Massachusetts sublease agreement allows for a tenant (the "sublessor") to rent out space that they currently have under lease to another individual. The subtenant agrees to assume all of the.