A sublease is an agreement where someone takes over part or all of an existing lease. This type of lease involves at least three parties.Subletting, also known as subleasing, involves renting out a property or a portion of it that you are currently leasing, to a new tenant. A tenant must get the landlord's approval before subleasing their apartment. This guide discusses what subleasing is, how to sublease your apartment, and where to advertise your apartment as a sublease and find a great tenant. 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. You must include the landlord or property manager, and most likely get written permission to go ahead with the lease takeover. Unless the lease says you can, a tenant may not sublet (rent the rental property to another person) unless their landlord says it's OK. Will rent checks be sent to you or the landlord? Unless the lease says you can, a tenant may not sublet (rent the rental property to another person) unless their landlord says it's OK.