Subletting, also known as subleasing, involves renting out a property or a portion of it that you are currently leasing, to a new tenant. How Much Does a Sublease Cost?The average cost (i.e. Subletting is a real estate arrangement where a tenant leases their rental property or part of it to another individual, known as a subtenant. Find sublease lawyers for Phoenix, AZ to hire. No cost to post a project to get multiple bids in hours to compare before hiring. 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. Dig up your leasing contract and make sure it allows for subtenants. Here's some language for a sample letter requesting sublet permission. Use it in part or full when submitting your proposal.