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.Sub-letting is somewhat market based. Com is a website connecting renters with short-term sublets. Browse and find your suitable accommodations in San Antonio according to your preferences. This includes private housing properties in San Antonio. Subletting, also known as subleasing, involves renting out a property or a portion of it that you are currently leasing, to a new tenant. Use this guide to understand the process of subletting, how it differs from subleasing, and answers to common subletting questions. How Much Does a Sublease Cost? The average cost (i.e.