Direct lease space is more expensive and more stable while sublease space is less expensive but shorterterm in nature. Subletting a commercial property is similar to assigning one, yet both transfer methods have very different outcomes.Sub-leasing means that someone else is leasing the property from the landlord, and you are leasing from them (hence the "sub"). The failure of the tenant to retain a reversionary interest in the lease is one of the key distinctions between an assignment and a sublease. 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. Subleasing is usually less expensive than direct leasing space. Some of this is because the original lease rate is set in the past. Subletting: The process of renting out a portion or all of the leased space to a third party. Importance of Lease Agreements in Business.