A sublease refers to a form of agreement between a tenant and a property owner, that allows a tenant to lease a property to a third party. This contract allows someone to lease a property that is already leased. In a sublease, the person renting the property from a tenant can only use the property for a period captured in the agreement between the property owner and the tenant.
Just as a property owner is transferring the owner's right of a property to another person (tenant) in a lease, the tenant will also transfer the owner's right to a third-part, but the contract will no longer hold after the expiration of the initial contract between the property owner and the tenant. Subleasing is legal as it gives a tenant the right to transfer his legal tenancy to another person. However, before a tenant can establish a sublease, the property owner must be notified.