A commercial sublease is an agreement between the current tenant and the new tenant to lease the space together. Create your Pennsylvania sublease agreement and sublet your property.Rent your unit to a subtenant with our attorney-approved template. Our legal team can help you smoothly manage the commercial real estate purchase or leasing process. Search available sublease spaces in Pittsburgh Metropolitan Area, PA, USA. View property photos, floorplans, pricing details and more. Subleasing is the practice where an existing tenant rents out part or all of their leased commercial space to a third party known as the subtenant. The Guide explains what you should know when applying to rent, living in a rented property, and dealing with the end of a lease.