1. In Equipment leasing, this is on ongoing type of lease arrangement. Additional equipment is leased by simply doing a new lease schedule for the new equipment rather than doing a new lease contract. This is a line of credit the lessee draws upon to finance more equipment. The original lease contract applies to any new additions. 2. In Real estate leasing, this is the controlling lease that allows the lessee to sub-lease the property for a period within the master lease's term.