term:

Ground Rent

ground rent n

1 : the rent paid by a lessee for the use of land esp. for building
2 : a rent charge reserved to himself or herself or his or her heirs by the grantor of land in fee simple, on perpetual lease, or on lease for a renewable term of years NOTE: Ground rent in this sense is found chiefly in Pennsylvania and Maryland.

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.