What is Building Lease?

Legal Definition
A lease of land for a long term of years, usually 99, at a rent called a "ground rent," the lessee covenanting to erect certain edifices thereon according to specification, and to maintain the same, etc., during the term.
-- Black's Law Dictionary
Legal Definition
A lease of land by which the lessee undertakes to erect buildings thereon.
-- Ballentine's Law Dictionary