As used in this act:
"Interest in real estate" means any right, title or estate in real estate, and shall include a lease of real estate, a lien on real estate, a profit, an easement, an interest in a trust in real estate and a share in a cooperative apartment.
"Transfer of an interest in real estate" means the sale, gift, creation or extinguishment of an interest in real estate.
N.J.S. § 25:1-10