For the purposes of the article: “Interest in real property” means any right in real property, including access thereto or improvements thereon, or water, including but not limited to an open-space easement or conservation easement, provided such interest complies with the requirements of the U.S. Internal Revenue Code § 170 (h), partial interest, mineral right, remainder or future interest, or other interest or right in real property. “Land” or “lands” means real property, with or without improvements thereon; rights-of-way, water and riparian rights; easements; privileges and all other rights or interests of any land or description in, relating to or connected with real property. “Public or Private Conservation Agency” means any Virginia governmental body, or any private not-for-profit charitable corporation or trust authorized to do business in the Commonwealth and organized and operated for natural resources, land conservation or historic preservation purposes, and having tax-exempt status as a public charity under the U.S. Internal Revenue Code of 1986, as amended, and having the power to acquire, hold and maintain land and/or interests in land for such purposes.