Michigan Compiled Laws, Chapter 324. Natural Resources and Environmental Protection § 324.2140

(a) “Conservation easement” means an interest in land that provides limitation on the use of land or a body of water or requires or prohibits certain acts on or with respect to the land or body of water, whether or not the interest is stated in the form of a restriction, easement, covenant, or condition in a deed, will, or other instrument executed by or on behalf of the owner of the land or body of water or in an order of taking, which interest is appropriate to retaining or maintaining the land or body of water, including improvements on the land or body of water, predominantly in its natural, scenic, or open condition, or in an agricultural, farming, open space, or forest use, or similar use or condition.

(b) “Historic preservation easement” means an interest in land that provides a limitation on the use of a structure or site that is listed as a national historic landmark under chapter 593, 49 Stat. 593, 16 U.S.C. 461 to 467, commonly known as the historic sites, buildings, and antiquities act; is listed on the national register of historic places pursuant to the national historic preservation act of 1966, Public Law 89-665, 16 U.S.C. 470 to 470a, 470b, and 470c to 470x-6; is listed on the state register of historic sites pursuant to Act No. 10 of the Public Acts of 1955, being sections 399.151 to 399.152 of the Michigan Compiled Laws; or is recognized under a locally established historic district created pursuant to the local historic districts act, Act No. 169 of the Public Acts of 1970, being sections 399.201 to 399.215 of the Michigan Compiled Laws, or requires or prohibits certain acts on or with respect to the structure or site, whether or not the interest is stated in the form of a restriction, easement, covenant, or condition in a deed, will, or other instrument executed by or on behalf of the owner of the structure or site or in an order of taking, if the interest is appropriate to the preservation or restoration of the structure or site.