Conservation land is defined as real property that is used to assist in the preservation of a natural area, used for the environmental education of the public, used to promote conservation generally, or used as a sanctuary for wildlife. Conservation land is subject to a perpetual conservation easement donated to a land trust on or after July 1, 1991; or acquired by a land trust by July 1, 1991, owned in fee by that land trust; and subject to a letter of intent, agreement, or option agreement to convey the property to a government agency. The owner of conservation land may receive a tax credit equaling 100% of any county real property tax imposed on the conservation land, not including any improvements.

Conservation land means real property that is: 1. used to assist in the preservation of a natural area, used for the environmental education of the public, used to promote conservation generally, or used for the maintenance of: a natural area for public use; or a sanctuary for wildlife; and 2. subject to a perpetual conservation easement donated to a land trust on or after July 1, 1991; acquired by a land trust on or after July 1, 1991; owned in fee by that land trust; and subject to a letter of intent, agreement, or option agreement to convey the property to a government agency; or owned by the Potomac Conservancy.