Property is not subject to State property tax if the property is: owned by a land trust as defined in § 3-2A-01 of the Natural Resources Article that is certified by the Maryland Environmental Trust to be a land trust in good standing and to have a cooperative agreement in effect; and used: to assist in the preservation of a natural area; for the environmental education of the public; to conserve agricultural land and to promote continued agricultural use of the land; generally to promote conservation; or for the maintenance of a natural area for public use or a sanctuary for wildlife. To qualify for an exemption under this section, a land trust shall obtain a written certification every 5 years beginning July 1, 1998, or as scheduled by the Maryland Environmental Trust.