In addition to applicable definitions contained in 36 CFR part 1, the following definitions shall apply to this part:

(a) Adaptive Use means the act or process of adapting a structure to a use other than that for which it was designed.

(b) Authorized Officer means an officer or employee of the National Park Service designated to conduct leases or exchanges and delegated authority to execute all necessary documents including leases and deeds.

(c) Fair Market Rental Value means the most probable rent that the property would command if it were exposed on the open market for a period of time sufficient to attract a tenant who rents the property with full knowledge of the alternatives available to him on the market.

(d) Fair Market Value means the amount in cash, or terms reasonably equivalent to cash, for which in all probability, the property would be sold by a knowledgeable owner willing but not obligated to sell to a knowledgeable purchaser who desired but was not obligated to buy.

(e) Historic property means any prehistoric or historic district, site, building, structure, or object included in, or eligible for inclusion on the National Register of Historic Places.

(f) Lease means a written contract by which use and possession in land and/or improvements is given to another person for a specified period of time and for rent and/or other consideration.

(g) Leasehold interest means a contract right in property consisting of the right to use and occupy real property by virtue of a lease agreement.

(h) National Register or National Register of Historic Places means the national register of districts, sites, buildings, structures, and objects significant in American history, architecture, archeology, engineering, and culture, maintained by the Secretary of the Interior under authority of section 101(a)(1) of the National Historic Preservation Act of 1966, as amended (80 Stat. 915, 16 U.S.C. 470 et seq. (1970 ed)).

(i) Preservation means the act or process of applying measures to sustain the existing terrain and vegetative cover of a site and the existing form, integrity, and material of a structure. It includes initial stabilization work, where necessary, as well as ongoing maintenance.

(j) Preservation Maintenance means the act or process of applying preservation treatment to a site or structure. It includes housekeeping and routine and cyclic work scheduled to mitigate wear and deterioration without altering the appearance of the resource, repair or replacement-in-kind of broken or worn-out elements, parts, or surfaces so as to keep the existing appearance and function of the site of structure, and emergency stabilization work necessary to protect damaged historic fabric from additional damage.

(k) Reconstruction means the act or process of accurately reproducing a site or structure, in whole, or in part, as it appeared at a particular period of time.

(l) Rehabilitation means the act or process of returning a property to a state of utility through repair or alteration that makes possible an efficient contemporary use while preserving those portions or features of the property that are significant to its historical, architectural, and cultural values.

(m) Restoration means the act or process of recovering the general historic appearance of a site or the form and details of a structure, or portion thereof, by the removal of incompatible natural or human-caused accretions and the replacement of missing elements as appropriate. For structures, restoration may be for exteriors and interiors, and may be partial or complete.