§ 552.31 Definitions. As used in §§ 552.30 to 552.39, the following definitions apply: ( a ) *Real estate.* Real estate includes lands and interests therein, leaseholds, standing timber, buildings, improvements, and appurtenances thereto owned by the United States and under the control of the Department of the Army. It also includes piers, docks, warehouses, rights-of-way, and easements, whether temporary or permanent, and improvements permanently attached to and ordinarily considered real estate. It does not include machinery, equipment, or tools which have not been affixed to or which have been severed or removed from any such lands or buildings or may be so severed or removed without destroying the usefulness of the structures.
( b ) *Installation.* An installation is real estate and the improvements thereon which is under the control of the Department of the Army, at which functions of the Department of the Army are carried on, and which has been established by order of the Department of the Army. Real estate and the improvements thereon utilized by posts, camps, airfields, hospitals, depots, arsenals, industrial facilities, cemeteries, etc., generally will be designated as an installation where located separately, but where located contiguously or on the same reservation the combined property will usually be designated as one installation and the separate functions will be designated as activities at that installation. As used in the regulations in §§ 552.30 to 552.39, the term “installation” will include installations, subinstallations, and separate locations housing an activity.
( c ) *Subinstallation.* A subinstallation is real estate and the improvements thereon which is under the control of the Department of the Army, at which functions of the Department of the Army are carried on, and which has been assigned as a subinstallation by Department of the Army authority. Subinstallations are attached to installations for command and administrative purposes, although they are located separately.
( d ) *Activity.* An activity is a function or a group of related functions which may be carried on at an installation, a subinstallation, or a separate location which has not been designated as a Department of the Army installation or subinstallation.
( e ) *Command installation.* A command installation is any installation of the Department of the Army, including nonmanufacturing arsenals, primarily used or useful for activities of the Army other than for the production of materiel, munitions, or supplies.
( f ) *Industrial installation.* Any unit of real property under control of the Department of the Army (including structures on land owned by or leased to the United States, substantially equipped with production utilities and maintenance machinery, tools, equipment, and including housing and other supporting facilities built as an integral part of the installation) designed for the production of equipment, supplies, or materials for military use; or for the processing, production, or manufacturing of components of such items.
( g ) *Lease.* A lease is a conveyance of an interest in real estate for a term of years, revocable at will, or as otherwise provided in the instrument in consideration of a return of rent.
( h ) *License.* A license is a bare authority to do a specified act or acts upon the land of the licensor without possessing or acquiring any estate therein.
( i ) *Easement.* An easement is a conveyance of an interest in real estate for the purpose or purposes specified in the grant.