The Department of the Treasury is delegated authority to lease the following types of special purpose space:

(a) Space and land incidental thereto for the use of the Comptroller of the Currency, as well as the operation, maintenance and custody thereof (if unimproved, land may be leased only on a fiscal year basis; lease term for space, including all options, limited to 5 years).

(b) Aerostat radar facilities necessary for U.S. Custom Service mission activities.