The Department of the Interior is delegated authority to lease the following types of special purpose space:
(a) Space in buildings and land incidental thereto used by field crews of the Bureau of Reclamation, Bureau of Land Management, and the Geological Survey in areas where no other Government agencies are quartered (unimproved land may be leased only on a fiscal year basis).
(b) National Parks/Monuments Visitors Centers consisting primarily of special purpose space (e.g., visitor reception, information, and rest room facilities) and not general office or administrative space.