41 C.F.R. § 302-8.100
Extended storage of HHG belonging to an employee transferred or a new appointee assigned to an official station at an isolated location in CONUS may be allowed only when it is clearly justified under the conditions in this part and is not primarily for the convenience, or at the request of, the employee or the new appointee.
(a) As determined by the agency, an official station at an isolated location is a place of permanent or temporary duty assignment in CONUS at which employees have no alternative except to live where they are unable to use their HHG because:
Note 1 to § 302-8.100: Heads of agencies concerned are responsible for designating the isolated official station at which conditions exist for allowing extended storage of HHG at Government expense for some or all employees.