D.C. Mun. Regs. tit. 1, § 1414
1414.1 Property shall be closed to the public during other than normal working hours, except in specific instances in which OPM has issued a permit for use after normal working hours.
1414.2 The decisions to close a property on an emergency basis shall be made by the Director, OPM. This action by the Director may be coordinated with affected District agency officials.
1414.3 When property or a portion thereof is closed, admission shall be restricted to authorized persons who shall do the following when requested:
(a) Sign a register upon entry; and
(b) Display government or other identifying credentials to Protective Services officials or other authorized individuals.
SOURCE: Final Rulemaking published at 36 DCR 1316, 1322-23 (February 17, 1989).