17 C.F.R. § 171.3 Business address; hours.
Title 17 - Commodity and Securities Exchanges
The principal office of the Commission is located at Three Lafayette Centre, 1155 21st Street, NW., Washington, DC 20581. It is open each day, except Saturdays, Sundays, and legal public holidays, from 8:15 a.m. until 4:45 p.m., eastern standard time or eastern daylight savings time, whichever is currently in effect in Washington, DC. [55 FR 41068, Oct. 9, 1990, as amended at 60 FR 49336, Sept. 25, 1995]
Title 17: Commodity and Securities Exchanges
PART 171—RULES RELATING TO REVIEW OF NATIONAL FUTURES ASSOCIATION DECISIONS IN DISCIPLINARY, MEMBERSHIP DENIAL, REGISTRATION AND MEMBER RESPONSIBILITY ACTIONS
Subpart A—General Provisions
§ 171.3 Business address; hours.

