• Richard Brevard Russell Building, named for the late Senator Russell of Georgia.
• Everett McKinley Dirksen Building, named for the late Senator Dirksen of Illinois.
• Philip A. Hart Building, named for the late Senator Hart of Michigan.

The U.S. Congress resides in the House Office Buildings (HOB) and the Senate Office Buildings. The offices for the U.S. Congress are in the House Office Buildings, or HOB, and the Senate Office Buildings. As you can see, the Senate Office Buildings are very appropriately named.

See http://www.senate.gov/ for more info.