John C. Kluczynski Federal Building & US Post Office, Loop Station

Aerial black and white rendered photo of the Chicago Federal Plaza showing the Dirksen Courthouse, Kluczynski Federal Building, and Loop Post Office230 South Dearborn Street
Chicago, IL 60604

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Designed by Chicago architect Ludwig Mies van der Rohe and completed in 1975, the 43-story John C. Kluczynski Federal Building and Loop Station Post Office is named after former U.S. Congressman John Carl Kluczynski, who served from 1951-75. The building is part of the Chicago Federal Plaza, bordered by Clark Street (west), Jackson Boulevard (south), Dearborn Street (east), and Adams Street (north) in the city's downtown "Loop" district.

Property Manager: Antoine Bell

Public Hours: 7 a.m.– 6 p.m. Monday through Friday (except federal holidays)

For building service calls or more information, use the contact info box. For other federal government information, call toll-free 1-844-USA-GOV1.

Key Tenants

The building houses the Dept. of Labor, Drug Enforcement Administration, General Services Administration, Internal Revenue Service, and two U.S. Senators.

Public Services

  • Fitness Center – sub-basement (SM level)
  • Snack Shop & Convenience Store – 2nd floor
  • IRS Taxpayer Assistance Center – 24th floor
  • Federal Credit Union – 29th floor
  • Senator Tammy Duckworth's Office – 37th floor
  • Senator Dick Durbin's Office – 38th floor

Art in Architecture & Additional History

Aerial photo of the Calder Flamingo sculpture on the Chicago Federal PlazaThe main plaza to the north features Flamingo, a red steel creation by world-renowned sculptor Alexander Calder.

View in-depth historical information on the Chicago Federal Plaza, including the Kluczynski and Metcalfe Federal Buildings and Dirksen U.S. Courthouse, among more than 80 properties featured in GSA's Public Buildings Heritage Program. Through an award-winning series of posters and brochures, this program details 150 years of notable construction and offers webpages explaining the architecture and history of select buildings.

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Last Reviewed: 2021-11-24