St. Paul's historic Landmark Center, completed in 1902, originally served as the United States Post Office, Courthouse, and Custom House for the state of Minnesota. It was designed by Willoughby J. Edbrooke, who served as Supervising Architect of the U.S. Treasury Department in 1891–92. Edbrooke designed a body of public architecture, much of which, like this structure, was completed after his 1896 death. Landmark Center stands at 75 West Fifth Street in Rice Park and is now an arts and culture center. (courtesy of Wikipedia)
You can read more about it HERE