Some student centers carry unique origins and historical significance with some on the National Register of Historic Places. The William Pitt Union was originally constructed in 1898 as a hotel and was converted into a student center in 1956. Some student activity centers on the NRHP include O'Hara Student Center (University of Pittsburgh), McKenny Hall (Eastern Michigan University), and the Tivoli Student Union. The Tivoli Student Union was originally home to the Trevoli Brewing Company but since has been converted to serve several institutions in Denver, Colorado.