The Hamm Building, originally owned by the Hamm Brewing family, was built in 1919 [though I've researched 1915 and 1920 as the built date]. The building rests on the original site of the St Paul Cathedral where there is a natural spring well, perfect for hand crafted beer. The Hamm Building is now on the National Register of Historic Places. From the documents I've read, the building housed one of the city's biggest illeagal gambling operations in the late 1920's to early 1930's. Today, the Hamm Building's main function is office space.