Technically, this was W.R. Frank’s Inferno, located at the Tremont Plaza Motor Hotel at 517 Excelsior Blvd. (now Mainstreet) in Hopkins.

The Tremont was built in 1960.

Postcard image courtesy Hennepin County Library, per James Kenline

From the ad below it appears that the nightclub, formerly called the Cellar, opened on February 25, 1972.

Minneapolis Tribune, February 1972

Minneapolis Tribune, August 1972

It is now called the Hopkins Park Plaza Apartments and rents out fully-furnished apartments.

A more recent view of the building.