The 26-story structure is headquarters of the Humana Corporation and known for its postmodern architecture.[citation needed]It was designed by Michael Graves. Construction began in October 1982 and was completed in May 1985.[citation needed]
Each side of the building is designed slightly differently, up to a sloping pyramid style for the upper few floors. This basic design has led to the tower being locally known as "the Milk Carton".[citation needed] The building is also known for its exterior construction of flat pink granite.[citation needed] The north facade's loggia is respectful of the older downtown architecture, being perfectly flush with the original Main Street storefronts.[citation needed] The open-air front portion of the loggia contains a large fountain.[citation needed] The large, curved portion towards the top of the building is an open-air observation deck.[citation needed] The outermost point of the circle has space for a few people at a time to be surrounded by glass, allowing for a spectacular view of the Ohio River and down Main Street.[citation needed] The observation deck has not been open to the public since the September 11 terrorist attacks.