555 17th Street (Denver, Colorado)

 office building, skyscraper

555 17th Street is a skyscraper in Denver, Colorado. The building has 40 floors and has a height of 507 ft (155 m). It was completed in 1978 and was originally named the Anaconda Tower. It was the tallest building in Denver from 1978 until 1981.

The building is composed entirely of Class A office space, containing features such as a tenants' restaurant, private club, and a conference center.

555 17th Street served as the world headquarters of Qwest from 1997 to 2000 when the company moved to 1801 California Street. During the company's tenancy, the building was adorned with two large Qwest signs which remained until 2004.

555 17th Street has been installed with several environmentally 'green'features such as a 600-ton flat plate hea exchanger and electronic ballast lighting technology. Because of the features, it has been designated a "Labelled Building" by Energy Star and the United States Environmental Proection Agency.