555 17th Street
555 17th Street, formerly known as the Anaconda Tower and the Qwest Tower, is a skyscraper in Denver, Colorado. The building was completed in 1978, and rises 40 floors and 507 feet (155 m) in height. The building stands as the seventh-tallest building in Denver and Colorado. It also stood as the tallest building in the city at the time of its 1978 completion, and held that distinction for three years until it was surpassed by the 709-foot (216 m) 707 17th Street in 1981. 555 17th Street was built as the " Anaconda Tower", a name it was given for its distinctive reflective and textured black glass façade. The building became the world headquarters of Qwest in 1997, at which point it was adorned with two large Qwest signs. The building served as Qwest's headquarters until 2000, when the corporation moved to 1801 California Street, the second-tallest building in Denver situated two blocks away. Although Qwest moved its headquarters in 2000, the two brightly lit blue signs on 555 17th Street remained in place for four more years. Qwest finally removed the logos in 2004, but prior to that the signs were left dark for several months. 555 17th Street is composed entirely of Class A office space, containing features such as a tenants' restaurant, private club, and conference center. The building is home to the offices of big-four accounting firm Deloitte & Touche. Holland & Hart, a major law firm, has its headquarters in 555 17th Street. The building's largest tenant is still Qwest, although the structure no longer bears the company's insignia. 555 17th Street has been installed with several environmentally "green" features, including a 600-ton flat plate heat exchanger and electronic ballast lighting technology. The building's management company, Mile High Properties, estimates that the upgraded features have generated savings of US$$1,835,000 in five years. Due to its green features, 555 17th Street has been designated a "Labeled Building" by Energy Star and the United States Environmental Protection Agency.

Ogilvy PR Worldwide - Third floor JWT - Third floor Clarity Media Group - Seventh floor Examiner.com - Fourth floor Hyatt Denver Convention Center - Eighth floor RSM McGladrey Inc. and McGladrey & Pullen LLP - Tenth floor Anschutz Corporation - Twenty-fourth floor Monticello Associates - Twenty-sixth floor Holland & Hart LLP - Law Firm - Thirty-second floor Colorado Rapids Soccer - Thirty-third floor Ernst & Young LLP - Thirty-third floor Deloitte & Touche LLP - thirty-third, thirty-fifth, thirty-sixth floors