Tower (formerly the Texas Commerce Tower), which was completed in 1982. In 2002, it was the tallest structure in Texas, ninth-tallest building in the United States, and the 23rd tallest skyscraper in the world. In 1983, the 71-floor, 296 m (970 ft) Wells Fargo Plaza was completed, which became the second-tallest building in Houston and Texas, and 11th-tallest in the country. Skyscraper construction in downtown Houston came to an end in the mid-1980s with the collapse of Houston's energy industry and the resulting economic recession. Twelve years later, the Houston-based Enron Corporation began constructing a 40-floor, 1,284,013sq.ft skyscraper in 1999 (which was completed in 2002) with the company collapsing in one of the most dramatic corporate failures in the history of the United States only two years later. Chevron bought this building to set up a regional upstream energy headquarters, and in late 2006 announced further consolidation of employees downtown from satellite suburban buildings, and even California and Louisiana offices by leasing the original Enron building across the street. Both buildings are connected by a second-floor unique walk-across, air-conditioned circular skybridge with three points of connection to both office buildings and a large parking deck. Other smaller office structures were built in the 2000–2003 period. As of January 2015, downtown Houston had more than 44 million square feet (4,087,733 m²) of office space, including more than 29 million square feet (1,861,704 m²) of class A office space. Notable buildings Notable buildings that form Houston's downtown skyline: The Sweeney, Coombs, and Fredericks Building is a late Victorian commercial building with a 3-story corner turret and Eastlake decorative elements that was designed by George E. Dickey in 1889. Evidence indicates that the 1889 construction may have been a renovation of an 1861 structure built by William A. Van Alstyne and purchased in 1882 by John Jasper Sweeney and Edward L. Coombs. Gus Fredericks joined the Sweeney and Coombs Jewelry firm before 1889. The building is on the corner of Main Street and Congress Street at 301 Main Street. The jewelry firm is still in business. It is one of the very few Victorian structures in the Bayou City. The Gulf Building, now called the JPMorgan Chase building, is one of the preeminent Art Deco skyscrapers in the southern United States. Completed in 1929, it remained the tallest building in Houston until 1963, when the Exxon Building surpassed it in height. The Esperson