The Chicago Spire was a supertall skyscraper project in Chicago, Illinois, which was abandoned in 2008 with only its foundation work completed. The construction was halted after several years of on-going financing challenges, including the global recession that began in 2008.Anglo Irish Bank Corp. filed a US$77 million foreclosure lawsuit against The Spire's Irish developer Garrett Kelleher, claiming that loans made to Kelleher’s development company had been in default for a year. The bank was expected to take possession of the site where the Spire was to have been built.^{[citation needed]}

The building was designed by Spanish architect Santiago Calatrava and was being developed by St Patrick's Athletic owner Garrett Kelleher of Shelbourne Development Group, Inc. At 2,000 feet (610 m) and with 150 floors, it would have been among the world's tallest buildings and freestanding structures, after the Burj Khalifa, and the tallest building in the United States and the Western Hemisphere, surpassing the CN Tower. Originally proposed by Christopher T. Carley of the Fordham Company in 2005, the project was supported by many Chicagoans and city officials.

Chicago (ⁱ/ʃɪˈkɑːɡoʊ/ or /ʃɪˈkɔːɡoʊ/) is the largest city in the US state of Illinois and the third most populous city in the United States after New York City and Los Angeles. The city has around 2.7 million residents. Its metropolitan area, sometimes called "Chicagoland", is the third largest in the United States, with an estimated 9.8 million people. Chicago is the county seat of Cook County, though a small portion also extends into DuPage County.

Chicago was incorporated as a city in 1837, near a portage between the Great Lakes and the Mississippi River watershed. Today, Chicago is listed as an alpha+ global city by the Globalization and World Cities Research Network, and ranks seventh in the world on the 2012 Global Cities Index. The city retains its status as an international hub for finance, industry, telecommunications and infrastructure, with O'Hare International Airport being the second busiest airport in the world in terms of traffic movements. In 2008^[update], the city hosted 45.6 million domestic and overseas visitors. Among metropolitan areas, Chicago has the 4th largest Gross Domestic Product (GDP) in the world, ranking just behind Tokyo, New York City, and Los Angeles. Chicago is one of the most important Worldwide Centers of Commerce and trade.