CHICAGO (AP) The city’s planning board has endorsed a proposal for a twisting lakefront tower that would become the nation’s tallest building.

With April 19’s approval from the Chicago Plan Commission, the design and site plan for the 2,000-ft. Chicago Spire goes to the city zoning committee.

“This is a wonderful project, and everyone is very enthused,” said Constance Buscemi, spokeswoman for the city’s planning department.

The 150-story tower, which would feature 1,200 residences, would unseat Chicago’s 1,451-ft. Sears Tower as the tallest U.S. building. It would also top New York’s 1,776-ft. Freedom Tower, under construction at the former World Trade Center site.

The Chicago Spire was designed by Santiago Calatrava, the Spanish-born architect known for designing the Milwaukee Art Museum addition and the Athens Olympic sports complex.

If the zoning panel approves the plan, the City Council will consider it May 9. If it is approved, construction would begin this spring, said Thomas Murphy, general counsel to developer Shelbourne Development Ltd.

Shelbourne executives have declined to estimate the building’s total development cost. Real estate experts put it at well over $1 billion, the Chicago Tribune and Crain’s Chicago Business reported on their Web sites April 19.

The tallest building in the world is the Taipei 101 tower in Taiwan, which measures 1,671 ft. and 101 floors. A tower in Dubai now under construction is expected to rise beyond 2,300 ft. and more than 160 floors.

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