PHILADELPHIA (AP) — A developer is taking the first steps to get approval for Philadelphia to be home to one of the nation's tallest skyscrapers.

The proposed American Commerce Center would have space for offices, hotel rooms, retail and entertainment. A councilman introduced legislation Thursday for needed zoning changes.

At 1,500 feet, the Commerce Center would top the current tallest U.S. building. That's the Sears Tower in Chicago. But New York and Chicago have projects in the works that would be even bigger.

Philadelphia residents worry the tower would be out of scale with the surrounding area. Neighbors say it may block the sun and bring too much traffic.

The proposal can't be acted on until September because the council started a summer break on Friday.