After months of financial concerns about constructing the transit hub at the World Trade Center as designed by Santiago Calatrava, the Port Authority appears to be giving up a "key element" of the design, according to the NY Times.

Calatrava had designed a "vast underground mezzanine free of columns," but that is expensive and complex. The architect, who already revised the design, believes it can be built on budget, and his statement said, “It has always been my goal to deliver a beautiful, practical transportation hub for Lower Manhattan. In its revised state, the project retains all of its fundamental beauty, and the adjustments make it an ever-more-functional and coherent facility that will serve New York well in the years to come.”

The Times says the Port Authority is discussing two other designs: "an alternative calling for reuse of existing columns" and "an alternative that would use...'a more traditional column-supported structural approach to the PATH mezzanine.'" It's possible a combination will be used, too.

Last month, the Port Authority said the roof of the transit hub would no longer by retractable. The design will still retain its "winged" design.