Proposed super-tall tower shows some promise

On the American Commerce Center design

While it's a long shot of a project, the proposed 1,500-foot American Commerce Center at 18th and Arch Streets signals that Philadelphia is entering the age of super-tall towers. The project is being shopped around by Joseph Grasso and Garrett Miller's Walnut Street Capital, which spent $30 million on the site. Their ambitions for American Commerce Center are very grand, considering.

First, there is a 1,200-foot office tower (topped by a 300-foot spire) that would include 1.3 million square feet of office space (same as the Comcast Tower). But there is also supposed be a 477-foot-tall cubular doughnut that would house 300,000 square feet of retail in a five-level base, and a hotel located in the southern leg of an open rhomboid.

The architects, Kohn Pedersen Fox of New York, envision three plazas, which would host various cafes, a movie-theater complex, and the hotel ballrooms. The dense array of activities could, theoretically, be a smaller Philly version of the shops at Time Warner's building in Manhattan. There's even space set aside for an upscale supermarket in the lower level, just like Time Warner's Whole Foods space.

The architects have done some clever things with the design, such as hollowing out the lower structure to preserve some views for the Stirling on JFK Boulevard. The top level of the open rhomboid would have gardens and meeting rooms that could do double duty as a conference center for the office tenants and ballrooms for the hotel.

But it would be nice if designers Eugene Kohn and William C. Louie had worked out the architecture beyond this schematic form. You would think they'd be a little embarrassed at stealing the idea for the crown from Daniel Libeskind's original pass at the Freedom Tower in Lower Manhattan. And while the architects say they haven't begun to work on the details of the facade, it's disheartening to see their starting point is the same bluish glass used at the Cira Centre and half the new office buildings in New York.