The present H-shape of the PDX terminal, designed by Zimmer Gunsul Frasca Partnership, was completed on September 10, 2001, when the new A, B and C concourses, as well as the light rail line, were finished. Probably the most stunning portion of PDX's interior, the new concourses reflect a Northwest theme, focusing heavily on the nearby Columbia River. A huge celebration was to be held the following weekend, but the events of September 11, 2001, interceded. The new concourses, designed to be public spaces, were closed to non-passengers.