The panel's vote effectively clears the way for building permits to be issued in the months ahead and for construction plans to be drawn up for a hoped-for opening in late 2016.
Preparatory work for demolition at the site is slated to begin this month.
The firm went back to the drawing board after the commission, during a February meeting, found fault with its renderings, saying it did not feel all architectural components of the planned building fully blended with the surrounding historic district.
The changes that won over the commission were not minor: Architects replaced a cupola with a less-glaring, square-edged element lower on the building; reworked the front entrance on Third; and added to the facade on Chestnut a large lobby window and full-size replica along the sidewalk of John Trumbull's famous painting hanging in the Capitol Rotunda, The Signing of the Declaration of Independence.
The commission voted, 9-0, Wednesday in favor of the amended design. Museum president and CEO Michael Quinn called the commission's unanimous approval of the redesign "terrific news."
Asked how much the new elements would add to the project's cost, Quinn estimated hundreds of thousands of dollars. But this would be covered by funds set aside for contingencies, and would not change the budgeted price tag.
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Art Commission director William J. Burke Jr. said the designers responded head-on to concerns that the original concept contained something of a "mishmash" of architectural styles. How unusual was it for a group to respond so on-point to the panel's recommendations? "This particular group did it quite well," he said.
And although one more commission vote is required, next month, to formalize the approval, the vote Wednesday effectively means the process of applying for building permits and preparing construction plans may proceed, according to CEO Quinn.
Early-phase demolition work could begin in about a week, with the installation of a fence, followed by asbestos removal inside the long-vacant Independence National Historical Park visitor center (a structure built for the nation's Bicentennial), that will be torn down to make way for the new museum.