The American Institute of Architects is looking to supplant the idea of replacing the Gowanus Expressway with a tunnel, and instead proposes a suspended highway and formation of a Gowanus Greenway. In 2006, the Dept. of Transportation gave a green light to a $12.8 billion proposal to build a 3.5 mile, seven lane tunnel underneath the Brooklyn Waterfront and then destroying the elevated highway. The plan for a Gowanus Tunnel appears to be in perpetual......