"Sen. Paul E. Tsongas of Massachusetts, addressing the International Downtown Executives Association in Washington early this year, stressed the importance of the city center with these words: "I firmly believe that no matter what we do for the neighborhoods, if we let the downtown fail, then the whole city goes. In a real sense, the downtowns are everybody's neighborhood. And it becomes everybody's problem to see that they are as strong and healthy and vibrant as the heart of the city should be.""