As suggested by ColeValleyGirl, try looking for an unusual landmark in the photo that is likely to be still around today. In this case, there was a fountain that could be added to the search terms to greatly reduce the set of possible areas to peruse. With this small set, a quick scan of matching images reveals the matching intersection with the Seagram Building at 375 Park Avenue, between East 52nd and 53rd Streets, the fountain still remaining today and my guess of Park Avenue turned out to be correct.