I[m sure there must be other 1600 Pennsylvania Avenues in different cities, too. 10 Downing street reminds me of one of the oldest jokes I know...from elementary school. When Lumumba went to England to visit the Prime Minister, the taxi took him to number 1 Downing Street. Do you know what he said? "Take Lumumba from 1 to 10." It was very funny in elementary school...