"Downtown is the heart of any city. It is the most valuable land in the city, with businesses, entertainment, shops, government and transportation lines competing for space. It is this competition for space which causes buildings to rise highest above the ground, and go give the downtown the distinctive skyline which identifies a Providence, Boston and Manhattan. It is this skyline, in combonation with the architecture, building layout, and general appearence, which provides a sense of surprise and discovery to city centers, and which differentiates one city center from another."