Simple grid for streets; no master plan. Factories at best sites, near waterways. Tenements to maximize space for living. Rich neighborhoods filled w/ mansions, boulevard, back alleys. Focus on steel office buildings, fireproof, up to 20 stories. Public costs funneled into new architecture: schools, courthouses, capitols, hospitals, museums, art galleries. Streetcars, elevated RR help people, goods, info move fast: electric cars tested in 1888, popular in 1895. Subway starts 1902.