New York's Fifth Avenue, America's 'Street of Dreams' is one of the most remarkable thoroughfares in the world. Shown on the Commissioners' map of 1807 emerging from a country road, then in the proposed grid plan of 1811 as one of the major boulevards, Fifth Avenue by the end of the century was synonymous with a lavish fashionable life, grand mansions, and services catering to the wealthy. Above Washington Square, in the 1840s and 50s, mainly speculative...