By the late 18th century, lower Greenwich Street had become part of one of the most fashionable residential neighborhoods in the city, lined with four-story Federal-style mansions, although upper Greenwich street was home to artisans, shopkeepers and an enclave of free blacks. Greenwich Street still maintained its status as a choice address in 1820, but by the 1850s, the wealthy residents had fled uptown, and private residences on the street became unusual. One who stayed for a time was hotel owner Amos Eno, who left once he was "surrounded by immigrant boarding houses," according to his daughter. In 1873, the Butter and Cheese Exchange opened on the street, not far from where dairy products arrived daily at the freight railroad terminals. By 1882, a steam generation plant of the New York Steam Company was located at Greenwich and Dey Streets.