Stuyvesant Fish House, 19 Gramercy Park South; March, 1909.

In 1845, the politician and Whig Party official Samuel Johnson, built a four-story townhouse at 86 Irving Place, just south of the newly-developed Gramercy Park (the fifth floor would added by its next owner, paper merchant Horace Brooks).

Just as developer Samuel Ruggles intended, Gramercy Park became a fashionable address in the latter 19th century, and attracted a set of socially prominent residents. In 1887, the house was purchased by Stuyvesant and Mamie Fish, the son of Secretary of State and New York governor Hamilton Fish. Mamie, a renowned hostess in possession of biting wit, immediately set about brining the townhouse up to her standards. The first order of business was a change of address, to the more desirable 19 Gramercy Park South.

Next, the Fishes hired architect Stanford White, himself a Gramercy Park resident, to lead a thorough redesign of the interior — including a top-floor ballroom. The spectacular results were described by Brendan Gill, writing in The New Yorker in 1979, as "Unquestionably, the greatest house remaining in private hands in New York." (Some sources, including the Times' Christopher Gray insist that another architect, Sidney V. Stratton, was responsible for the redesign.)

Mamie Fish, however, had her sights set on even greater things: the Fishes decamped for a new uptown mansion, also designed by White, in 1898. During the 20th century, the publicist and art collector Benjamin Sonnenberg lived at No. 19 for nearly 50 years.