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Delmonico's is the name of various New York City restaurants of varying duration, quality, and fame.
The original and most famous was operated by the Delmonico family at 2 South William Street in Lower Manhattan, during the 19th and early 20th centuries, when it gained a reputation as one of the nation's top fine dining establishments. The birthplace of the widely imitated Delmonico steak, the restaurant is credited with being the first American restaurant to allow patrons to order from a menu à la carte, as opposed to table d'hôte. It is also claimed to be the first to employ a separate wine list.
The family also opened other restaurants under the name, operating up to four at a time and ultimately totaling 10 establishments by the time it departed the business in 1923.
In 1926, restaurateur Oscar Tucci purchased the ground floor and the basement of the 70,000-square foot building at 56 Beaver Street and reopened Delmonico's as a speakeasy. During the 1920s & 30s the upper floors of 56 Beaver Street, were being used as offices for ship insurance, legal offices, and other types of offices. In 1933, after the repeal of Prohibition, Tucci was given the third liquor license in New York City and quickly renamed the restaurant to Oscar's Delmonico's. By the 1940s Tucci was able to purchase the entire building. Delmonico's in the Tucci era was open through 1986 with its final closure of the Greenwich, Connecticut, location after the death of Oscar Tucci's son Mario Tucci. Other Delmonicos have operated in the space from the late 1980s to 1992 and since 1998.

Source: Wikipedia