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Delmonico's is a series of restaurants that operated in New York City, and Greenwich, Connecticut, with the present version located at 56 Beaver Street in the Financial District of Manhattan.

The original version was widely recognized as America's first fine dining restaurant. Beginning as a small cafe and pastry shop in 1827 at 23 William Street, Delmonico's eventually grew into a hospitality empire that encompassed several luxury restaurants catering to titans of industry, the political elite and cultural luminaries. In many respects, Delmonico's represented the genesis of American fine dining cuisine, pioneering numerous restaurant innovations, developing iconic American dishes, and setting a standard for dining excellence. Delmonico's (under the Delmonico family's ownership and management) shuttered all locations by 1923. In 1926, Delmonico's under new ownership by Italian immigrant Oscar Tucci reopened at 56 Beaver Street.

The original Delmonico's opened in 1827 in a rented pastry shop at 23 William Street, and appeared in a list of restaurants in 1830. It was opened by Italian-Swiss immigrants, the brothers Giovanni and Pietro Delmonico. In 1831, they were joined by their nephew, Lorenzo, who eventually became responsible for the restaurant's wine list and menu.

The brothers moved their restaurant several times before settling at 56 Beaver Street (also 2 South William Street). When the building was opened on a grand scale in August 1837 after the Great Fire of New York, New Yorkers were told that the columns by the entrance had been imported from the ruins of Pompeii. It eventually became one of the most famous restaurants in New York, with its reputation eventually growing to international prominence.

Beginning in the 1850s, the restaurant hosted the annual gathering of the New England Society of New York, which featured many important speakers of the day. In 1860, Delmonico's provided the supper at the Grand Ball welcoming the Prince of Wales at the Academy of Music on East 14th Street. Supper was set out in a specially constructed room; the menu was French, and the pièces montées represented Queen Victoria and Prince Albert, the Great Eastern and Flora's Vase. The New York Times reported, "We may frankly say that we have never seen a public supper served in a more inapproachable [sic] fashion, with greater discretion, or upon a more luxurious scale". In 1862, the restaurant hired Charles Ranhofer, considered one of the greatest chefs of his day.

The business was so successful that from 1865 to 1888, it expanded to four restaurants of the same name. At various times, there were Delmonico's at ten locations. By 1876, news of the prices at New York's restaurants, including Delmonico's, spread at least as far as Colorado where complaints about the cost of wine, eggs, bread and butter, potatoes, and coffee ("forty cents a cup"), appeared in the Pueblo Colorado Daily Chieftain.

In 1884, Republican presidential nominee James G. Blaine attended a dinner at Delmonico's with his wealthy backers. This was picked up by the press, and used against Blaine to show him as disconnected from poor and working-class Americans, particularly in a political cartoon of the dinner on the front page of the New York World. The menu from the dinner was also circulated by the Democrats for the same purpose. Blaine would go on to lose to Grover Cleveland in an election that was ultimately decided by a less than one thousand vote difference in New York.

In 1899, Delmonico's vacated the six-story Delmonico Building at Fifth Avenue and 26th Street. (The edifice was sold to John B. Martin, owner of the Martin Hotel, in May 1901.)

In 1919, Edward L.C. Robins purchased Delmonico's. Its grand location at Fifth Avenue and 44th Street closed in 1923 as a result of changing dining habits due to Prohibition. That location was the final incarnation of Delmonico's with continuity to the original.

Restaurants owned and operated by the Delmonico family

Location	Dates	Comments
23 William Street	December 13, 1827 – December 16, 1835 (destroyed by fire)	"Delmonico & Brother, confectioners" small cafe and pastry shop
25 William Street	March, 1830 – December 16, 1835 (destroyed by fire)	"Delmonico & Brother, confectioners and Restaurant Francais"
76 Broad Street	February 23, 1836 – July 19, 1845 (destroyed by fire)
2 South William Street/56 Beaver Street	August, 1837 – July 10, 1890. Rebuilt and reopened July 7, 1891, closed 1917	"Delmonico's Restaurant," informally called "The Citadel."
25 Broadway	June 1, 1846 – 1856	The Delmonico Hotel
Chambers Street and Broadway	1856 – October 26, 1876
East 14th Street and 5th Avenue	April 9, 1862 – September 11, 1876
22 Broad Street	1865–1893
Fifth Avenue and 26th St.	September 11, 1876 – April 18, 1899	Lobster a la Newberg invented here in 1876
112–114 Broadway near Pine St.	October 26, 1876 – 1888
Fifth Avenue and 44th Street	November 15, 1897 – May 21, 1923	The final Delmonico-owned restaurant

In 1926, Oscar Tucci purchased the restaurant and reopened Delmonico's, first calling it Oscar's Delmonico, at 56 Beaver Street. Tucci ran a speakeasy in the lower level of the restaurant. In 1933, Tucci received the third liquor license in New York after the repeal of Prohibition. In later years, Oscar Tucci, dropped "Oscar's" from the name and continued naming it Delmonico's. During the Tucci incarnation it adopted the original menus and recipes, and became distinguished in its own right, continuing to attract prominent politicians and celebrities, such as Lana Turner, Marilyn Monroe, Rock Hudson, Lena Horne, Elizabeth Taylor, Elvis, Etta James, JFK, Jackie Kennedy Onassis and others. Tucci also instituted many of the professional standards in use today in American restaurants known as the Delmonico Way, a method that is explained in the book The Delmonico Way; Sublime Entertaining & Legendary Recipes from the Restaurant that Made New York! by Max Tucci published by Rizzoli. By the 1940s, Tucci owned and operated the entire Delmonico building, operating 63,000s.f. of restaurant space. Making Delmonico's the largest restaurant in the world during its time. Oscar created lavish dining rooms on the upper floors of the building and created dining rooms for companies such as Lehman Brothers and universities such as Harvard, creating the Harvard Lunch Club. The Penthouse was the most lush of private rooms; it included a private dining room with fireplace and en suite bedroom, a private kitchen and roof top terrace. Other private rooms included, The Roman Room which was designed by Mario Tucci and Valerian Rybar, The Baroque Room, The Hunt Room, The Bulls & Bears, The Python Room, and the main dining room known as The Palm Room. It was in the Palm Room that Ralph Burns and his orchestra serenaded guests. During the height of the Tucci era, Delmonico's served over an outstanding, thousand lunches a day. In 1941, Oscar Tucci expanded the brand, opening Oscar's Delmonico uptown located at 146 E56th Street, according to Tips on Tables writer William Hawkins it opened "with a boom!" In 1948, Oscar expanded further opening Delmon's Restaurant at 75 William Street.

The Tucci era also produced four of the most prominent restaurateurs of the twentieth century: Sirio Maccioni of Le Cirque, Tony May of San Domenico and the Rainbow Room, Harry Poulakakos of Harry's located in Hanover Square, and Lello Arpaia, father to restaurateur Donatella Arpaia.

In 1981 the Tucci family penned a licensing deal with Edward Huber to operate "Delmonico's" at 56 Beaver Street and the restaurant reopened the following year, lasting until 1993. In 1984, Tucci's son Mario Tucci, Gina (Mario's wife) and sister Mary Tucci opened a second "Delmonico's" in Greenwich, Connecticut; it closed three years later due to Mario's untimely death.

In 1997, under a new licensing agreement with the Tucci family, the BiCE Group took over operations of the restaurant. The group renovated the location and reopened Delmonico's with Gian Pietro Branchi as executive chef. The restaurant reopened in May 1998 after a renovation by Morris Nathanson. In 1999, the restaurant was leased to the Ocinomled partnership. The restaurant closed temporarily in 2020 due to the COVID-19 pandemic. In January 2023, Delmonico's reopened under new ownership, Dennis Turcinovic and Joseph Licul signed a new lease on the building. Turcinovic and Licul welcomed Max Tucci (Oscar Tucci's grandson) to join them as Third Generation Partner and Global Brand Officer. The restaurant underwent interior renovation, and reopened September 15, 2023. New York City Mayor Adams attended the ceremonial ribbon cutting with Gina Tucci and the new Delmonico's team. Max Tucci welcomed "New York and the World back to Delmonico’s." In 2024, the Delmonico’s team, including Dennis Turcinovic and Max Tucci opened Delmonico’s sister establishment TUCCI - New York, located at 643 Broadway, New York, New York. Steve Cuozzo stated in the New York Post "Move over, Carbone — this new NYC Italian hotspot has the best meatballs."

Delmonico Potatoes were invented at Delmonico's restaurant, and possibly Chicken à la King, but it was most famous for Delmonico steak. Eggs Benedict were also said to have originated at Delmonico's, although others claim that dish as well.

It is often said that the name "Baked Alaska" was coined at Delmonico's as well, in 1867, by chef Charles Ranhofer. However, no contemporary account exists of this occurrence, and Ranhofer himself referred to the dish, in 1894, as "Alaska Florida", apparently referring to the contrast between extremes of heat and cold. It is also said that Lobster Newberg was invented at the restaurant. In the 1930s Delmonico's owner Oscar Tucci created the Wedge Salad at Delmonico's.

Delmonico's Italian Steakhouse is a chain of restaurants with six locations in Upstate New York and Florida. This chain has no connection to the Delmonico's Restaurant located at 56 Beaver Street.

• List of New York City Landmarks
• National Register of Historic Places listings in New York County, New York

• New York Architecture Images EDelmonico's

• Official website