The new york restaurant in the great gatsby would likely be a high-end restaurant.
What is the restaurant?
Gatsby's parties showcase extravagance, which means that the characters patronize high-end establishments like Delmonico's, Sherry's, or the Waldorf Astoria's Peacock Alley. Gatsby's extravagant parties take place in West Egg, Long Island.
The novel mentions Gatsby's illegal dealings and the "bootleg aristocracy," hinting at visits to hidden speakeasies that were popular during Prohibition.