Come up with a question and reasoning that would justify this answer: in the borough of Manhattan in New York City , between Central Park / Fifth Avenue , 59th Street , the East River , and 96th Street
The question is: The Upper East Side is a neighborhood in the borough of Manhattan in New York City, between Central Park / Fifth Avenue, 59th Street, the East River, and 96th Street. The area incorporates several smaller neighborhoods, including Lenox Hill, Carnegie Hill, and Yorkville. Once known as the Silk Stocking District, it is now one of the most affluent neighborhoods in New York City.

Answer this question based on the passage: where is the upper east side of nyc?
Step-by-step reasoning process: The relevant information is: The Upper East Side is a neighborhood in the borough of Manhattan in New York City, between Central Park / Fifth Avenue, 59th Street, the East River, and 96th Street.