sentences:  Park Avenue and Lexington Avenue both pass through Lenox Hill, and along these avenues, there are many boutiques, art galleries and five-star hotels.Museums in the area include the Frick Collection.Based on data from the 2010 United States Census, the population of Lenox Hill and Roosevelt Island, which are combined into one census tabulation area, was 80,771, an increase of 4,140 (5.4%) from the 76,631 counted in 2000.