In the 2000s, the perceived northern boundary on Park Avenue has edged over 96th Street into what was traditionally Spanish Harlem,[3] leading to that area sometimes being called Upper Carnegie Hill, especially by real-estate brokers.
Facing it across 91st Street is the Italian palazzo-style Otto H. Kahn House, currently the home of the Convent of the Sacred Heart, a Roman Catholic girls' school.
[14] Besides, Andrew Carnegie, Marjorie Merriweather Post, Margaret Rockefeller Strong and John Hay Whitney all made their homes north of 90th Street.
[16] Proponents include the 93rd Street Beautification Association[17] and Carnegie Hill Neighbors,[18] organizations which, seeking to preserve the village-like environment, spurred the creation of the historic district and actively monitor its well being.
[19] In its more than thirty years of operation, its well-publicized battles have included advocating against an adult education center near the 92nd Street Y, plans for more high rise apartments and additions to existing brownstones.