Ten adult ballet classes at the Dokoudovsky New York Conservatory of Dance.  

Classes are available at all levels.

http://www.nycod.org/
http://www.nycod.org/schedule1.html

The New York Conservatory has been a premier ballet school in New York City for over 30 years. 
Open classes for adults of all ages and levels, from beginner through advanced, with special attention to adult beginners.

The school is located in a beautiful studio in midtown Manhattan at 30 East 31st Street between Madison and Park Avenue South.