New York apartments...400 square feet to large

New York is known for its small apartments. The City has now asked architects to see if they can design space as small as 250 sf for apartment dwellers. Population growth and climbing rents, these may be needed to house people affordably in the future. San Francisco recently approved apartments as small as 220 sf.  In 1987, New York passed a requirement that apartments be a minimum of 400 sf.