When Expansion Leads to Inner Space
Some of New York City's famous institutions that need space are expanding within and below their buildings; such is path being taken by South Court building of New York Public Library, which fills southern courtyard at Fifth Avenue and 40th Street, middle school of Packer Collegiate Institute, entirely new structure that will rise within nave of Victorian Gothic church in Brookly Heights, and Judy and Arthur Zankel Hall, carved from bedrock under main auditorium of Carnegie Hall; projects detailed; photos (M)
