Due to a lack of funding, New York City's public school buildings fall significantly short of providing adequate classroom space and technology support. Some policy changes that could promote more intensive use of school buildings and thus provide a comprehensive and affordable solution to this problem are described. It is suggested that instruction be extended throughout the year so that the extended school hours would allow two shifts of children to be instructed in the same building over the course of a single day without overcrowding the facility or reducing the amount of instruction each child receives. Using each school more intensively also would reduce the number of buildings the school system needs. This would allow the School Board to target its limited resources to create a network of facilities that would support better learning. It is recognized that instituting such changes would place demands on school administrators, families, and social service institutions, but such demands are not insurmountable. Two appendixes provide methodologies for estimating the capital impact and the operational impacts that such a plan would require. Contains 7 tables and 11 graphs. (RJM)