An urban neighborhood remakes itself every day--and unmakes itself, too. Houses and stores and streets define it in one way. But it's also people--the people who make it their home, some eagerly, others grudgingly. A neighborhood can thrive or it can decline, and neighbors move in and move out. Sometimes they stay but withdraw behind fences and burglar alarms. If a neighborhood becomes no longer a place of sociability and street life, but of privacy...