ON Halloween 2004, a block party on a street of houses rented to students at the University of Colorado ended with people in costumes running through the streets of the University Hill neighborhood, throwing bottles, setting fires and overturning cars.
In Madison, Wis., home to 41,000 University of Wisconsin students, David Worzala introduces himself each fall to the new students who move into the rental houses on his block, which includes five single-family homes and seven student rentals. His neighborhood association also sends representatives to the student houses each fall, accompanied by a police officer, to explain that they are living in a mixed community.