Parkway Gardens Apartment Homes, known as O-Block is a group of apartments with 694 units located in the Greater Grand Crossing area. It is also on the border of Woodlawn and Washington Park. Chicago's Greater Grand Crossing, Woodlawn, and Washington Park community areas are in the South Side of Chicago, Illinois. The apartments were built from 1950 to 1955 by Henry K. Holsman, who planned many of Chicago's affordable housing developments, and designed the Modern buildings.