Parkway Gardens Apartment Homes, commonly also known as O'Block, is a gated private apartment complex in the Greater Grand Crossing community area on the border of Woodlawn and Washington Park, on the South Side of Chicago, Illinois. The complex was built from 1950 to 1955; architect Henry K. Holsman, who planned several of Chicago's afford…Parkway Gardens Apartment Homes, commonly also known as O'Block, is a gated private apartment complex in the Greater Grand Crossing community area on the border of Woodlawn and Washington Park, on the South Side of Chicago, Illinois. The complex was built from 1950 to 1955; architect Henry K. Holsman, who planned several of Chicago's affordable housing developments, designed the Modernist buildings.