Flatbush, including Ditmas Park and Prospect Park South, is unusual for Brooklyn. Detached houses sit behind lawns, with private walkways, driveways and driveway aprons meeting the public sidewalk. Old, large street trees are everywhere. That adds up to root damage, cracked aprons where cars cross the curb, and long frontages that need a lot of concrete.
Along Flatbush Avenue, Church Avenue and Ocean Avenue, apartment buildings and storefronts have the opposite problem: hard-worn sidewalks with settled flags, worn surfaces and violations that landlords need cleared quickly.