Eastchester sits on marble. The pale Tuckahoe stone quarried here built half the walls in town, and it still edges yards along the older streets. Frank's Landscaping mows and trims the lawns those walls hold in, keeping the turf level to the coping so the line where green meets stone stays honest. Summer arrives humid and heavy off the Sound and the grass runs with it; the answer is showing up on schedule, week after week, with sharp blades. Cleanups pull the drift of leaves out of the border beds before the cold packs them down. A yard that reads crisp from the sidewalk is the entire point of the job.