Autumn dusk in Mount Vernon arrives early, the London planes along the avenues dropping their big leaves onto parked cars and stoops from Fleetwood down toward the Hutchinson. Tree Trimming & Removal works the city's tight lots, where a back yard is the size of a room and everything overhead belongs to somebody. Trimming and pruning keep crowns off the gutters, the wires and the neighbor's garage — small cuts, shape intact. A removal here is all rope and patience, lowered in short lengths over a fence with a driveway on one side and a porch on the other. After a storm, cleanup means a swept sidewalk and a clear curb before the morning walk to school.