Tappan is a town of straight lines — stone walls, the old village green, the DeWint House sitting square on its ground. Ground Rules Landscaping Inc works in that spirit across Orangetown: lawns mowed on a schedule, borders held, cleanups done before a yard gets away from anybody. Every property has its own rules — the slope that scalps, the shady strip that comes in thin, the corner where the mower has to lift. Learning those is most of the job. What is left is showing up and cutting it clean.