Briarcliff Manor sits high on the western slope of Mount Pleasant, close enough to the Hudson that April wind arrives with a little river in it. Harter Landscaping of Briarcliff opens the year there — winter debris pulled off the lawns, beds edged back, the first cut of the season leaving the grass looking awake again. Through summer the work settles into the weekly cadence of mowing and trimming these hillside properties, where every yard has a grade to respect. Then the calendar flips, and the same driveways get plowed and the same walks shoveled while the ridge is still dark. It is a full circuit of the year, and the measure of it is a property that looks looked-after in every month of it.