Downtown the shingles have weathered to silver, and by August the hydrangeas lean over the fences, blue as the harbor behind them. Hy Line services Inc mows and maintains lawns in that close-packed grid of lanes off the cobblestones, where every dooryard is small and every mistake shows. Handwork carries the day here — trimming close along brick and picket, keeping the strip of green between fence and sidewalk sharp. Some mornings the fog comes up off the water and softens the whole street, then burns away by ten and leaves the grass bright. Small yards, done properly, are what make a lane look looked-after.