Out in the East End the brick streets keep their old rhythm, and the yards behind those tall porches are narrow, shaded and full of corners. Quincy Yard Guy LLC does the close work those lots ask for: mowing the strip between walk and fence, trimming around iron railings and maple roots, carrying off whatever the summer drops. On a late-August evening that side of town smells like cut grass and warm brick, and a yard that got its turn that day announces itself from the sidewalk. The pleasure of it is small and exact — no stray blades on the steps, the line along the alley squared off, the whole lot sitting quiet and kept. Quincy first, and the nearby towns when the route runs that direction.