By seven on a June evening the light over the Macatawa flats goes long and gold, and the last stripe of mowing lays down darker than the one beside it. PRINCE Facility Services keeps grounds on both halves of the Holland calendar — mowing, trimming, edging and cleanups while things grow, then plowing, shoveling and salting once they stop. Downtown the sidewalks steam themselves clear along Eighth Street; a block over, a parking lot still wants a blade and a pass of salt before the doors open. The pride is in the small proof: a mow line running straight past an entrance in July, black pavement in January, nothing for anyone to think about either way. Grounds and snow work for properties in Holland and the towns close by.