Every new house on the benches above Silverthorne begins as raw graded dirt and a lot of imagination. By the time Columbine Hills Construction LLC is finished with the ground, that dirt is lawn — soil worked and softened, seed or sod set, edges cut true against the walk and the drive. Out toward Three Peaks the ground runs stony and steep enough to argue back, which makes the finished green all the more satisfying to stand on. Afterward comes the upkeep: mowing on a schedule, trimming close to foundations and fence lines, cleanups at both ends of the season. A yard that looks like it has always belonged on that lot is the whole point.