Brookdale keeps a park with a rose garden in it, and for a few weeks every June the whole neighborhood carries a faint sweetness on the air. ATG Installations works the streets around there — mowing lawns down to an even nap, edging the walks so the slate remembers its own shape, trimming close along steps and fence lines. Essex County yards are compact and hemmed in by hedges and driveways, which means the finish work is most of the work. Done right, a small lawn reads bigger than it measures. That is the trick worth chasing on these blocks.