Brentwood's ground is old outwash sand, quick to drain and quicker to brown, so a lawn out here truly earns its green. J Hernandez Landscaping inc keeps after that: mowing on a steady schedule, trimming along fences and walks, cutting the sidewalk line clean, clearing beds in spring and again once the leaves drop. Summer mornings start early on these streets, ahead of the heat and ahead of the traffic building toward the expressway. Block by block the difference is visible — a hedge line squared off, the strip of grass by the curb cut sharp, a front yard that lifts the whole house behind it. In a hamlet this large and this close-packed, a tidy front yard is its own kind of neighborliness.