Behind the brownstones off Van Vorst Park there are yards the width of a hallway, and in late afternoon the light comes over the rooflines in one long slant. Dominichino Cleaning works those small greens — mowing, running the trimmer tight to brick and iron, clearing beds so the magnolia has somewhere to drop its petals. A city lot rewards attention, because every square foot of it shows. By evening the grass lies even, the borders read as lines, and the yard feels twice the size it measures. That is the whole ambition, and it comes around again next week.