West of the river the buildings turn to brick and glass and loading docks, but there is still grass in it — courtyard lawns, the strips along Randolph, the wide green of Union Park holding its ground between the expressway and the Loop. L A Valet INC keeps those pieces cut and trimmed through the long midsummer weeks when the city bakes and turf needs a steady hand. Mowing, edging back to the concrete, trimming around posts and railings, and cleanups when spring and autumn each leave their particular mess. In a neighborhood this hard-surfaced, a maintained lawn does a great deal of work for the eye. The result leaves a place looking deliberate.