Down by Assembly Square the Mystic runs wide and flat, and the green spaces are thin ribbons between buildings, parking and pavement. Green Ocean Property Management Somerville looks after that kind of grass — the strips, the courtyards, the shared front lawns of multi-unit buildings — mowing on schedule, trimming around posts and hydrants, edging the walks and refreshing mulch beds. Buildings with many doors need the grounds handled once and handled right, so nobody has to think about it. Spring cleanups clear the winter's grit and litter; fall cleanups take the leaves before they mat down on the turf. Riverside light, city ground, kept neat week after week.