A Cambridge storm is measured in sidewalks. Brick walks buckled by roots, granite steps, narrow alley entrances, the strip between a triple-decker's front door and the street — all of it has to be open while the Charles goes gray and the plows push the avenues into ridges. MassLandlords, Inc. does the snow and ice clearing for that landscape: shoveling and plowing what can be reached, cutting through the plow ridge at the curb, treating the steps and walks where meltwater runs and refreezes. Squares like Central and Inman never actually go quiet, so the work happens around people, in the dark, and finishes before the first commute. Clear passage is the whole promise.