Common Elements are stairways and platforms, corridors and walkways, as well as grounds and systems. Rules and regulations in Schedule A of the By-Laws states: “No clothes, sheets, blankets, laundry, advertising, political signs or any other articles shall be hung out of a unit, or exposed on any part of the Common Elements. The Common Elements shall be kept free and clear of rubbish, debris and other unsightly materials. No bicycles, carriages, toys, or any other item shall be placed, or left in the walkways and stair platforms, corridors, or other Common Elements.”