Our society has dry terraces - washing spaces, which are on alternate sides for flats one above the other. As such each dry terrace has a ceiling double the height. Many residents are covering the open height space of the the flat below with grills or slabs thus creating extra useable storage space for their flats! this also blocks the light and air of the flat below. Other want to imitate this extra space availble to these people by taking up the lobby space for shoe closets. Is this correct ? To me it is encroaching common space What can be done to stop these people?