The size of project is a measure to concentrate of families, Newman reached to this result that the more concentration, the more insulation of residences from the whole of community. The size of residential complex has a direct relationship with the amount of crimes in it. A large project create a continuous area that even a gang of drug sellers can polluted all of the common areas. The rate of sharing in entries of buildings, elevators and common stairs is an important factor. More people who are sharing in common areas, the more difficulties will be appeared. The main problem is in recognizing residences from offenders and there are more difficulties for residences to corporate with the rest of residence on the care and control of these areas