Modelur is a parametric Urban Design tool seamlessly integrated into SketchUp. It helps you quickly create and test different urban design alternatives. In addition to real-time calculation of key urban parameters (eg. FAR, number of apartments, required parking spaces, etc.) it also offers interactive 3D zoning, including warnings when the design is not in line with zoning regulations (eg. buildings are too high or if they are placed too close together, etc.).