With its unique design that works like sectional track, this Cornerstone kit makes it easy to build a detailed parking lot big or small on your HO layout. Molded cut lines on the back simplify cutting and fitting if needed, and separate gutters, entrance ramp and corner pieces are provided for the finishing touch. The realistic concrete color and surface can be used with Cornerstone Street System sets (each sold separately), and these parts are identical to the Parking Lot sections included with the Modern Travel Center (933-3538), Modern Gas Station (933-3537), and can also be used with the Modern Gas Station Car Wash (933-3539), each sold separately) for easy expansion.