Twenty One Industrial Estate in Clayville features a secure, access controlled park in Olifantsfontein just off the R21 Freeway featuriing warehouses and factories to let. Units range in size from 500m² to 20 000m² and are built to modern design and safety specifications. The park is situates along the R21 corridor which provides crucial access and linkage between OR Tambo and Johannesburg and Pretoria. Users in the park include blue chip comapnies like RTT, Sany and