Union Center (SD) warehouse distribution buildings can be essential components of the supply chain, ensuring the distribution of goods on time, as well as the efficient management, storage, and handling of inventories. Union Center (SD) buildings can be classified into four types: 1) low activity/low storage for simple, smaller warehouse operation; 2) low activity/high storage Requirements for high bay, multi-level, high-density storage in Union Center (SD); 3) high activity/low storage for forward picking, simple overstock storage; and 4) high activity/high storage for large distribution.