According to the Fall 2013 “Big Box Velocity Index” from Jones Lang LaSalle, even though just 5.5% of current retail sales are online, fully 12% of the U.S. requirements for warehouse space are eCommerce related. The reason? eCommerce fulfillment is increasingly moving to a one-day and same-day delivery model. So companies, like Amazon, have to increase the number of distribution centers to get physically closer customers.