Offering customers free same-day delivery has long been an elusive goal for e-tailers. Their motivation is simple: If e-tailers can give customers the near-instant gratification of buying in a store, they can eliminate one of the most powerful advantages held by their bricks-and-mortar competitors. Alas, costs and complexity have largely kept same-day delivery (defined here as delivery between sunup and sundown on a weekday) out of reach and, at best, a niche offering.

Retailers will drive demand for up to 270 million square feet of warehouse space in Europe, including 33 million square feet for e-commerce, according to a report by Jones Lang LaSalle.