Logistics warehouses have emerged as the battleground for e-commerce sites trying to lure customers with one-day delivery. Now Blackstone Group is betting big on logistics, paying $18.7 billion for 179 million square feet of warehouse spaces in urban areas around the country. The move makes Blackstone a major player in the warehouse space, doubling its logistics holdings. With more and more online retailers promising same-day delivery, the location of warehouses is becoming more important than ever.

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