Apple has started construction of two massive buildings that will eventually house its next major datacenter, located in Prineville, Oregon. Following on from the company's first large-scale facility in Maiden, North Carolina, the development will eventually house two buildings of approximately 338,000 square feet -- each about the size of two Costco stores, reports The Oregonian. Together, about 500,000 square feet of the total will be devoted to data halls. The first building alone will cost some $68 million.