Well I can tell you this. about 8 years ago I had to go to Trenton N.J. on the way the warehouses being built and looking for renter was unreal. The warehouses where like 1/4 mile long by at least a 1/4 mile wide. For 15 miles nothing but warehouses. Some were longer. But I can tell you the Sq. Ft. was up there around 500 to 700 Thousand sq/ft from the bill boards. I'm a builder so I took a good look and couldn't believe what I was seeing. They are building bigger today.
Building 3001 at Tinker Air Force Base was constructed between 1941 and 1942 as the Douglas Assembly Building for the Douglas Cargo Aircraft Plant. It measures three-fourths mile long, 1,000 feet wide at its longest point, and 2.4 million square feet in total.Oct 9, 2015
Both my grandad and Father were brick layers on that building