I'm not saying these buildings are "cheap". Just objectively, it's much cheaper to transform a "giant aircraft hangar" (which sounds awful, BTW) into open floor working spaces, than to use the same space to build and design individual offices for everyone. I'm not a civil engineer, but the windows, walls, ventilation, cabling, cooling/heating, etc., is surely much more expensive for individual offices than what open spaces in a "hangar" would require. The cost of interior design would be substantially lower as well. How could this be 3x the price per square foot of private office space? Was this some expensive military property?