Our manufacturing facility is in an old roofing tile manufacturing facility, originally built around the 1890's. The entire property is riddled with brick lined tunnels. We are interested in adding a free standing metal building appxly 50' x 100' x 16' eaves. Current building design calls for concrete column footings buried 3'-5' deep. This would require a caving in and compacting procedure that would be quite expensive. Does any one know if such a building can be built entirely above ground? All ideas, comments, and suggestions will be greatly appreciated. Thanks, K.