The raised center aisles look like they would make a nice apartment area. Can this be done?
Yes and NO! BR can design and engineer 2 story structures, that is, lofts over the aisle. The space above the aisle is designed for light and ventilation so special engineering would be required at an extra cost. It is possible for a secondary contractor to finish off an apartment in a special area that has been provided for, in the barn. This has been done and very successfully. However, this must be done after the fact, by others.