It shall be unlawful to use real property or the improvements on real property; to undertake the development of real property; to erect, construct, reconstruct, remodel, restore or improve a building or structure; to excavate land; or to alter or change the use of any real property or improvements on real property within the unincorporated territory of Pitkin County in a way inconsistent with or not in accordance with the adopted building code and without first obtaining a building permit in accordance with the provisions of this Land Use Code and the adopted building code as adopted by the Board.