In this article, "structure" means a combination of material to form a construction that is stable; including, among other things, buildings, stadiums, reviewing stands, platforms, stagings, observation towers, radio towers, water tanks and towers, trestles, piers, paving, bulkheads, wharves, sheds, coal bins, shelters, fences and display signs visible or intended to be visible from a public way. The term also includes natural land formations and appurtenances and environmental settings. The term shall be construed as if followed by the words "or part thereof." "Appurtenances" and "'environmental settings" include walkways and driveways (whether paved or not), trees, landscaping, pastures, croplands, waterways and rocks. In this article, "demolition" includes any willful neglect in maintenance and repair of a structure, not including any appurtenances and environmental settings, held or used in a trade or business or for the production of income, that does not result from financial inability to maintain and repair the structure and that threatens to result in any substantial deterioration of the exterior features of the structure.