What (a)(i) are the full details and (ii) is the total number of (aa) business, (bb) residential and (cc) farm properties of his department that remain unoccupied and/or without any lease agreement, (b) total amount is his department losing in revenue as a result, (c) are the costs of rates and taxes that his department is paying whilst each specified property is unoccupied and (d) plans are in place to have the properties operational?