Borrower will promptly pay or cause to be paid when due (for the account of Bank, where appropriate) any and all Taxes due by Borrower, including, without limitation, all taxes, duties, fees, levies and other charges of whatsoever nature which have been or may be imposed by any government or by any department, agency, state, other political subdivision or taxing authority thereof or therein; provided that Borrower shall not be required to pay and discharge any such Taxes or charges so long as the validity thereof shall be contested in good faith by appropriate proceedings and Borrower shall set aside on its books adequate reserves with respect thereto and shall pay any such Taxes or charge before the property subject thereto shall be sold to satisfy any lien which has attached as security therefor.