Borrower shall pay and discharge all lawful claims, including Taxes, assessments, and governmental charges or levies imposed upon it or its income or profits or upon any properties belonging to it prior to the date upon which penalties attach thereto; provided that Borrower shall not be required to pay any such Tax, assessment, charge, or levy, the payment of which is being contested in good faith and by proper proceedings so long as proceedings for collection thereof have been stayed and the obligation to pay is secured by the posting of a bond or other legally sufficient security.