Letter of Credit Tenant has deposited, and shall maintain on deposit with Landlord at all times during the initial Term of this Lease, one or more unconditional, irrevocable letter(s) of credit (each a "Deposit L/C") in the "Required Amount" (as hereinafter defined), as security for the full and prompt payment, performance and observance by Tenant of all of the covenants and obligations to be paid, performed and/or observed on the part of Tenant under this Lease and for the payment of any and all damages for which Tenant, shall be final by reason of any act or omission contrary to any of the provisions of this Lease. Each Deposit L/C shall be issued by a bank reasonably acceptable to Landlord and shall be substantially in the form of the letter of credit attached hereto on Exhibit D and made a part hereof. If any Deposit L/C provides that the amount drawable thereunder shall cease to be available on a date prior to the date which is thirty (30) days after the expiration of the fourth (4th) Lease Year, or if the issuing bank shall give written notice to Landlord that it will not extend such Deposit L/C for an additional twelve (12) months beyond the then current expiry date, Tenant shall, at least thirty (30) days prior to the date specified in such Deposit L/C as being the date on which such drawable amount will cease to be available, or the then current expiry date, as the case may be, either furnish to Landlord a renewal or extension of such Deposit L/C or a new Deposit L/C. Failure to comply with the provisions of the preceding sentence prior to the commencement of said thirty (30) day period shall be deemed to be a default under this Lease and Landlord may, at any time during said thirty (30) day period, draw upon such Deposit L/C and retain as a security deposit hereunder the amount so drawn. As used herein, the term "