Hazardous Materials. Tenant fails to perform or breaches any agreement or covenant to be performed or observed by Tenant under Paragraph 4.4 above and such failure or breach continues for more than ten (10) days after Landlord gives written notice thereof to Tenant; provided, however, that if, by the nature of such agreement or covenant, such failure or breach cannot reasonably be cured within such period of ten (10) days, an Event of Default shall not exist as long as Tenant commences the curing of such failure or breach within such period of ten (10) days and, having so commenced, thereafter prosecutes such cure with diligence and dispatch to completion as soon as may be reasonably practicable thereafter.

Other Covenants. Tenant fails to perform or breaches any agreement or covenant of this Lease to be performed or observed by Tenant (except for those described in [clauses (1) through (4) above]) as and when performance or observance is due and such failure or breach continues for more than thirty (30) days after Landlord gives written notice thereof to Tenant; provided, however, that if, by the nature of such agreement or covenant, such failure or breach cannot reasonably be cured within such period of thirty (30) days, an Event of Default shall not exist as long as Tenant commences with due diligence and dispatch the curing of such failure or breach within twenty (20) days after Landlord gives written notice thereof to Tenant and, having so commenced, thereafter prosecutes such cure with diligence and dispatch to completion as soon as may be reasonably practicable thereafter.