Repair and Maintenance Except for Landlord's obligation under Section 5.1.4, Tenant shall, during the term of this Lease, maintain the Premises in neat and clean order and condition, contract for daily cleaning and routine pest control services for the Premises, and perform all repairs to the Premises and all fixtures, systems, and equipment therein (including Tenant's equipment and other personal property) as are necessary to keep them in good and clean working order, appearance and condition and consistent with other premises in first-class buildings used for the Permitted Uses, reasonable use and wear thereof and damage by fire or by unavoidable casualty only excepted and shall replace any damaged or broken glass in windows and doors of the Premises (except glass in the exterior walls of the Building) with glass of the same quality as that damaged or broken. Tenant shall secure and pay for, keep in full force and effect and enforce, contracts with appropriate and reputable service providers (such contracts and providers to be approved in advance by Landlord) providing for regular maintenance of any ventilating and air-conditioning systems or components servicing the Premises exclusively and copies of such contracts and service call requests and invoices shall be furnished to Landlord upon request. Tenant shall keep any garbage, trash, rubbish or other refuse in vermin-proof containers within the interior of the Premises until removed, and shall dispose of such refuse in properly sealed bags placed in dumpsters provided and emptied by Tenant's trash removal contractor at Tenant's sole expense. Landlord shall have no obligation to collect or dispose of any (a) radioactive, volatile, highly flammable, explosive of toxic materials, (b) needles, syringes, lancets, similar sharp objects or contaminated wares, (c) human or animal tissue or products, or (d) any other Hazardous Materials, any item identified in clauses (a) through (d), above, hereinafter referred to as "Excepted Waste". Tenant agrees that title to and liability for any Excepted Waste from the Premises shall remain with Tenant, even if Landlord collects and/or disposes of any such Excepted Waste.