Manager shall analyze all bills received for services, work and supplies in connection with maintaining and operating the Properties, pay all such bills when due, and, if requested by Owner, pay, when due, utility and water charges, sewer rent and assessments, and any other amount payable in respect to the Properties. All bills shall be paid by Manager within the time required to obtain discounts, if any. Owner may from time to time request that Manager forward certain bills to Owner promptly after receipt, and Manager shall comply with any such request. Manager shall pay all bills, assessments, real property taxes, insurance premiums and any other amount payable in respect to the Properties out of the Account (as defined in Section 2.5 ). All expenses shall be billed at net cost ( i.e. , less all rebates, commissions, discounts and allowances, however designated).