Following Tenant's receipt of a Statement, Tenant shall have the right by written notice to Landlord to commence and complete an audit of Landlord's books concerning the Direct Expenses for the Expense Year which are the subject to such Statement, within the later to occur of (x) six (6) months following the delivery of such Statement and (y) the date that is sixty (60) days after Landlord makes Landlord's books and records available for Tenant's audit, provided that Tenant notifies Landlord of Tenant's intent to audit Landlord's books and records within the six (6) month period described in clause (x) above (the " Audit Period "); notwithstanding the foregoing, on the first (1st) occasion within the initial three (3) years of the Lease Term on which Tenant exercises its right to audit Landlord's books and records concerning Direct Expenses pursuant to the provisions of this Section 4.6 , Tenant shall be entitled to audit Landlord's books and records concerning Direct Expenses for the Base Year as well as the books and records for the Expense Year which is the subject of the applicable Statement. Following the giving of such written notice, Tenant shall have the right during Landlord's regular business hours taking into account the workload of Landlord's employees involved in the audit at the time of the audit request and on reasonable prior notice, to audit, at Landlord's corporate offices, at Tenant's sole cost, Landlord's records, provided that Tenant is not then in Default. The audit of Landlord's records may be conducted only by a reputable certified public accountant, subject to Landlord's approval, which approval shall not be unreasonably withheld. Any accounting firm selected by Tenant in connection with the audit (i) shall be a reputable independent nationally or regionally recognized certified public accounting firm which has previous experience in auditing financial operating records of landlords of office buildings; (ii) shall not already be providing accounting and/or lease administration services to Tenant and shall not have provided accounting and/or lease administration services to Tenant in the past three (3) years; (iii) shall not be retained by Tenant on a contingency fee basis (i.e. Tenant must be billed based on the actual time and materials that are incurred by the accounting firm in the performance of the audit), a copy of the executed audit agreement, between Tenant and auditor, shall be provided to Landlord prior to the commencement of the audit; and (iv) at Landlord's option, both Tenant and its agent shall be required to execute a commercially reasonable confidentially agreement prepared by Landlord. Any audit report prepared by Tenant's auditors shall be delivered concurrently to Landlord and Tenant within the Audit Period. If, after such audit of Landlord's records, Tenant disputes the amount of Direct Expenses for the year under audit, Landlord and Tenant shall meet and attempt in good faith to resolve the dispute. If the parties are unable to resolve the dispute within sixty (60) days after completion of Tenant's audit, then , at Tenant's request, a certified public accounting firm selected by Landlord, and reasonably approved by Tenant, shall, at Tenant's cost, conduct an audit of the relevant Direct Expenses (the " Neutral Audit ") . Tenant shall pay all costs and expenses of the Neutral Audit unless the final determination in such Neutral Audit is that Landlord overstated Direct Expenses in the Statement for the year being audited by more than five percent (5%) in which case Landlord shall pay all costs and expenses of the Neutral Audit, as well as Tenant's reasonable out-of-pocket costs actually incurred by Tenant in the audit of Landlord's books and records. In any event, Landlord will reimburse or provide a credit for any overstatement of Direct Expenses and Tenant shall pay to Landlord any understatement of Direct Expenses. If the Direct Expenses for the Base Year are adjusted as a result of such Neutral Audit , then any such change in the Direct Expenses for the Base Year shall be included in the foregoing calculation to determine if the Direct Expenses were overstated by more than five percent (5%). To the extent Landlord and Tenant fail to otherwise reach mutual agreement regarding Direct Expenses, the foregoing audit and Neutral Audit procedures shall be the sole methods to be used by Tenant to dispute the amount of any Direct Expenses payable by Tenant pursuant to the terms of the Lease.