Any bills, statements, notices, demands, requests, consents or other communications given or required to be given under this Consent shall be effective only if rendered or given in writing and (i) delivered personally (against a signed receipt), (ii) sent by mail (registered or certified, return receipt requested), or (iii) sent by a nationally recognized overnight courier; delivered to the respective party at the address hereinabove set forth or at such other address for such purpose by notice in accordance with the provisions hereof; or, if addressed to Tenant or Subtenant, at the Building.  Any such bills, statements, notices, demands, requests, consents or other communications shall be deemed to have been rendered or given (x) on the date delivered, if delivered personally, or (y) three (3) business days after the date mailed, if mailed, or (z) on the first (1 st ) business day after the date sent by a nationally recognized overnight courier, if sent by a nationally recognized overnight courier.