Physical Collocation (a) If space for Physical Collocation is immediately available at the time of Requesting Carrier’s Collo Order, Ameritech shall include in its Collo Response to Requesting Carrier notice of such immediate availability. (b) If Requesting Carrier’s requested Physical Collocation space is available, Ameritech and Requesting Carrier shall have an initial walk-through of such space within the interval specified in the Implementation Plan. Absent Ameritech’s written consent, Requesting Carrier must have at least one (1) authorized employee (i.e., in addition to any authorized vendor) at such walk- through. If during the initial walk-through, Requesting Carrier wishes to modify or change its Collo Request, Requesting Carrier must sign or initial any such modifications or changes and provide Ameritech a change order reflecting same within five (5) Business Days of such initial walk-through. If a change or modification is noted at the initial walk-through, Ameritech shall have no obligation to commence work on Requesting Carrier’s Collocation space until it receives a change order to amend the Collo Request or written confirmation that Requesting Carrier does not wish to pursue such change or modification. Failure to provide Ameritech the change order or written confirmation within the foregoing five (5) Business Day period shall be deemed a Requesting Carrier Delaying Event for the period between the expiration of such five (5) day period and the date of actual receipt by Ameritech. (c) Ameritech shall deliver to Requesting Carrier the requested space on or before the later of (i) one hundred twenty (120) days from Ameritech’s receipt of Requesting Carrier’s Collo Order, (ii) ninety (90) days from the date of the initial walk-through and (iii) such other reasonable date that the Parties may agree upon if it is not feasible for Ameritech to deliver to Requesting Carrier such space within the foregoing intervals (such date of delivery referred to as the “Delivery Date”). (d) Physical Collocation space ordered by Requesting Carrier will be made available to Requesting Carrier by Ameritech as more fully described in Section 1 of Schedule 12.12. (e) Ameritech may begin billing recurring charges for the Collocated space on the date such space is made available for occupancy (the “Occupancy Date”). Requesting Carrier shall vacate the Collocated space if either (i) Requesting Carrier (or one of its Resident Collocators, if applicable) fails to install within ninety (90) days of the Occupancy Date the equipment necessary for Interconnection with Ameritech and/or access to Ameritech’s unbundled Network Elements to be housed in such space or (ii) Requesting Carrier (or one of its Resident Collocators, if applicable) fails to Interconnect to the Ameritech network within one hundred fifty (150) days of the Occupancy Date. If Requesting Carrier is required to vacate the space pursuant to this Section 12.12.2(e), Requesting Carrier (and its Resident Collocators) shall vacate such space within ninety (90) Business Days of the earliest to occur of the foregoing events. If, after vacating a space, Requesting Carrier still requires Collocation in that Premises, Requesting Carrier shall be required to submit a new request for Collocation pursuant to the provisions of Section 12.12.1. (f) Physical Collocation will be subject to the additional rules and regulations set forth in Section 2.0 of Schedule 12.12. (g) At Requesting Carrier’s request Ameritech shall provide for APCS within three