To the extent that alterations or modifications to the Building exterior, path of travel outside the Building or Building access existing as of the date of the Fourth Amendment (collectively, “ Triggered Improvements ”) are triggered by Tenant’s performance of the Fourth Amendment Tenant Improvements, the cost of the Triggered Improvements shall be paid for by Landlord as part of Expenses under the Lease, and Tenant shall be required to pay its pro rata share of the cost of the Triggered Improvements on a monthly basis (on the same day that Monthly Base Rent is due) over the remaining balance of the Term.