Partial Destruction If the Premises or the Building are damaged by fire or other casualty to an extent not exceeding twenty-five percent (25%) of the full replacement cost thereof, and Landlord's contractor reasonably estimates in a writing delivered to Landlord and Tenant that the damage thereto may be repaired, reconstructed or restored to substantially its condition immediately prior to such damage within one hundred eighty (180) days from the date of such casualty, and Landlord will receive insurance proceeds sufficient to cover the costs of such repairs, reconstruction and restoration (including proceeds from Tenant and/or Tenant's insurance which Tenant is required to deliver to Landlord pursuant to Subparagraph 20(e) below to cover Tenant's obligation for the costs of repair, reconstruction and restoration of any portion of the Tenant Improvements and any Alterations for which Tenant is responsible under this Lease), then Landlord agrees to commence and proceed diligently with the work of repair, reconstruction and restoration and this Lease will continue in full force and effect.