Up to 50% of the height of an existing tower may be replaced with no increase in height as part of modifications made to provide for co-location of a new facility. Replacement of more than 50% shall be considered as a new tower and shall meet all of the applicable requirements. 4.1.7.2 Rebuilding damaged or destroyed existing site Existing towers and facilities that are damaged or destroyed may be rebuilt through administrative review and approval, provided the replacement tower or facility is the same as the original in type, location and capacity or brings a previously nonconforming tower or facility into greater conformance and no more than 50% of the tower or facility is involved. If more than 50% of the tower or facility is involved, it shall be considered as a new facility that shall meet all of the applicable requirements. A damaged or destroyed tower not rebuilt in 180 days shall be considered abandoned. 4.1.8 Removal of abandoned or unusable facility In the event the use of a tower is discontinued by the tower owner, or in the event a tower owner files notice to RURA of its interest to cease operating, the tower owner shall provide written notice of its intent to discontinue use and the date when the use shall be discontinued. 4.1.8.1 Any facility deemed abandoned pursuant to these guidelines or any facility that is not operated for a continuous period of twelve months shall be considered abandoned, and the owner or last operator shall remove it within ninety days of receipt of written notice to remove from RURA. Failure to remove an abandoned tower or facility within ninety days shall be grounds to remove it at the owner’s or last operator’s expense. If there are two or more users of a single tower or facility, then this provision shall not become effective until all users cease using it. 4.1.9 Non-conforming structures After coming into force of these guidelines, any wireless communication facilities, which have been located, constructed or modified without first obtaining the required permit or any necessary authorization, shall be ordered to be removed. 7