All structures, landscaping and paving on a lot on which an accessory apartment is located shall be maintained in a neat and clean manner, including but not limited to driveways, walkways, sidewalks adjoining the subject parcel, exterior shingles, paint, shutters and trim, as well as landscaping, lawns and shrubbery. The Town or its designee reserves the right to enter onto the subject property after 15 days' written notice by certified mail, return receipt requested, to the then owner to its address as it appears on the assessment roll, to remove littered debris or to maintain or replace any fencing or planting if found that the improvements are not being maintained, and shall bill the owner for any expense incurred.