A buffer of undisturbed area of not less than 25 feet in width maintained along all property lines and street rights-of-way to provide a buffer and shall not be used for parking, storage, or any other purpose except landscaping and crossing of access streets. In determining the type and extent of the buffer required, the Borough shall take into consideration the design of the project structure(s) and site, topographical features which may provide natural buffering, existing natural vegetation, and the relationship of the proposed project to adjoining areas.