"The applicant for preferential assessment hereby agrees, if his application is approved for preferential assessment, to submit thirty days'-notice to the county assessor of a proposed change in use of the land, a change in ownership of a portion of the land or of any type of division or conveyance of the land. The applicant for preferential assessment hereby acknowledges that, if his application is approved for preferential assessment, roll-back taxes under section 5.1 of the act may be due for a change in use of the land, a change in ownership of any portion of the land, or any type of division or conveyance of the land."
72 P.S. § 5490.4