C. Any landowner who has prior to July 1, 1990, proffered the dedication of real property of substantial value or construction of substantial public improvements, the need for which is not generated solely by the rezoning itself, but who has not substantially implemented such proffers prior to July 1, 1990, shall advise the local governing body by certified mail prior to July 1, 1991, that he intends to proceed with the implementation of such proffers. The notice shall identify the property to be developed, the zoning district, and the proffers applicable thereto. Thereafter, any landowner giving such notice shall have until July 1, 1995, substantially to implement the proffers, or such later time as the governing body may allow. Thereafter, the landowner in good faith shall diligently pursue the completion of the development of the property. Any landowner who complies with the requirements of this subsection shall be entitled to the protection against action initiated by the governing body affecting use, floor area ratio, and density set out in subsection B, unless there has been mistake, fraud, or a change in circumstances substantially affecting the public health, safety, or welfare, but any landowner failing to comply with the requirements of this subsection shall acquire no rights pursuant to this section.