Within the South Street Seaport Subdistrict, at the time of transfer of development rights from a granting lot, there shall be recorded in the Office of the Register of the City of New York, and indexed against such granting lot from which floor area is removed, an instrument removing such floor area and prohibiting construction on such zoning lot of any building or other structure which would contain floor area in excess of that still available to the zoning lot after deducting the floor area removed, such prohibition to be non-cancelable for 99 years; and at the time of the addition of development rights to a receiving lot as provided in Section 91-65, there shall be recorded in the Office of the Register of the City of New York, and indexed against such receiving lot to which floor area is added, an instrument transferring the floor area to the receiving lot benefited and identifying the granting lot (by tax block and lot number and description) from which the floor area has been removed. A certified copy of such instruments shall be submitted to the City Planning Commission upon recordation.