Whenever the ownership of any land acquired under this Act is transferred to any person for a consideration, without any development having taken place on such land, forty per cent. of the appreciated land value shall be shared amongst the persons from whom the lands were acquired or their heirs, in proportion to the value at which the lands were acquired within a period of five years from the date of acquisition:

   Provided that benefit shall accrue only on the first sale or transfer that occurs after the conclusion of the acquisition proceedings.