Any person, agency or other entity acquiring real property for such use shall as soon as practicable after the date of payment of the purchase price or the date of deposit into court of funds to satisfy the award of compensation in a condemnation proceeding to acquire real property, whichever is the earlier, reimburse the owner, to the extent that the state deems fair and reasonable, for expenses he necessarily incurred for (a) recording fees, transfer taxes and similar expenses incidental to conveying such real property to the state; (b) penalty costs for prepayment for any preexisting recorded mortgage entered into in good faith encumbering such real property; and (c) the pro rata portion of real property taxes paid which are allocable to a period subsequent to the date of vesting title in the state, or the effective date of possession of such real property by the state, whichever is the earlier.