Neither the provisions of this article nor any rules and regulations promulgated pursuant to section three of this article shall be construed or interpreted so as to create any element of value or damage not in existence prior to the effective date of this article in any condemnation proceedings brought under the power of eminent domain exercised by any state agency except to the extent, if any, required by applicable law of the United States; but, notwithstanding any other provision of law, whenever an acquiring agency in a condemnation proceeding pays a sum into court as representing the fair market value of property to be acquired, the amount of the award or verdict pertaining to such property shall not be less than such sum.
Any acquiring agency may provide assistance as contemplated in such federal act even though the dislocation or acquisition occasioning the same occurred prior to the effective date of this article if federal funds are available for the payment of any such assistance.