If in any fiscal year the gross receipts of a housing corporation from any project shall exceed an amount sufficient to meet the charges with reference to that project specified in Section 30 of this Act, the balance shall be applied to the pro rata reduction of rentals of housing accommodations in the project, unless the directors of the corporation with the approval of the Illinois Housing Development Authority shall deem such balance too small for effective application to that purpose.
310 ILCS 5/35