Ind. Code § 36-1-12-3.5
When any public work is proposed to be performed and the board determines by a two-thirds (2/3) vote that it is expedient and in the best public interest to employ professional engineering, architectural, or accounting services for the planning and financing of the public work and the preparation of plans and specifications, then the limitations and restrictions in the general statutes with respect to invalidity of contracts without an appropriation therefor, payment of fees solely from the proceeds of bonds or assessments when and if issued, and payment of fees solely from a special fund or funds to be provided in the future, do not apply to contracts for those professional services to the extent that such limitations and restrictions might otherwise prevent the payment of fees for services actually rendered in connection with those contracts or affect the obligation to pay those fees.
IC 36-1-12-3.5