The ombudsman shall adopt by regulation procurement procedures that are appropriate for the office of the ombudsman and that are similar to those adopted by the legislative council under AS 36.30.020, as they may be amended from time to time. The procedures shall be followed by the office of the ombudsman in contracting for professional and other services, supplies, and office space, and for construction limited to providing and maintaining office space for the office of the ombudsman. However, competitive principles in the procurement procedures adopted by the legislative council under AS 36.30.020 do not apply to contracts for investigations under AS 24.55.100.