(a) In a contract for an amount less than $2,500, when determined necessary by the Director, Regional Office, the contracting officer may include the following:

The contractor expressly waives any and all rights to file or maintain any mechanics lien or claim against the aforesaid premises.

(b) In a contract for $2,500 or more when there is doubt that the final responsibility of the contractor will provide maximum protection to the Government, the contracting officer must include any requirements that are available under local law. The contracting officer must obtain advice and approval of any contract stipulation or legal stipulations against liens from the District Counsel.