(a) Initial endorsement. The Commissioner shall indicate his or her insurance of the mortgage by endorsing the original credit instrument.

(b) Final endorsement. When all advances of mortgage proceeds have been made and all other applicable terms and conditions have been complied with to the satisfaction of the Commissioner, the Commissioner shall indicate on the original credit instrument the total of all advances that have been approved for insurance and again endorse such instrument.

(c) Effect of endorsement. From the date of initial endorsement, the Commissioner and the HFA shall be bound by the provisions of this subpart to the same extent as if they had executed a contract including the provisions of this subpart and the applicable sections of the Act.