(a) The legislative body of a county shall not adopt any resolution authorized by § 13-20-502, § 13-20-504 or § 13-20-505 unless a public hearing has first been held which shall conform, except as otherwise provided in this chapter, to the requirements of § 13-20-402 for hearings to determine the need for a housing authority of a city; provided, that such hearings may be held by the legislative body without a petition therefor. No housing authority shall constitute a body corporate and politic until the commissioners of such authority have filed and recorded an application with the secretary of state, which shall conform, insofar as possible, to §§ 13-20-403 and 13-20-404 for the making, filing and recording of an application to the secretary of state by the commissioners of a housing authority created for a city; provided, that any such application filed and recorded hereunder shall set forth that the public hearing or hearings, as required by this chapter, have been held.
(b) In connection with the issuance of bonds or the incurring of other obligations, a regional housing authority may covenant as to limitations on its right to adopt resolutions relating to the increase or decrease of its area of operation.