(a) The establishment and organization of housing authorities pursuant to the provisions of this subchapter, together with all proceedings, acts, and things heretofore undertaken, performed, or done with reference thereto, are validated, ratified, confirmed, approved, and declared legal in all respects, notwithstanding any defect or irregularity in them or any want of statutory authority.

(b) All contracts, agreements, obligations, and undertakings of housing authorities heretofore entered into relating to financing or aiding in the development, construction, maintenance, or operation of any housing projects or to obtaining aid for them from the United States, including without limiting the generality of the foregoing, loan and annual contributions contracts, leases with the United States, agreements with municipalities, counties, or other public bodies, including agreements which are pledged or authorized to be pledged for the protection of the holders of any notes or bonds issued by authorities or which are otherwise made a part of the contract with the holders of notes or bonds, relating to cooperation and contributions in aid of projects, payments, if any, in lieu of taxes, furnishing of services and facilities, and the elimination of unsafe and insanitary dwellings, and contracts for the construction of housing projects, together with all proceedings, acts, and things heretofore undertaken, performed, or done with reference to them, are validated, ratified, confirmed, approved, and declared legal in all respects, notwithstanding any defect or irregularity in them or any want of statutory authority.

(c) All proceedings, acts, and things heretofore undertaken, performed, or done in or for the authorization, issuance, sale, execution, and delivery of notes and bonds by housing authorities for the purpose of financing or aiding in the development or construction of housing projects, and all notes and bonds heretofore issued by authorities, are validated, ratified, confirmed, approved, and declared legal in all respects, notwithstanding any defect or irregularity in them or any want of statutory authority.