(a) A municipality or Municipal Urban Renewal Agency shall give prompt notice of the commencement of any litigation of any nature against the municipality or agency affecting an urban renewal, community renewal or concentrated code enforcement program to the commissioner by the transmittal of a copy of each document and pleadings, as well as a statement of all pertinent information. A duplicate copy of every communication and enclosures to and from general counsel, HUD, shall be sent to the commissioner.

(b) When in connection with any action or proceeding a written notice is required to be served upon the municipality or Municipal Urban Renewal Agency, by instrument or law, before commencement of an action or proceeding, there shall be transmitted to the commissioner a copy of such written notice within five days after the service thereof.