(a) Cities, towns or villages with approved LWRPs on the effective date of this Part may develop and submit an HMP for review and approval. However, any city, town or village which seeks to amend an approved LWRP must include a HMP for approval in any such amendment. This requirement may be waived by the secretary to the extent commensurate with the particular circumstances of the local government proposing the LWRP amendment.

(b) Cities, towns or villages which have completed the review period provided in section 601.4(b) of this Title before July 1, 1994 shall not be required to submit an HMP as a precondition to approval of an LWRP.