Notwithstanding Section 6704, with respect to any kelp lease in effect on January 1, 1983, the lessee shall have a prior right to renew the lease on terms agreed upon between the commission and the lessee. If the lessee does not renew the lease, or if terms are not agreed upon, the commission shall advertise for bids on the individual kelp beds comprising the lease. The term of any renewal of a lease shall not exceed 20 years. Any lease in effect on January 1, 1985, may be performed pursuant to its terms, notwithstanding this article, but any renewal of that lease is subject to this article.