California Code, Corporations Code - CORP § 15911.24

(a) If the limited partnership and the dissenting limited partner agree that such limited partner's interest is a dissenting interest and agree upon the price to be paid for the dissenting interest, the dissenting limited partner is entitled to the agreed price with interest thereon at the legal rate on judgments from the date of consummation of the reorganization.  All agreements fixing the fair market value of any dissenting limited partner's interest as between the limited partnership and such limited partner shall be in writing and filed in the records of the limited partnership.

(b) Subject to the provisions of Section 15911.27, payment of the fair market value for a dissenting interest shall be made within 30 days after the amount thereof has been agreed to or within 30 days after any statutory or contractual conditions to the reorganization are satisfied, whichever is later, and in the case of dissenting interests evidenced by certificates of interest, subject to surrender of such certificates of interest, unless provided otherwise by agreement.