(a) In addition to the amount otherwise payable pursuant to Section 24202.5, 24203, 24203.5, 24205, 24209, 24209.3, 24210, 24211, 24212, or 24213, a member shall receive an increase in the monthly allowance, prior to any modification pursuant to Sections 24300, 24300.1, and 24309, in the amount identified in subdivision (b), if the member meets all of the following criteria:

1. (1) The member retires for service on or after January 1, 2001.

2. (2) Prior to January 1, 2011, the member has 30 or more years of credited service, including any credited service that a court has ordered be awarded to a nonmember spouse pursuant to Section 22652, but excluding service credited pursuant to the following:

   1. (A) Section 22714.
   2. (B) Section 22715.
   3. (C) Section 22717, except as provided in subdivision (c) of Section 22121.
   4. (D) Section 22717.5.
   5. (E) Section 22826.
3. (3) The member is receiving an allowance subject to Section 24203.5.

(b) The amount of the increase in the monthly allowance shall be based on the member’s years of credited service at the time of retirement as follows:

(c) This section also applies to a nonmember spouse, if all of the following conditions are satisfied:

1. (1) The member is eligible for the allowance increase pursuant to subdivisions (a) and (b) upon his or her retirement for service.

2. (2) On the date the parties separated, as established in the judgment or court order pursuant to Section 22652, the member had at least 30 years of credited service, excluding service credited pursuant to the following:

   1. (A) Section 22714.
   2. (B) Section 22715.
   3. (C) Section 22717, except as provided in subdivision (c) of Section 22121.
   4. (D) Section 22717.5.
   5. (E) Section 22826.
3. (3) The service credit of the member was divided into separate accounts in the name of the member and the nonmember spouse by a court pursuant to Section 22652. The amount identified in the schedule in subdivision (b) and payable pursuant to this section, that is based on the service credited during the marriage, shall be divided and paid to the member and the nonmember spouse proportionately according to the respective percentages of the member’s service credit that were allocated to the member and the nonmember spouse in the court’s order.