Exhibit (a)(25)
                           OFFER TO PURCHASE FOR CASH

                     All Outstanding Shares of Common Stock
                                       of
               PUTNAM CALIFORNIA INVESTMENT GRADE MUNICIPAL TRUST
                                       at
                              $14.75 Net Per Share
                                       by
                            MILDRED B. HOREJSI TRUST


    THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 5:30 PM, EASTERN STANDARD
              TIME, ON MARCH 8, 2007, UNLESS THE OFFER IS EXTENDED.

                                                               February 16, 2007

To Our Clients:

     Enclosed for your  consideration  is a Supplement  to the Offer to Purchase
dated February 16, 2007, and a related  letter of transmittal  (which,  together
with any amendments or supplements thereto, collectively constitute the "Offer")
relating to the Offer by the Mildred B. Horejsi Trust,  an  irrevocable  grantor
trust  administered  in  accordance  with  Alaska  administrative  statutes  and
governed by Alaska trust law (the "Trust") to purchase all outstanding shares of
common stock,  par value $0.001 per share (the "shares"),  of Putnam  California
Investment Grade Municipal Trust, a Massachusetts business trust ("PCA"), on the
terms and subject to the conditions set forth in the Offer.

     We are the holder of record of shares held by us for your account. A tender
of those  shares can be made only by us as the holder of record and  pursuant to
your  instructions.  The  letter of  transmittal  is  furnished  to you for your
information  only  and  cannot  be used to  tender  shares  held by us for  your
account.

     We request  instructions as to whether you wish to tender any or all of the
shares  held by us for your  account  pursuant  to the terms and  subject to the
conditions set forth in the Offer.

     Your attention is directed to the following:

          1.   The Offer price is $14.75 per share,  net to you in cash (subject
               to applicable  withholding  of United States  federal,  state and
               local taxes),  without interest thereon, on the terms and subject
               to the conditions set forth in the Offer.  This is  approximately
               99% of the net asset value,  per share, of PCA as of the close of
               trading on February 15, 2007.  The Offer is being made for all of
               the outstanding shares of PCA.

          2.   The  Offer  is  conditioned  upon  the  conditions  to the  Offer
               described  in  Section  14 of  the  Offer  to  Purchase  and  the
               Supplement dated February 9, 2007.  Please note that one of these
               conditions  requires  that shares  accepted for purchase that are
               tendered by  shareholders  holding shares as of February 15, 2007
               must be accompanied by a valid  irrevocable  legal proxy to votes
               such shares. Pursuant to your instruction, we will deliver to the
               depository  a legal  proxy to vote such  tendered  shares on your
               behalf.

          3.   Tendering  stockholders  will not be obligated  to pay  brokerage
               fees or commissions to the  depositary or the  information  agent
               or,  except  as set  forth  in  Instruction  6 of the  letter  of
               transmittal,  transfer  taxes on the  purchase  of  shares by the
               Purchasers  pursuant to the Offer.  However,  federal  income tax
               backup  withholding  at a rate of 28% may be required,  unless an
               exemption   is   provided   or  unless  the   required   taxpayer
               identification  information is provided. See Instruction 9 of the
               letter of transmittal.

     If you wish to have us tender any of or all the shares  held by us for your
account, please so instruct us by completing, executing, detaching and returning
to us the  instruction  form  set  forth  below.  An  envelope  to  return  your
instructions to us is enclosed.  If you authorize the tender of your shares, all
such  shares  will  be  tendered  unless  you  otherwise   specify  below.  Your
instructions to us should be forwarded  promptly to permit us to submit a tender
on your behalf prior to the expiration date.


     In all cases, payment for shares accepted for payment pursuant to the Offer
will be made only after timely receipt by Colbent Corporation (the "depositary")
of (1) the certificates for (or a timely book-entry  confirmation (as defined in
the Offer to Purchase) with respect to) such shares, (2) a letter of transmittal
(or a  facsimile  thereof),  properly  completed  and  duly  executed,  with any
required signature guarantees, or, in the case of a book-entry transfer effected
pursuant to the procedures  set forth in Section 3 of the Offer to Purchase,  an
agent's  message  (as  defined  in the  Offer to  Purchase),  and (3) any  other
documents  required  by  the  letter  of  transmittal.   Accordingly,  tendering
stockholders  may be paid at different times depending on when  certificates for
shares or book-entry  confirmations with respect to shares are actually received
by the depositary.

     UNDER NO  CIRCUMSTANCES  WILL INTEREST BE PAID ON THE PURCHASE PRICE OF THE
SHARES TO BE PAID BY THE PURCHASERS, REGARDLESS OF ANY EXTENSION OF OR AMENDMENT
TO THE OFFER OR ANY DELAY IN PAYING FOR SUCH SHARES.

     The Offer is not being made to, nor will  tenders  be  accepted  from or on
behalf  of,  holders  of shares in any  jurisdiction  in which the making of the
Offer or the acceptance thereof would not be in compliance with the laws of that
jurisdiction.






                        INSTRUCTION FORM WITH RESPECT TO
                         THE OFFER TO PURCHASE FOR CASH
                     ALL OUTSTANDING SHARES OF COMMON STOCK
                                       OF
               PUTNAM CALIFORNIA INVESTMENT GRADE MUNICIPAL TRUST

     The undersigned  acknowledge(s)  receipt of your letter enclosing the Offer
to Purchase  dated  January 22,  2007,  as  amended,  and the related  letter of
transmittal, as amended relating to the Offer by the Mildred B. Horejsi Trust to
purchase up to 100% of the outstanding  shares of common stock, par value $0.001
per share (the "shares"), of Putnam California Investment Grade Municipal Trust,
a Massachusetts business trust.

     This will instruct you to tender the number of shares  indicated below held
by you for the account of the undersigned  (or, if no amount is indicated below,
all the shares held by you for the account of the  undersigned) on the terms and
subject to the  conditions  set forth in the Offer to  Purchase  and the related
letter of transmittal.


                                                  

Number of Shares to be Tendered*
                                                     _____________________________________________

_____________________________________________        _____________________________________________
   shares

                                                                Signatures

Dated: _________________________________, 2007       _____________________________________________

                                                     _____________________________________________

                                                     _____________________________________________
                                                                Please type or print name(s)

                                                     Address(es) (including Zip Code(s)):

                                                     _____________________________________________

                                                     _____________________________________________

                                                     _____________________________________________

                                                     _____________________________________________

                                                     _____________________________________________

                                                     Area Code and Telephone No.

                                                     _____________________________________________

                                                     Taxpayer Identification or Social Security No.:

                                                     _____________________________________________



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* Unless otherwise indicated, it will be assumed that all shares held by us for
your account are to be tendered.