Exhibit (a)(3)






November 16, 2007



TO:        SHAREHOLDERS OF BANK BUILDING CORPORATION

SUBJECT:   OFFER TO PURCHASE SHARES

Dear Shareholder:

As described in the enclosed Offer to Purchase and related Letters of
Transmittal (the "Offer") the Purchasers named in the attached Offer
(collectively the "Purchasers") are offering to purchase up to 79,649 Shares of
common stock (the "Shares") in BANK BUILDING CORPORATION (the "Corporation") at
a purchase price equal to:

                                  $5 per Share
                                  ------------

The Offer will provide you with an opportunity to liquidate all, or a portion
of, your investment in BANK BUILDING CORPORATION without the usual transaction
costs associated with market sales or transfer fees. Reasons you may wish to
sell your Shares include:

     o    EQUAL TO HIGHEST  OFFER PRICE  KNOWN.  Our offer is equal to the price
          paid by the Corporation's  Secretary and Treasurer,  Jane Ann Davis on
          September  21,  2007,  as  reported  on Form 4 filed on EDGAR.  We are
          unaware of any other trading prices.

     o    ABSENCE OF DIVIDENDS.  According to the Corporation,  "The Corporation
          has not paid dividends  since its  incorporation  and no dividends are
          anticipated in the  foreseeable  future."  (Annual Report on Form 10-K
          for the fiscal year ended December 31, 2006).

     o    INFINITE  LIFE  OF  CORPORATION.  Our  offer  provides  you  with  the
          opportunity  to receive a  guaranteed  amount of money in a  specified
          time period. The Corporation's life is infinite,  so investors may not
          see liquidity for some time.

     o    ILLIQUIDITY OF SHARES.  The Corporation has stated that  "[m]anagement
          believes that the  consideration for any shares of stock that may have
          been traded in recent years has been minimal."  (Annual Report on Form
          10-K for the fiscal year ended December 31, 2006).

After carefully reading the enclosed Offer, if you elect to tender your Shares,
mail (using the enclosed pre-addressed, postage paid envelope) or fax (then
mail) a duly completed and executed copy of the Letter of Transmittal (printed
on blue paper) and change of address forms, and any other documents required by
the Letter of Transmittal, to the Depositary for the Offer at:

                         MacKenzie Patterson Fuller, LP
                               1640 School Street
                            Moraga, California 94556
                            Facsimile: (925) 631-9119

If you have any questions or need assistance, please call the Depositary at
800-854-8357.

This Offer expires (unless extended) December 21, 2007.