FORM OF WARRANT TO PURCHASE COMMON STOCK

      FORM OF WARRANT TO PURCHASE COMMON STOCK

THE SECURITIES REPRESENTED BY THIS INSTRUMENT HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF ANY STATE AND MAY NOT BE TRANSFERRED, SOLD OR OTHERWISE DISPOSED OF EXCEPT WHILE A REGISTRATION STATEMENT RELATING THERETO IS IN EFFECT UNDER SUCH ACT AND APPLICABLE STATE SECURITIES LAWS OR PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER SUCH ACT OR SUCH LAWS. THIS INSTRUMENT IS ISSUED SUBJECT TO THE RESTRICTIONS ON TRANSFER AND OTHER PROVISIONS OF A SECURITIES PURCHASE AGREEMENT BETWEEN THE ISSUER OF THESE SECURITIES AND THE INVESTOR REFERRED TO THEREIN, A COPY OF WHICH IS ON FILE WITH THE ISSUER. THE SECURITIES REPRESENTED BY THIS INSTRUMENT MAY NOT BE SOLD OR OTHERWISE TRANSFERRED EXCEPT IN COMPLIANCE WITH SAID AGREEMENT. ANY SALE OR OTHER TRANSFER NOT IN COMPLIANCE WITH SAID AGREEMENT WILL BE VOID.

WARRANT

to purchase

154,242

Shares of Common Stock

of Bank of Marin Bancorp

1.           Definitions . Unless the context otherwise requires, when used herein the following terms shall have the meanings indicated.

"Affiliate" has the meaning ascribed to it in the Purchase Agreement.

"Appraisal Procedure" means a procedure whereby two independent appraisers, one chosen by the Company and one by the Original Warrantholder, shall mutually agree upon the determinations then the subject of appraisal. Each party shall deliver a notice to the other appointing its appraiser within 15 days after the Appraisal Procedure is invoked. If within 30 days after appointment of the two appraisers they are unable to agree upon the amount in question, a third independent appraiser shall be chosen within 10 days thereafter by the mutual consent of such first two appraisers. The decision of the third appraiser so appointed and chosen shall be given within 30 days after the selection of such third appraiser. If three appraisers shall be appointed and the determination of one appraiser is disparate from the middle determination by more than twice the amount by which the other determination is disparate from the middle determination, then the determination of such appraiser shall be excluded, the remaining two determinations shall be averaged and such average shall be binding and conclusive upon the Company and the Original Warrantholder; otherwise, the average of all three determinations shall be binding upon the Company and the Original Warrantholder. The costs of conducting any Appraisal Procedure shall be borne by the Company.

"Board of Directors" means the board of directors of the Company, including any duly authorized committee thereof.

"Business Combination" means a merger, consolidation, statutory share exchange or similar transaction that requires the approval of the Company's stockholders.

"business day" means any day except Saturday, Sunday and any day on which banking institutions in the State of New York generally are authorized or required by law or other governmental actions to close.

"Capital Stock" means (A) with respect to any Person that is a corporation or company, any and all shares, interests, participations or other equivalents (however designated) of capital or capital stock of such Person and (B) with respect to any Person that is not a corporation or company, any and all partnership or other equity interests of such Person.

"Charter" means, with respect to any Person, its certificate or articles of incorporation, articles of association, or similar organizational document.

"Common Stock" has the meaning ascribed to it in the Purchase Agreement.

"Company" means the Person whose name, corporate or other organizational form and jurisdiction of organization is set forth in Item 1 of Schedule A hereto.

"conversion" has the meaning set forth in Section 13(B).

"convertible securities" has the meaning set forth in Section 13(B). "CPP" has the meaning ascribed to it in the Purchase Agreement.

"Exchange Act" means the Securities Exchange Act of 1934, as amended, or any successor statute, and the rules and regulations promulgated thereunder.

"Exercise Price" means the amount set forth in Item 2 of Schedule A hereto. "Expiration Time" has the meaning set forth in Section 3.

"Fair Market Value" means, with respect to any security or other property, the fair market value of such security or other property as determined by the Board of Directors, acting in good faith or, with respect to Section 14, as determined by the Original Warrantholder acting in good faith. For so long as the Original Warrantholder holds this Warrant or any portion thereof, it may object in writing to the Board of Director's calculation of fair market value within 10 days of receipt of written notice thereof. If the Original Warrantholder and the Company are unable to agree on fair market value during the 10-day period following the delivery of the Original Warrantholder's objection, the Appraisal Procedure may be invoked by either party to determine Fair Market Value by delivering written notification thereof not later than the 30 th day after delivery of the Original Warrantholder's objection.

"Governmental Entities" has the meaning ascribed to it in the Purchase Agreement.

"Initial Number" has the meaning set forth in Section 13(B).

"Issue Date " means the date set forth in Item 3 of Schedule A hereto.

"Market Price" means, with respect to a particular security, on any given day, the last reported sale price regular way or, in case no such reported sale takes place on such day, the average of the last closing bid and ask prices regular way, in either case on the principal national securities exchange on which the applicable securities are listed or admitted to trading, or if not listed or admitted to trading on any national securities exchange, the average of the closing bid and ask prices as furnished by two members of the Financial Industry Regulatory Authority, Inc. selected from time to time by the Company for that purpose. "Market Price" shall be determined without reference to after hours or extended hours trading. If such security is not listed and traded in a manner that the quotations referred to above are available for the period required hereunder, the Market Price per share of Common Stock shall be deemed to be (i) in the event that any portion of the Warrant is held by the Original Warrantholder, the fair market value per share of such security as determined in good faith by the Original Warrantholder or (ii) in all other circumstances, the fair market value per share of such security as determined in good faith by the Board of Directors in reliance on an opinion of a nationally recognized independent investment banking corporation retained by the Company for this purpose and certified in a resolution to the Warrantholder. For the purposes of determining the Market Price of the Common Stock on the "trading day" preceding, on or following the occurrence of an event, (i) that trading day shall be deemed to commence immediately after the regular scheduled closing time of trading on the New York Stock Exchange or, if trading is closed at an earlier time, such earlier time and (ii) that trading day shall end at the next regular scheduled closing time, or if trading is closed at an earlier time, such earlier time (for the avoidance of doubt, and as an example, if the Market Price is to be determined as of the last trading day preceding a specified event and the closing time of trading on a particular day is 4:00 p.m. and the specified event occurs at 5:00 p.m. on that day, the Market Price would be determined by reference to such 4:00 p.m. closing price).

"Ordinary Cash Dividends" means a regular quarterly cash dividend on shares of Common Stock out of surplus or net profits legally available therefor (determined in accordance with generally accepted accounting principles in effect from time to time), provided that Ordinary Cash Dividends shall not include any cash dividends paid subsequent to the Issue Date to the extent the aggregate per share dividends paid on the outstanding Common Stock in any quarter exceed the amount set forth in Item 4 of Schedule A hereto, as adjusted for any stock split, stock dividend, reverse stock split, reclassification or similar transaction.

"Original Warrantholder" means the United States Department of the Treasury. Any actions specified to be taken by the Original Warrantholder hereunder may only be taken by such Person and not by any other Warrantholder.

"Permitted Transactions" has the meaning set forth in Section 13(B).

"Per Share Fair Market Value" has the meaning set forth in Section 13(C).

"Preferred Shares" means the perpetual preferred stock issued to the Original Warrantholder on the Issue Date pursuant to the Purchase Agreement.

"Pro Rata Repurchases" means any purchase of shares of Common Stock by the Company or any Affiliate thereof pursuant to (A) any tender offer or exchange offer subject to Section 13(e) or 14(e) of the Exchange Act or Regulation 14E promulgated thereunder or (B) any other offer available to substantially all holders of Common Stock, in the case of both (A) or (B), whether for cash, shares of Capital Stock of the Company, other securities of the Company, evidences of indebtedness of the Company or any other Person or any other property (including, without limitation, shares of Capital Stock, other securities or evidences of indebtedness of a subsidiary), or any combination thereof, effected while this Warrant is outstanding. The "Effective Date" of a Pro Rata Repurchase shall mean the date of acceptance of shares for purchase or exchange by the Company under any tender or exchange offer which is a Pro Rata Repurchase or the date of purchase with respect to any Pro Rata Repurchase that is not a tender or exchange offer.

"Purchase Agreement" means the Securities Purchase Agreement - Standard Terms incorporated into the Letter Agreement, dated as of the date set forth in Item 5 of Schedule A hereto, as amended from time to time, between the Company and the United States Department of the Treasury (the "Letter Agreement"), including all annexes and schedules thereto.

"Qualified Equity Offering" has the meaning ascribed to it in the Purchase Agreement.

"Regulatory Approvals" with respect to the Warrantholder, means, to the extent applicable and required to permit the Warrantholder to exercise this Warrant for shares of Common Stock and to own such Common Stock without the Warrantholder being in violation of applicable law, rule or regulation, the receipt of any necessary approvals and authorizations of, filings and registrations with, notifications to, or expiration or termination of any applicable waiting period under, the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the rules and regulations thereunder.

"SEC" means the U.S. Securities and Exchange Commission.

"Shares" has the meaning set forth in Section 2.

"trading day" means (A) if the shares of Common Stock are not traded on any national or regional securities exchange or association or over-the-counter market, a business day or (B) if the shares of Common Stock are traded on any national or regional securities exchange or association or over-the-counter market, a business day on which such relevant exchange or quotation system is scheduled to be open for business and on which the shares of Common Stock (i) are not suspended from trading on any national or regional securities exchange or association or over-the-counter market for any period or periods aggregating one half hour or longer; and (ii) have traded at least once on the national or regional securities exchange or association or over-the-counter market that is the primary market for the trading of the shares of Common Stock.

"U.S. GAAP" means United States generally accepted accounting principles.

"Warrantholder" has the meaning set forth in Section 2.

"Warrant" means this Warrant, issued pursuant to the Purchase Agreement.

2.           Number of Shares; Exercise Price . This certifies that, for value received, the United States Department of the Treasury or its permitted assigns (the "Warrantholder") is entitled, upon the terms and subject to the conditions hereinafter set forth, to acquire from the Company, in whole or in part, after the receipt of all applicable Regulatory Approvals, if any, up to an aggregate of the number of fully paid and nonassessable shares of Common Stock set forth in Item 6 of Schedule A hereto, at a purchase price per share of Common Stock equal to the Exercise Price. The number of shares of Common Stock (the "Shares") and the Exercise Price are subject to adjustment as provided herein, and all references to "Common Stock," "Shares and "Exercise Price" herein shall be deemed to include any such adjustment or series of adjustments.

3.           Exercise of Warrant; Term . Subject to Section 2, to the extent permitted by applicable laws and regulations, the right to purchase the Shares represented by this Warrant is exercisable, in whole or in part by the Warrantholder, at any time or from time to time after the execution and delivery of this Warrant by the Company on the date hereof, but in no event later than 5:00 p.m., New York City time on the tenth anniversary of the Issue Date (the "Expiration Time"), by (A) the surrender of this Warrant and Notice of Exercise annexed hereto, duly completed and executed on behalf of the Warrantholder, at the principal executive office of the Company located at the address set forth in Item 7 of Schedule A hereto (or such other office or agency of the Company in the United States as it may designate by notice in writing to the Warrantholder at the address of the Warrantholder appearing on the books of the Company), and (B) payment of the Exercise Price for the Shares thereby purchased:

(i) by having the Company withhold, from the shares of Common Stock that would otherwise be delivered to the Warrantholder upon such exercise, shares of Common stock issuable upon exercise of the Warrant equal in value to the aggregate Exercise Price as to which this Warrant is so exercised based on the Market Price of the Common Stock on the trading day on which this Warrant is exercised and the Notice of Exercise is delivered to the Company pursuant to this Section 3, or

(ii) with the consent of both the Company and the Warrantholder, by tendering in cash, by certified or cashier's check payable to the order of the Company, or by wire transfer of immediately available funds to an account designated by the Company.

If the Warrantholder does not exercise this Warrant in its entirety, the Warrantholder will be entitled to receive from the Company within a reasonable time, and in any event not exceeding three business days, a new warrant in substantially identical form for the purchase of that number of Shares equal to the difference between the number of Shares subject to this Warrant and the number of Shares as to which this Warrant is so exercised. Notwithstanding anything in this Warrant to the contrary, the Warrantholder hereby acknowledges and agrees that its exercise of this Warrant for Shares is subject to the condition that the Warrantholder will have first received any applicable Regulatory Approvals.

4.           Issuance of Shares; Authorization; Listing . Certificates for Shares issued upon exercise of this Warrant will be issued in such name or names as the Warrantholder may designate and will be delivered to such named Person or Persons within a reasonable time, not to exceed three business days after the date on which this Warrant has been duly exercised in accordance with the terms of this Warrant. The Company hereby represents and warrants that any Shares issued upon the exercise of this Warrant in accordance with the provisions of Section 3 will be duly and validly authorized and issued, fully paid and nonassessable and free from all taxes, liens and charges (other than liens or charges created by the Warrantholder, income and franchise taxes incurred in connection with the exercise of the Warrant or taxes in respect of any transfer occurring contemporaneously therewith). The Company agrees that the Shares so issued will be deemed to have been issued to the Warrantholder as of the close of business on the date on which this Warrant and payment of the Exercise Price are delivered to the Company in accordance with the terms of this Warrant, notwithstanding that the stock transfer books of the Company may then be closed or certificates representing such Shares may not be actually delivered on such date. The Company will at all times reserve and keep available, out of its authorized but unissued Common Stock, solely for the purpose of providing for the exercise of this Warrant, the aggregate number of shares of Common Stock then issuable upon exercise of this Warrant at any time. The Company will (A) procure, at its sole expense, the listing of the Shares issuable upon exercise of this Warrant at any time, subject to issuance or notice of issuance, on all principal stock exchanges on which the Common Stock is then listed or traded and (B) maintain such listings of such Shares at all times after issuance. The Company will use reasonable best efforts to ensure that the Shares may be issued without violation of any applicable law or regulation or of any requirement of any securities exchange on which the Shares are listed or traded.

5.           No Fractional Shares or Scrip . No fractional Shares or scrip representing fractional Shares shall be issued upon any exercise of this Warrant. In lieu of any fractional Share to which the Warrantholder would otherwise be entitled, the Warrantholder shall be entitled to receive a cash payment equal to the Market Price of the Common Stock on the last trading day preceding the date of exercise less the pro-rated Exercise Price for such fractional share.

6.           No Rights as Stockholders; Transfer Books . This Warrant does not entitle the Warrantholder to any voting rights or other rights as a stockholder of the Company prior to the date of exercise hereof. The Company will at no time close its transfer books against transfer of this Warrant in any manner which interferes with the timely exercise of this Warrant.

7.           Charges, Taxes and Expenses . Issuance of certificates for Shares to the Warrantholder upon the exercise of this Warrant shall be made without charge to the Warrantholder for any issue or transfer tax or other incidental expense in respect of the issuance of such certificates, all of which taxes and expenses shall be paid by the Company.

8.           Transfer/Assignment .

(A)        Subject to compliance with clause (B) of this Section 8, this Warrant and all rights hereunder are transferable, in whole or in part, upon the books of the Company by the registered holder hereof in person or by duly authorized attorney, and a new warrant shall be made and delivered by the Company, of the same tenor and date as this Warrant but registered in the name of one or more transferees, upon surrender of this Warrant, duly endor