Document:

<PAGE>

                                                                Exhibit (4)(iii)

                                                                      Rev. 10/99

     UNLESS THIS SUBORDINATED NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE
OF THE DEPOSITORY TRUST COMPANY (55 WATER STREET, NEW YORK, NEW YORK) TO THE
BANK OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY
SUBORDINATED NOTE ISSUED UPON REGISTRATION OR TRANSFER OF, OR IN EXCHANGE FOR,
OR IN LIEU OF, THIS SUBORDINATED NOTE IS REGISTERED IN THE NAME OF CEDE & CO. OR
SUCH OTHER NAME AS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY
TRUST COMPANY AND ANY PAYMENT HEREON IS MADE TO CEDE & CO., ANY TRANSFER, PLEDGE
OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL SINCE
THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

     IF THIS SUBORDINATED NOTE IS ISSUED WITH "ORIGINAL ISSUE DISCOUNT" FOR
PURPOSES OF SECTION 1273 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED, THE
FOLLOWING SHALL BE COMPLETED:  THE FOLLOWING INFORMATION IS PROVIDED SOLELY FOR
PURPOSES OF APPLYING SECTIONS 1272, 1273 AND 1275 OF THE UNITED STATES INTERNAL
REVENUE CODE OF 1986, AS AMENDED, TO THIS SUBORDINATED NOTE.  THE ISSUE DATE OF
THIS SUBORDINATED NOTE IS _______________.  THE ISSUE PRICE OF THIS SUBORDINATED
NOTE IS _____% OF ITS PRINCIPAL AMOUNT.  THE AMOUNT OF ORIGINAL ISSUE DISCOUNT
ON THIS SUBORDINATED NOTE IS $______________ PER $1,000 OF THE INITIAL PRINCIPAL
AMOUNT, THE YIELD TO MATURITY IS _____%, AND THE AMOUNT OF THE ORIGINAL ISSUE
DISCOUNT ALLOCABLE TO THE INITIAL SHORT ACCRUAL PERIOD, IF ANY, IS $_________
PER $1,000 OF THE INITIAL PRINCIPAL AMOUNT, DETERMINED ON THE BASIS OF THE EXACT
METHOD.

No. SUB FXR-______________                                           REGISTERED
CUSIP NO.: _______________

                          THE NORTHERN TRUST COMPANY

                         GLOBAL SUBORDINATED BANK NOTE
                                 (Fixed Rate)

                                       PRINCIPAL AMOUNT:
ORIGINAL ISSUE DATE:

INTEREST RATE:  _______%               MATURITY DATE:
INTEREST PAYMENT                       REGULAR RECORD DATES (If other than the
DATES:                                 April 1 or October 1, prior to each
                                       Interest Payment Date):

INITIAL REDEMPTION DATE:               INITIAL REDEMPTION
                                       PERCENTAGE:
<PAGE>

ANNUAL REDEMPTION
PERCENTAGE REDUCTION:

ORIGINAL ISSUE                       OID AMOUNT:
DISCOUNT NOTE:

Yes:_____  No:_____

OTHER PROVISIONS:

     The Northern Trust Company, an Illinois banking corporation (the "Bank"),
for value received, hereby promises to pay to Cede & Co., or registered assigns,
the principal amount specified on the face hereof in United States Dollars on
the Maturity Date specified above and to pay interest thereon from the Original
Issue Date specified above or from the most recent interest payment date to
which interest on this Subordinated Note (or any predecessor Subordinated Note)
has been paid or made available for payment, semi-annually on April 15 and
October 15 of each year (unless otherwise specified on the face hereof) (each,
an "Interest Payment Date") and at maturity or upon earlier redemption, if
applicable, commencing on the first Interest Payment Date next succeeding the
Original Issue Date (or, if the Original Issue Date is between a Regular Record
Date and the Interest Payment Date immediately following such Regular Record
Date, on the second Interest Payment Date following the Original Issue Date), at
the Interest Rate per annum specified above, until the principal hereof is paid
or made available for payment, and (to the extent that the payment of such
interest shall be legally enforceable) at such Interest Rate on any overdue
principal and premium, if any, and on any overdue installment of interest.  The
interest so payable, and punctually paid or duly provided for, on any Interest
Payment Date will be paid to the person in whose name this Subordinated Note (or
any predecessor Subordinated Note) is registered at the close of business on the
Regular Record Date for such interest, which shall be the April 1 and October 1
(whether or not a Business Day (as defined below)), as the case may be, next
preceding the applicable Interest Payment Date (unless otherwise specified on
the face hereof); provided, however, that interest payable at maturity or upon
earlier redemption, if applicable, will be payable to the person to whom
principal shall be payable.

     Payment of principal of, and premium, if any, and interest on, this
Subordinated Note will be made in such coin or currency of the United States of
America as at the time of payment is legal tender for payment of public and
private debts.  The Bank will at all times appoint and maintain a paying agent
(the "Paying Agent") authorized by the Bank to pay the principal of, and
premium, if any, and interest on, this Subordinated Note on behalf of the Bank
and having an office or agency (the "Paying Agent Office") in The City of New
York or the

                                      -2-
<PAGE>

City of Chicago, Illinois (the "Place of Payment"), where this Subordinated Note
may be presented or surrendered for payment and where notices, designations or
requests in respect of payments with respect to this Subordinated Note may be
served. The Bank has initially appointed itself as the Paying Agent, with the
Paying Agent Office currently located at 50 South LaSalle Street (Level BB-A),
Chicago, Illinois 60675, Attention: Securities Services.

     THIS SUBORDINATED NOTE IS A DIRECT, UNCONDITIONAL AND UNSECURED GENERAL
OBLIGATION OF THE BANK, DOES NOT EVIDENCE A DEPOSIT AND IS NOT INSURED BY THE
FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENT AGENCY.  THIS
SUBORDINATED NOTE IS SUBORDINATE TO THE CLAIMS OF DEPOSITORS AND GENERAL
CREDITORS OF THE BANK.

     Payment of the principal of, and premium, if any, and interest on, this
Subordinated Note due at maturity or upon earlier redemption, if applicable,
will be made in immediately available funds upon presentation and surrender of
this Subordinated Note to the Paying Agent at the Paying Agent Office in the
Place of Payment; provided that this Subordinated Note is presented to the
Paying Agent in time for the Paying Agent to make such payment in accordance
with its normal procedures. Payments of interest on this Subordinated Note
(other than at maturity or upon earlier redemption) will be made by wire
transfer to such account as has been appropriately designated to the Paying
Agent by the person entitled to such payments.

     This Subordinated Note is one of a duly authorized issue of Subordinated
Bank Notes due from five to fifteen years from date of issue of the Bank (herein
called the "Subordinated Notes").

     Payments of interest hereon on any Interest Payment Date will include
interest accrued to, but excluding, such Interest Payment Date. Interest hereon
shall be computed on the basis of a 360-day year of twelve 30-day months.

     If any Interest Payment Date, Maturity Date or date of earlier redemption
of this Subordinated Note falls on a day which is not a Business Day, the
related payment of principal, premium, if any, or interest shall be made on the
next succeeding Business Day with the same force and effect as if made on the
date such payment were due, and no interest shall accrue on the amount so
payable for the period from and after such Interest Payment Date, Maturity Date
or date of earlier redemption, as the case may be. "Business Day" means any day
other than a Saturday, Sunday or a day on which banking institutions in The City
of New York or the City of Chicago, Illinois generally are authorized or
obligated by law or executive order to close.

                                      -3-
<PAGE>

     The indebtedness of the Bank evidenced by this Subordinated Note, including
principal and interest, is unsecured and subordinate and junior in right of
payment to the Bank's obligations to its depositors, its obligations under
bankers' acceptances and letters of credit, and its obligations to its other
creditors (including any obligations to any Federal Reserve Bank and the Federal
Deposit Insurance Corporation), whether now outstanding or hereafter incurred,
other than any obligations which rank on a parity with, or junior to, the
Subordinated Notes. In the event of any insolvency proceeding, receivership,
conservatorship, reorganization, readjustment of debt, marshalling of assets and
liabilities or similar proceedings or any liquidation or winding-up of the Bank,
whether voluntary or involuntary, all such obligations (except obligations which
rank on a parity with, or junior to, the Subordinated Notes) shall be entitled
to be paid in full before any payment shall be made on account of the principal
of, or interest on, the Subordinated Notes. In the event of any such proceeding,
after payment in full of all sums owing with respect to such prior obligations,
the holders of the Subordinated Notes, together with the holders of any
obligations of the Bank ranking on a parity with the Subordinated Notes, shall
be entitled to be paid, from the remaining assets of the Bank, the unpaid
principal of, and the unpaid interest on, the Subordinated Notes or such other
obligations before any payment or other distribution, whether in cash, property,
or otherwise, shall be made on account of any capital stock or any obligations
of the Bank ranking junior to the Subordinated Notes.

     The Subordinated Notes shall rank on a parity with the $100,000,000
aggregate principal amount of 6.5% Subordinated Notes due 2003 issued by the
Bank in 1993, the $100,000,000 aggregate principal amount of 6.70% Subordinated
Notes due 2005 issued by the Bank in 1995, the $100,000,000 aggregate principal
amount of 7.30% Subordinated Notes due 2006 issued by the Bank in 1996, the
$100,000,000 aggregate principal amount of 6 1/4% Subordinated Notes due 2008
issued by the Bank in 1998, the $200,000,000 aggregate principal amount of 7.10%
Subordinated Notes due 2009 issued by the Bank in 1999 and such other
obligations which may be issued by the Bank which are specifically designated as
ranking on a parity with the Subordinated Notes by express provision in the
instruments creating or evidencing such obligations.

     This Subordinated Note will not be subject to any sinking fund. If so
provided on the face of this Subordinated Note and subject to the approval of
the Federal Reserve Bank of Chicago, this Subordinated Note may be redeemed by
the Bank on and after the Initial Redemption Date, if any, specified on the face
hereof. If no Initial Redemption Date is specified on the face hereof, this
Subordinated Note may not be redeemed prior to the Maturity Date. On and after
the Initial

                                      -4-
<PAGE>

Redemption Date, if any, and subject to the approval of the Federal Reserve Bank
of Chicago, this Subordinated Note may be redeemed at any time either in whole
or in part from time to time in increments of $1,000 (provided that any
remaining principal amount hereof shall be at least $250,000) at the option of
the Bank at the applicable Redemption Price (as defined below), together with
accrued and unpaid interest hereon at the applicable rate borne by this
Subordinated Note to the date of redemption (each such date, a "Redemption
Date"), on written notice given not more than 60 nor less than 30 calendar days
prior to the Redemption Date by the Bank to the registered holder hereof.
Whenever less than all the Subordinated Notes at any time outstanding are to be
redeemed, the terms of the Subordinated Notes to be so redeemed shall be
selected by the Bank. If less than all the Subordinated Notes with identical
terms at any time outstanding are to be redeemed, the Subordinated Notes to be
so redeemed shall be selected by the Paying Agent by lot or in any usual manner
approved by it. In the event of redemption of this Subordinated Note in part
only, a new Subordinated Note for the unredeemed portion hereof shall be issued
in the name of the holder hereof upon the surrender hereof.

     The "Redemption Price" shall initially be the Initial Redemption Percentage
specified on the face hereof of the principal amount of this Subordinated Note
to be redeemed and shall decline at each anniversary of the Initial Redemption
Date specified on the face hereof by the Annual Redemption Percentage Reduction,
if any, specified on the face hereof, of the principal amount to be redeemed
until the Redemption Price is 100% of such principal amount.

     This Subordinated Note will not be repayable at the option of the holder
hereof prior to maturity.

     If this Subordinated Note is an Original Issue Discount Note and if an
Event of Default with respect to this Subordinated Note shall have occurred and
be continuing, the Default Amount (as defined hereafter) of this Subordinated
Note may be declared due and payable in the manner and with the effect provided
herein. The "Default Amount" shall be equal to the adjusted issue price as of
the first day of the accrual period as determined under Treasury Regulation
Section 1.1275-1(b) (or successor regulation) under the United States Internal
Revenue Code of 1986, as amended, in which the date of acceleration occurs
increased by the daily portion of the original issue discount for each day in
such accrual period ending on the date of acceleration, as determined under
Treasury Regulation Section 1.1275-1(b) (or successor regulation) under the
United States Internal Revenue Code of 1986, as amended. Upon payment of (i) the
amount of principal or premium, if any, so declared due and payable and (ii)
interest on any overdue principal and overdue interest or premium, if any, (in
each case to the extent that the payment of such interest

                                      -5-
<PAGE>

shall be legally enforceable), all of the Bank's obligations in respect of the
payment of the principal of, and interest or premium, if any, on, this
Subordinated Note shall terminate.

     In case any Subordinated Note shall at any time become mutilated,
destroyed, lost or stolen and such Subordinated Note or evidence satisfactory to
the Bank of the loss, theft or destruction thereof (together with indemnity
satisfactory to the Bank and such other documents or proof as may be required in
the premises) shall be delivered to the Bank, a new Subordinated Note of like
tenor will be issued by the Bank in exchange for the Subordinated Note so
mutilated, or in lieu of the Subordinated Note so destroyed or lost or stolen.
All expenses and reasonable charges associated with procuring the indemnity
referred to above and with the preparation, authentication and delivery of a new
Subordinated Note shall be borne by the holder of the Subordinated Note so
mutilated, destroyed, lost or stolen. If any Subordinated Note which has matured
or is about to mature shall become mutilated, destroyed, lost or stolen, the
Bank may, instead of issuing a substitute Subordinated Note, pay or authorize
the payment of the same (without surrender thereof except in the case of a
mutilated Subordinated Note) upon compliance by the holder thereof with the
provisions of this paragraph.

     No recourse shall be had for the payment of the principal of, premium, if
any, or interest on, this Subordinated Note, for any claim based hereon, or
otherwise in respect hereof, against any shareholder, employee, officer or
director, as such, past, present or future, of the Bank or of any successor
corporation, either directly or through the Bank or any successor corporation,
whether by virtue of any constitution, statute or rule of law or by the
enforcement of any assessment or penalty or otherwise, all such liability being,
by the acceptance hereof and part of the consideration for the issue hereof,
expressly waived and released.

     An "Event of Default" with respect to this Subordinated Note will occur if
the Bank shall consent to, or a court or other governmental agency shall enter a
decree or order for, the appointment of a receiver or other similar official in
any liquidation, insolvency or similar proceeding with respect to the Bank or
all or substantially all of its property and, in the case of a decree or order,
such decree or order shall have remained in force for a period of 60 days. If an
Event of Default shall occur and be continuing, the holder of this Subordinated
Note may declare the principal amount of, and accrued interest and premium, if
any, on, this Subordinated Note due and payable immediately by written notice to
the Bank. Upon such declaration and notice, such principal amount, accrued
interest and premium, if any, shall become due and payable seven calendar days
after such notice. Any Event of Default with respect to this

                                      -6-
<PAGE>

Subordinated Note may be waived by the holder hereof. No payment may be made on
this Subordinated Note in the event of acceleration resulting from an Event of
Default without the prior written consent of the Federal Reserve Bank of
Chicago. There is no right of acceleration in the case of a default in the
payment of principal of, or interest on, this Subordinated Note or in the
performance of any other obligation of the Bank under this Subordinated Note or
under any other security issued by the Bank.

     No provision of this Subordinated Note shall alter or impair the obligation
of the Bank, which is absolute and unconditional, to pay the principal of, and
premium, if any, and interest on, this Subordinated Note in U.S. dollars at the
times, places and rate herein prescribed.

     The Bank shall cause to be kept at the corporate trust office of the
Subordinated Note Registrar designated below a register (the register maintained
in such corporate trust office or any other office or agency of the Bank in the
Place of Payment herein referred to as the "Subordinated Note Register") in
which, subject to such reasonable regulations as it may prescribe, the Bank
shall provide for the registration of the Subordinated Notes and of transfers of
the Subordinated Notes. The Bank is hereby initially appointed "Subordinated
Note Registrar" for the purpose of registering the Subordinated Notes and
transfers of the Subordinated Notes as herein provided.

     The transfer of this Subordinated Note is registrable in the Subordinated
Note Register, upon surrender of this Subordinated Note for registration of
transfer at the office or agency of the Bank in the Place of Payment, duly
endorsed by, or accompanied by a written instrument of transfer in form
satisfactory to the Bank and the Paying Agent duly executed by, the holder
hereof or his attorney duly authorized in writing, and thereupon one or more new
Subordinated Notes of like tenor, of authorized denominations and for the same
aggregate principal amount, will be issued to the designated transferee or
transferees. Notwithstanding the foregoing, the Bank shall not be required to
register the transfer of any Subordinated Note that has been called for
redemption during a period beginning at the opening of business fifteen calendar
days before the day of mailing of a notice of such redemption and ending at the
close of business on the day of such mailing.

     No service charge shall be made for any such registration of transfer or
exchange, but the Bank may require payment of a sum sufficient to cover any tax
or other governmental charge payable in connection therewith.

                                      -7-
<PAGE>

     The Subordinated Notes are issuable only in registered form without coupons
in minimum denominations of $250,000 and any integral multiple of $1,000 in
excess thereof. Each owner of a beneficial interest in this Subordinated Note is
required to hold a beneficial interest in $250,000 principal amount or any
integral multiple of $1,000 in excess thereof of this Subordinated Note at all
times.

     Prior to due presentment of this Subordinated Note for registration of
transfer, the Bank, the Paying Agent or any agent of the Bank or the Paying
Agent may treat the person in whose name this Subordinated Note is registered as
the owner hereof for all purposes, whether or not this Subordinated Note be
overdue, and neither the Bank, the Paying Agent nor any such agent shall be
affected by notice to the contrary.

     All notices to the Bank under this Subordinated Note shall be in writing
and addressed to the Bank at 50 South LaSalle Street (Level BB-A), Chicago,
Illinois 60675, Attention: Securities Services, or to such other address of the
Bank as the Bank may notify the holders of the Subordinated Notes.

     This Subordinated Note shall be governed by, and construed in accordance
with, the laws of the State of Illinois.

     IN WITNESS WHEREOF, the Bank has caused this instrument to be duly
executed.

                                              THE NORTHERN TRUST COMPANY

                                              By:
                                                 ______________________________
                                                    Authorized Signatory

                                      -8-
<PAGE>

                                 ABBREVIATIONS

     The following abbreviations, when used in the inscription on the face of
the within Subordinated Note, shall be construed as though they were written out
in full according to applicable laws or regulations.

                TEN COM    -  as tenants in common

                TEN ENT    -  as tenants by the entireties

                JT TEN     -  as joint tenants with right of survivorship and
                                 not as tenants in common

UNIF GIFT MIN ACT - _______________ Custodian ______________
                         (Cust)               (Minor)

                       under Uniform Gifts to Minors Act

                           __________________________
                                    (State)

                   Additional abbreviations may also be used
                         though not in the above list.

                                      -9-
<PAGE>

                                   ASSIGNMENT

   FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s)
unto___________________________________________________________________________

________________________________________________________________________________

PLEASE INSERT SOCIAL SECURITY NUMBER OR OTHER IDENTIFYING NUMBER OF ASSIGNEE

                    ---------------------------------------

                    ---------------------------------------

______________________________________________________________________________

______________________________________________________________________________
                  (Please print or typewrite name and address,
                    including postal zip code, of assignee)

________________________________________________________________________________
the within Subordinated Note and all rights thereunder, and hereby irrevocably
constitutes and appoints _______________________________________________________

________________________________________________________________________________

________________________________________________________________________________
to transfer said Subordinated Note on the books of the Bank, with full power of
substitution in the premises.___________________________________________________

________________________________________________________________________________

________________________________________________________________________________
Dated:
      ______________

                                    _________________________________________
                                    Notice:  The signature to this assignment
                                    must correspond with the name as written
                                    upon the face of the within Subordinated
                                    Note in every particular, without alteration
                                    or enlargement or any change whatsoever.

                                      -10-<PAGE>

                                                                Exhibit (4) (iv)

                                                                      Rev. 10/99

     UNLESS THIS SUBORDINATED NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE
OF THE DEPOSITORY TRUST COMPANY (55 WATER STREET, NEW YORK, NEW YORK) TO THE
BANK OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY
SUBORDINATED NOTE ISSUED UPON REGISTRATION OF TRANSFER OF, OR IN EXCHANGE FOR,
OR IN LIEU OF, THIS SUBORDINATED NOTE IS REGISTERED IN THE NAME OF CEDE & CO. OR
SUCH OTHER NAME AS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY
TRUST COMPANY AND ANY PAYMENT HEREON IS MADE TO CEDE & CO., ANY TRANSFER, PLEDGE
OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL SINCE
THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

     IF THIS SUBORDINATED NOTE IS ISSUED WITH "ORIGINAL ISSUE DISCOUNT" FOR
PURPOSES OF SECTION 1273 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED, THE
FOLLOWING SHALL BE COMPLETED: THE FOLLOWING INFORMATION IS PROVIDED SOLELY FOR
PURPOSES OF APPLYING SECTIONS 1272, 1273 AND 1275 OF THE UNITED STATES INTERNAL
REVENUE CODE OF 1986, AS AMENDED, TO THIS SUBORDINATED NOTE.  THE ISSUE DATE OF
THIS SUBORDINATED NOTE IS _____________.  THE ISSUE PRICE OF THIS SUBORDINATED
NOTE IS _____% OF ITS PRINCIPAL AMOUNT.  THE AMOUNT OF ORIGINAL ISSUE DISCOUNT
ON THIS SUBORDINATED NOTE IS $_________ PER $1,000 OF THE INITIAL PRINCIPAL
AMOUNT, THE YIELD TO MATURITY IS ____%, AND THE AMOUNT OF THE ORIGINAL ISSUE
DISCOUNT ALLOCABLE TO THE INITIAL SHORT ACCRUAL PERIOD, IF ANY, IS $_____ PER
$1,000 OF THE INITIAL PRINCIPAL AMOUNT, DETERMINED ON THE BASIS OF THE EXACT
METHOD.

No. SUB FLR-______________                                       REGISTERED
CUSIP NO.: _______________

                           THE NORTHERN TRUST COMPANY

                         GLOBAL SUBORDINATED BANK NOTE
                                (Floating Rate)

ORIGINAL ISSUE DATE:                     PRINCIPAL AMOUNT:

INITIAL BASE RATE:  ______%              MATURITY DATE:

                                      -1-
<PAGE>

INTEREST RATE BASIS:                     INDEX MATURITY:

SPREAD AND/OR SPREAD MULTIPLIER:         REGULAR RECORD DATES (If other than the
                                         15th day prior to each Interest Payment
                                         Date):
MAXIMUM INTEREST RATE:                   MINIMUM INTEREST RATE:

INTEREST PAYMENT DATES:                  INTEREST PAYMENT PERIOD:

INTEREST RESET DATES:                    INTEREST RESET PERIOD:

INITIAL REDEMPTION DATE:                 ANNUAL REDEMPTION PERCENTAGE REDUCTION:

INITIAL REDEMPTION PERCENTAGE:

ORIGINAL ISSUE DISCOUNT NOTE:            OID AMOUNT:

Yes:  ______   No: _____
OTHER PROVISIONS:                        CALCULATION AGENT:

                                         ALTERNATE RATE EVENT SPREAD:

     The Northern Trust Company, an Illinois banking corporation (the "Bank"),
for value received, hereby promises to pay to Cede & Co., or registered assigns,
the principal amount specified on the face hereof in United States Dollars on
the Maturity Date specified above and to pay interest thereon from the Original
Issue Date specified above or from the most recent interest payment date (or, if
the Interest Reset Period specified above is daily or weekly, from, and
including, the day following the most recent Regular Record Date) to which
interest on this Subordinated Note (or any predecessor Subordinated Note) has
been paid or made available for payment (each, an "Interest Payment Date"), on
the Interest Payment Dates specified above and at maturity or upon earlier
redemption, if applicable, commencing on the first Interest Payment Date next
succeeding the Original Issue Date (or, if the Original Issue Date is between a
Regular Record Date and the Interest Payment Date immediately following such
Regular Record Date, on the second Interest Payment Date following the Original
Issue Date), at a rate per annum equal to the Initial Base Rate specified above,
as adjusted by the addition or subtraction of the Spread, if any, specified
above and/or by the multiplication by the Spread Multiplier, if any, specified
above, until the first Interest Reset Date following the Original Issue Date
and, on and after

                                      -2-
<PAGE>

such Interest Reset Date, at the rate determined in accordance with the
provisions set forth herein, until the principal hereof is paid or made
available for payment, and (to the extent that the payment of such interest
shall be legally enforceable) at the last rate in effect prior to any payment
default on any overdue principal and premium, if any, and on any overdue
installment of interest. The interest so payable, and punctually paid or made
available for payment, on any Interest Payment Date will be paid to the person
in whose name this Subordinated Note (or any predecessor Subordinated Note) is
registered at the close of business on the Regular Record Date for such
interest, which shall be the 15th calendar day (whether or not a Business Day
(as defined below)) before such Interest Payment Date (unless otherwise
specified on the face hereof); provided, however, that interest payable at
maturity or upon earlier redemption, if applicable, will be payable to the
person to whom principal shall be payable.

     Payment of principal of, and premium, if any, and interest on, this
Subordinated Note will be made in such coin or currency of the United States of
America as at the time of payment is legal tender for payment of public and
private debts.  The Bank will at all times appoint and maintain a paying agent
(the "Paying Agent") authorized by the Bank to pay the principal of, and
premium, if any, and interest on, this Subordinated Note on behalf of the Bank
and having an office or agency (the "Paying Agent Office") in The City of New
York or the City of Chicago, Illinois (the "Place of Payment"), where this
Subordinated Note may be presented or surrendered for payment and where notices,
designations or requests in respect of payments with respect to this
Subordinated Note may be served.  The Bank has initially appointed itself as
such Paying Agent, with the Paying Agent Office currently located at 50 South
LaSalle Street (Level BB-A), Chicago, Illinois 60675, Attention: Securities
Services.

     THIS SUBORDINATED NOTE IS A DIRECT, UNCONDITIONAL AND UNSECURED GENERAL
OBLIGATION OF THE BANK, DOES NOT EVIDENCE A DEPOSIT AND IS NOT INSURED BY THE
FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENT AGENCY.  THIS
SUBORDINATED NOTE IS SUBORDINATE TO THE CLAIMS OF DEPOSITORS AND GENERAL
CREDITORS OF THE BANK.

     Payment of the principal of, and premium, if any, and interest on, this
Subordinated Note due at maturity or upon earlier redemption, if applicable,
will be made in immediately available funds upon presentation and surrender of
this

                                      -3-
<PAGE>

Subordinated Note to the Paying Agent at the Paying Agent Office in the Place of
Payment; provided that this Subordinated Note is presented to the Paying Agent
in time for the Paying Agent to make such payment in accordance with its normal
procedures. Payments of interest on this Subordinated Note (other than at
maturity or upon earlier redemption) will be made by wire transfer to such
account as has been appropriately designated to the Paying Agent by the person
entitled to such payments.

     This Subordinated Note is one of a duly authorized issue of Subordinated
Bank Notes due from five to fifteen years from date of issue of the Bank (herein
called the "Subordinated Notes").

     Unless otherwise indicated on the face hereof, if the rate of interest on
this Subordinated Note resets daily, weekly or monthly, the Interest Payment
Date for this Subordinated Note will be the third Wednesday of each month or the
third Wednesday of March, June, September and December of each year; if the rate
of interest on this Subordinated Note resets quarterly, the Interest Payment
Date for this Subordinated Note will be the third Wednesday of March, June,
September and December of each year; if the rate of interest on this
Subordinated Note resets semi-annually, the Interest Payment Date for this
Subordinated Note will be the third Wednesday of each of two months of each year
specified on the face hereof that are six months apart; and if the rate of
interest on this Subordinated Note resets annually, the Interest Payment Date
for this Subordinated Note will be the third Wednesday of the month specified on
the face hereof.  If any Interest Payment Date, Maturity Date or date of earlier
redemption of this Subordinated Note falls on a day that is not a Business Day,
such Interest Payment Date, Maturity Date or date of earlier redemption will be
the next succeeding Business Day; provided, however, that, if the Interest Rate
Basis specified on the face hereof is LIBOR and such next succeeding Business
Day is in the next succeeding calendar month, such Interest Payment Date (unless
it is also the Maturity Date) will be the immediately preceding Business Day.
"Business Day" means any day other than a Saturday, Sunday or a day on which
banking institutions in The City of New York or the City of Chicago, Illinois
generally are authorized or obligated by law or executive order to close, and
with respect to Subordinated Notes with respect to which the Interest Rate Basis
specified on the face hereof is LIBOR, any day on which dealings in U.S. dollars
are transacted in the London interbank market (a "London Business Day").

                                      -4-
<PAGE>

     The indebtedness of the Bank evidenced by this Subordinated Note, including
principal and interest, is unsecured and subordinate and junior in right of
payment to the Bank's obligations to its depositors, its obligations under
bankers' acceptances and letters of credit, and its obligations to its other
creditors (including any obligations to any Federal Reserve Bank and the Federal
Deposit Insurance Corporation), whether now outstanding or hereafter incurred,
other than any obligations which rank on a parity with, or junior to, the
Subordinated Notes.  In the event of any insolvency proceeding, receivership,
conservatorship, reorganization, readjustment of debt, marshalling of assets and
liabilities or similar proceedings or any liquidation or winding-up of the Bank,
whether voluntary or involuntary, all such obligations (except obligations which
rank on a parity with, or junior to, the Subordinated Notes) shall be entitled
to be paid in full before any payment shall be made on account of the principal
of, or interest on, the Subordinated Notes.  In the event of any such
proceeding, after payment in full of all sums owing with respect to such prior
obligations, the holders of the Subordinated Notes, together with the holders of
any obligations of the Bank ranking on a parity with the Subordinated Notes,
shall be entitled to be paid, from the remaining assets of the Bank, the unpaid
principal of, and the unpaid interest on, the Subordinated Notes or such other
obligations before any payment or other distribution, whether in cash, property,
or otherwise, shall be made on account of any capital stock or any obligations
of the Bank ranking junior to the Subordinated Notes.

     The Subordinated Notes shall rank on a parity with the $100,000,000
aggregate principal amount of 6.5% Subordinated Notes due 2003 issued by the
Bank in 1993, the $100,000,000 aggregate principal amount of 6.70% Subordinated
Notes due 2005 issued by the Bank in 1995, the $100,000,000 aggregate principal
amount of 7.30% Subordinated Notes due 2006 issued by the Bank in 1996, the
$100,000,000 aggregate principal amount of 6 1/4% Subordinated Notes due 2008
issued by the Bank in 1998, the $200,000,000 aggregate principal amount of 7.10%
Subordinated Notes due 2009 issued by the Bank in 1999 and such other
obligations which may be issued by the Bank which are specifically designated as
ranking on a parity with the Subordinated Notes by express provision in the
instruments creating or evidencing such obligations.

     This Subordinated Note will not be subject to any sinking fund.  If so
provided on the face of this Subordinated Note and

                                      -5-
<PAGE>

subject to the approval of the Federal Reserve Bank of Chicago, this
Subordinated Note may be redeemed by the Bank on and after the Initial
Redemption Date, if any, specified on the face hereof. If no Initial Redemption
Date is specified on the face hereof, this Subordinated Note may not be redeemed
prior to the Maturity Date. On and after the Initial Redemption Date, if any,
and subject to the approval of the Federal Reserve Bank of Chicago, this
Subordinated Note may be redeemed at any time either in whole or in part from
time to time in increments of $1,000 (provided that any remaining principal
amount hereof shall be at least $250,000) at the option of the Bank at the
applicable Redemption Price (as defined below), together with accrued and unpaid
interest hereon at the applicable rate borne by this Subordinated Note to the
date of redemption (each such date, a "Redemption Date"), on written notice
given not more than 60 nor less than 30 calendar days prior to the Redemption
Date by the Bank to the registered holder hereof. Whenever less than all the
Subordinated Notes at any time outstanding are to be redeemed, the terms of the
Subordinated Notes to be so redeemed shall be selected by the Bank. If less than
all the Subordinated Notes with identical terms at any time outstanding are to
be redeemed, the Subordinated Notes to be so redeemed shall be selected by the
Paying Agent by lot or in any usual manner approved by it. In the event of
redemption of this Subordinated Note in part only, a new Subordinated Note for
the unredeemed portion hereof shall be issued in the name of the holder hereof
upon the surrender hereof.

     The "Redemption Price" shall initially be the Initial Redemption Percentage
specified on the face hereof of the principal amount of this Subordinated Note
to be redeemed and shall decline at each anniversary of the Initial Redemption
Date specified on the face hereof by the Annual Redemption Percentage Reduction,
if any, specified on the face hereof, of the principal amount to be redeemed
until the Redemption Price is 100% of such principal amount.

     This Subordinated Note will not be repayable at the option of the holder
hereof prior to maturity.

     The rate of interest on this Subordinated Note will be reset daily, weekly,
monthly, quarterly, semi-annually or annually (each such period, an "Interest
Reset Period" for this Subordinated Note, and the first calendar day of an
Interest Reset Period, an "Interest Reset Date"), as specified on the face
hereof.  Unless otherwise indicated on the face hereof, if

                                      -6-
<PAGE>

this Subordinated Note resets daily, the Interest Reset Date will be each
Business Day; if this Subordinated Note resets weekly and the Interest Rate
Basis is not the Treasury Rate, the Interest Reset Date will be the Wednesday of
each week; if this Subordinated Note resets weekly and the Interest Rate Basis
is the Treasury Rate, the Interest Reset Date will be the Tuesday of each week
(except as provided below); if this Subordinated Note resets monthly, the
Interest Reset Date will be the third Wednesday of each month; if this
Subordinated Note resets quarterly, the Interest Reset Date will be the third
Wednesday of March, June, September and December; if this Subordinated Note
resets semi-annually, the Interest Reset Date will be the third Wednesday of
each of two months of each year which are six months apart, as specified on the
face hereof; and if this Subordinated Note resets annually, the Interest Reset
Date will be the third Wednesday of one month of each year, as specified on the
face hereof; provided, however, that (i) the base rate in effect from the
Original Issue Date to the first Interest Reset Date will be the Initial Base
Rate specified on the face hereof, and (ii) if this Subordinated Note resets
daily or weekly, the base rate in effect for each day following the second
Business Day before an Interest Payment Date to, but excluding, the Interest
Payment Date, and for each day following the second Business Day before the
Maturity Date to, but excluding the Maturity Date, will be the base rate in
effect on that second Business Day. If any Interest Reset Date with respect to
this Subordinated Note would otherwise be a day that is not a Business Day, such
Interest Reset Date will be the next succeeding Business Day, except that in the
case that the Interest Rate Basis specified on the face hereof is LIBOR, if such
Business Day is in the next succeeding calendar month, such Interest Reset Date
will be the immediately preceding Business Day.

     All calculations relating to this Subordinated Note will be made by the
"Calculation Agent."  The Bank will serve as Calculation Agent for this
Subordinated Note as of its Original Issue Date, unless otherwise specified on
the face hereof.  The Bank may appoint a different institution to serve as
Calculation Agent from time to time after the Original Issue Date of this
Subordinated Note without the consent of the holder and without notice.

     The Calculation Agent will determine the interest rate that takes effect on
an Interest Reset Date by reference to the Interest Determination Date.  Unless
otherwise specified on the

                                      -7-
<PAGE>

face hereof, (i) if the Interest Rate Basis is not LIBOR or the Treasury Rate,
the Interest Determination Date will be the second Business Day before the
Interest Reset Date; (ii) if the Interest Rate Basis is LIBOR, the Interest
Determination Date will be the second London Business Day (as defined below)
preceding the Interest Reset Date; and (iii) if the Interest Rate Basis is the
Treasury Rate, the Interest Determination Date will be the day of the week in
which the Interest Reset Date falls on which treasury bills -i.e., direct
obligations of the U.S. government - would normally be auctioned. Treasury bills
are usually sold at auction on the Monday of each week, unless that day is a
legal holiday, in which case the auction is usually held on the following
Tuesday but may be held on the preceding Friday. If as the result of a legal
holiday an auction is held on the preceding Friday, that Friday will be the
Treasury Interest Determination Date relating to the Interest Reset Date
occurring in the next succeeding week. If the auction is held on a day that
would otherwise be an Interest Reset Date, then the Interest Reset Date will
instead be the first Business Day following the auction date.

     Unless the Interest Rate is LIBOR, the Calculation Agent will calculate the
interest rate that takes effect on a particular Interest Reset Date no later
than the corresponding Interest Calculation Date.  The Interest Calculation Date
will be the earlier of (i) the tenth calendar day after the Interest
Determination Date or, if that tenth calendar day is not a Business Day, the
next succeeding Business Day, and (ii) the Business Day immediately preceding
the Interest Payment Date or the Maturity Date on which the next payment of
interest will be due.  The Calculation Agent need not wait until the relevant
Interest Calculation Date to determine the interest rate if the rate information
it needs to make the determination is available from the relevant sources
sooner.

     For each Interest Reset Period, the Calculation Agent will calculate the
amount of accrued interest by multiplying the face amount of this Subordinated
Note by an accrued interest factor for the Interest Reset Period.  This factor
will equal the sum of the interest factors calculated for each day during the
Interest Reset Period.  The interest factor for each day will be expressed as a
decimal and will be calculated by dividing the interest rate (also expressed as
a decimal) applicable to that day (i) by 360, if the Interest Rate Basis is the
Commercial Paper Rate, the Prime Rate, LIBOR, the CD Rate or the Federal

                                      -8-
<PAGE>

Funds Rate, or (ii) by the actual number of days in the year, if the Interest
Rate Basis is the Treasury Rate or the CMT Rate.

     Upon the request of the holder of this Subordinated Note, the Calculation
Agent will provide such holder with the interest rate then in effect for this
Subordinated Note and, if determined, the interest rate that will become
effective on the next Interest Reset Date. The Calculation Agent's determination
of any interest rate, and its calculation of the amount of interest for any
Interest Reset Period, will be final and binding in the absence of manifest
error.

     All percentages resulting from any calculation relating to this
Subordinated Note will be rounded upward or downward, as appropriate, to the
next higher or lower one hundred-thousandth of a percentage point.  For example,
9.876541% (or .09876541) would be rounded down to 9.87654% (or .0987654) and
9.876545% (or .09876545) would be rounded up to 9.87655% (or .0987655).  All
amounts used in or resulting from any calculation relating to this Subordinated
Note will be rounded upward or downward, as appropriate, to the nearest cent,
with one-half cent or more being rounded upward.

     In determining the Base Rate that applies this Subordinated Note during a
particular Interest Reset Period, the Calculation Agent may obtain rate quotes
from various banks or dealers active in the relevant market, as described in the
following subsections.  Those reference banks and dealers may include the
Calculation Agent itself, including the Bank, and its affiliates.

     Except as otherwise provided herein, the rate of interest on this
Subordinated Note for each Interest Reset Date will be the rate determined in
accordance with the provisions set forth under the applicable heading below
corresponding to the Interest Rate Basis specified on the face hereof.
Notwithstanding the foregoing, the interest rate hereon shall not be greater
than the Maximum Interest Rate, if any, specified on the face hereof and shall
not be lower than the Minimum Interest Rate, if any, specified on the face
hereof.  In addition, the interest rate hereon will in no event be greater than
the maximum rate permitted by Illinois law, as the same may be modified by
United States law of general application.

     Commercial Paper Rate.  If the Interest Rate Basis of this Subordinated
     ---------------------
Note is the Commercial Paper Rate, this

                                      -9-
<PAGE>

Subordinated Note will bear interest at a Base Rate equal to the Commercial
Paper Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on
the face hereof.

     The Commercial Paper Rate will be the Money Market Yield (as defined below)
of the rate, for the relevant Interest Determination Date, for commercial paper
having the Index Maturity (as defined below) specified on the face of this
Subordinated Note, as published in H.15(519) (as defined below) under the
heading "Commercial Paper -- Nonfinancial."  If the Commercial Paper Rate cannot
be determined as described above, the following procedures will apply:

           (i)   If the rate described above does not appear in H.15(519) at
     3:00 P.M., New York City time, on the relevant Interest Calculation Date
     (unless the calculation is made earlier and the rate is available from that
     source at that time), then the Commercial Paper Rate will be the rate, for
     the relevant Interest Determination Date, for commercial paper having the
     Index Maturity specified on the face of this Subordinated Note, as
     published in H.15 Daily Update (as defined below) or another recognized
     electronic source used for displaying that rate, under the heading
     "Commercial Paper -- Nonfinancial."

          (ii)   If the rate described above does not appear in H.15(519), H.15
     Daily Update or another recognized electronic source at 3:00 P.M., New York
     City time, on the relevant Interest Calculation Date (unless the
     calculation is made earlier and the rate is available from one of those
     sources at that time), the Commercial Paper Rate will be the Money Market
     Yield of the arithmetic mean of the offered rates, as of 11:00 A.M., New
     York City time, on the relevant Interest Determination Date, by three
     leading U.S. dollar commercial paper dealers in New York City selected by
     the Calculation Agent for U.S. dollar commercial paper that has the
     relevant Index Maturity and is placed for an industrial issuer whose bond
     rating is "AA", or the equivalent, from a nationally recognized rating
     agency.

          (iii)  If fewer than three dealers selected by the Calculation Agent
     are quoting as described above, the Commercial Paper Rate for the new
     Interest Reset Period will be the rate in effect for the prior Interest
     Reset Period.

                                      -10-
<PAGE>

     LIBOR.  If the Interest Rate Basis of this Subordinated Note is LIBOR, this
     -----
Subordinated Note will bear interest at a Base Rate equal to LIBOR, as adjusted
by the Spread or Spread Multiplier, if any, specified on the face hereof.  LIBOR
will be the London interbank offered rate for deposits of U.S. dollars.  LIBOR
will be either (a) the offered rate appearing on the Telerate LIBOR Page (as
defined below) or (b) the arithmetic mean of the offered rates appearing on the
Reuters screen LIBOR Page (as defined below), unless that page by its terms
cites only one rate, in which case that rate; in either case, as of 11:00 A.M.,
London time, on the relevant LIBOR Interest Determination Date, for deposits of
U.S. dollars having the relevant Index Maturity beginning on the relevant
Interest Reset Date.  If no reference page is specified on the face of this
Subordinated Note, the Telerate LIBOR Page will apply.  If LIBOR cannot be
determined in this manner, the following procedures will apply:

           (i)   If the Telerate LIBOR Page applies and the rate described above
     does not appear on that page, or if the Reuters Screen LIBOR Page applies
     and fewer than two of the rates described above appear on that page or no
     rate appears on any page on which only one rate normally appears, then
     LIBOR will be determined on the basis of the rates, at approximately 11:00
     A.M., London time, on the relevant LIBOR Interest Determination Date, at
     which deposits of U.S. dollars having the relevant Index Maturity,
     beginning on the relevant Interest Reset Date and in a Representative
     Amount (as defined below) are offered to prime banks in the London
     interbank market by four major banks in that market selected by the
     Calculation Agent. The Calculation Agent will request the principal London
     office of each of these banks to provide a quotation of its rate. If at
     least two quotations are provided, LIBOR for the relevant LIBOR Interest
     Determination Date will be the arithmetic mean of the quotations.

          (ii)   If fewer than two quotations are provided as described above,
     LIBOR for the relevant LIBOR Interest Determination Date will be the
     arithmetic mean of the rates for loans of U.S. dollars having the relevant
     Index Maturity, beginning on the relevant Interest Reset Date and in a
     Representative Amount to leading European banks quoted, at approximately
     11:00 A.M., New York City time, on that LIBOR Interest Determination Date,
     by three major banks in New York City selected by the Calculation Agent.

                                      -11-
<PAGE>

          (iii)  If fewer than three banks selected by the Calculation Agent are
     quoting as described above, LIBOR for the new Interest Reset Period will be
     the rate in effect for the prior Interest Reset Period.

     Treasury Rate.  If the Interest Rate Basis of this Subordinated Note is the
     -------------
Treasury Rate, this Subordinated Note will bear interest at a Base Rate equal to
the Treasury Rate, as adjusted by the Spread or Spread Multiplier, if any,
specified on the face hereof.

     The Treasury Rate will be the rate for the auction, on the relevant
Treasury Interest Determination Date, of treasury bills having the Index
Maturity specified in the on the face of this Subordinated Note, as that rate
appears on Telerate Page (as defined below) 56 or 57 under the heading
"Investment Rate."  If the Treasury Rate cannot be determined in this manner,
the following procedures will apply:

           (i)   If the rate described above does not appear on either page at
     3:00 P.M., New York City time, on the relevant Interest Calculation Date
     (unless the calculation is made earlier and the rate is available from that
     source at that time), the Treasury Rate will be the Bond Equivalent Yield
     (as defined below) of the rate, for the relevant Interest Determination
     Date, for the type of treasury bill described above, as published in H.15
     Daily Update or another recognized electronic source used for displaying
     that rate, under the heading "U.S. Government Securities/Treasury
     Bills/Auction High."

          (ii)   If the rate described in the prior paragraph does not appear in
     H.15 Daily Update or another recognized electronic source at 3:00 P.M., New
     York City time, on the relevant Interest Calculation Date (unless the
     calculation is made earlier and the rate is available from one of those
     sources at that time), the Treasury Rate will be the Bond Equivalent Yield
     of the auction rate, for the relevant Treasury Interest Determination Date
     and for treasury bills of the kind described above, as announced by the
     U.S. Department of the Treasury.

          (iii)  If the auction rate described in the prior paragraph is not so
     announced by 3:00 P.M., New York City time, on the relevant Interest
     Calculation Date, or if no

                                      -12-
<PAGE>

     such auction is held for the relevant week, then the Treasury Rate will be
     the Bond Equivalent Yield of the rate, for the relevant Treasury Interest
     Determination Date and for treasury bills having a remaining maturity
     closest to the specified Index Maturity, as published in H.15(519) under
     the heading "U.S. Government Securities/Treasury Bills/Secondary Market."

          (iv)   If the rate described in the prior paragraph does not appear in
     H.15(519) at 3:00 P.M., New York City time, on the relevant Interest
     Calculation Date (unless the calculation is made earlier and the rate is
     available from one of those sources at that time), then the Treasury Rate
     will be the rate, for the relevant Treasury Interest Determination Date and
     for treasury bills having a remaining maturity closest to the specified
     Index Maturity, as published in H.15 Daily Update or another recognized
     electronic source used for displaying that rate, under the heading "U.S.
     Government Securities/Treasury Bills/Secondary Market."

          (v)    If the rate described in the prior paragraph does not appear in
     H.15 Daily Update or another recognized electronic source at 3:00 P.M., New
     York City time, on the relevant Interest Calculation Date (unless the
     calculation is made earlier and the rate is available from one of those
     sources at that time), the Treasury Rate will be the Bond Equivalent Yield
     of the arithmetic mean of the secondary market bid rates as of
     approximately 3:30 P.M., New York City time, on the relevant Treasury
     Interest Determination Date, of three primary U.S. government securities
     dealers in New York City selected by the Calculation Agent for the issue of
     treasury bills with a remaining maturity closest to the specified Index
     Maturity.

          (vi)   If fewer than three dealers selected by the Calculation Agent
     are quoting as described in the prior paragraph, the Treasury Rate in
     effect for the new Interest Reset Period will be the rate in effect for the
     prior Interest Reset Period.

     CMT Rate.  If the Interest Rate Basis of this Subordinated Note is the CMT
     --------
Rate, this Subordinated Note will bear interest at a Base Rate equal to the CMT
Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on the
face hereof.

                                      -13-
<PAGE>

     The CMT Rate will be the rate displayed on the Designated CMT Telerate Page
(as defined below) under the heading ". . . Treasury Constant Maturities . . .
Federal Reserve Board Release H.15 . . . Mondays Approximately 3:45 P.M.," under
the column for the Designated CMT Index Maturity (as defined below), as follows:
(a) if the Designated CMT Telerate Page is Telerate Page 7051, the rate for the
relevant Interest Determination Date, or (b) if the Designated CMT Telerate Page
is Telerate Page 7052, the weekly or monthly average, as specified on the face
of this Subordinated Note, for the week that ends immediately before the week in
which the relevant Interest Determination Date falls, or for the month that ends
immediately before the month in which the relevant Interest Determination Date
falls, as applicable.  If the CMT Rate cannot be determined in this manner, the
following procedures will apply:

           (i)   If the applicable rate described above is not displayed on the
     relevant Designated CMT Telerate Page at 3:00 P.M., New York City time, on
     the relevant Interest Calculation Date (unless the calculation is made
     earlier and the rate is available from that source at that time), then the
     CMT Rate will be the applicable treasury constant maturity rate described
     above -- that is, for the Designated CMT Index Maturity and for either the
     relevant Interest Determination Date or the weekly or monthly average, as
     applicable -- as published in H.15(519).

          (ii)   If the applicable rate described above does not appear in
     H.15(519) at 3:00 P.M., New York City time, on the relevant Interest
     Calculation Date (unless the calculation is made earlier and the rate is
     available from one of those sources at that time), then the CMT Rate will
     be the treasury constant maturity rate, or other U.S. treasury rate, for
     the Designated CMT Index Maturity and with reference to the relevant
     Interest Determination Date, that (a) is published by the Board of
     Governors of the Federal Reserve System, or the U.S. Department of the
     Treasury, and (b) is determined by the Calculation Agent to be comparable
     to the applicable rate formerly displayed on the Designated CMT Telerate
     Page and published in H.15(519).

          (iii)  If the rate described in the prior paragraph does not appear at
     3:00 P.M., New York City time, on the relevant Interest Calculation Date
     (unless the calculation is made earlier and the rate is available from one
     of those

                                      -14-
<PAGE>

     sources at that time), then the CMT Rate will be the yield to maturity of
     the arithmetic mean of the offered rates, as of approximately 3:30 P.M.,
     New York City time, on the relevant Interest Determination Date, of three
     primary U.S. government securities dealers in New York City selected by the
     Calculation Agent for the most recently issued treasury notes having an
     original maturity of approximately the Designated CMT Index Maturity and a
     remaining term to maturity of not less than the Designated CMT Index
     Maturity minus one year, and in a Representative Amount. In selecting these
     offered rates, the Calculation Agent will request quotations from five of
     these primary dealers and will disregard the highest quotation -- or, if
     there is equality, one of the highest -- and the lowest quotation -- or, if
     there is equality, one of the lowest. Treasury notes are direct, non-
     callable, fixed rate obligations of the U.S. government.

          (iv)   If the Calculation Agent is unable to obtain three quotations
     of the kind described in the prior paragraph, the CMT rate will be the
     yield to maturity of the arithmetic mean of the offered rates, as of
     approximately 3:30 P.M., New York City time, on the relevant Interest
     Determination Date, of three primary U.S. government securities dealers in
     New York City selected by the Calculation Agent for treasury notes with an
     original maturity longer than the Designated CMT Index Maturity, with a
     remaining term to maturity closest to the Designated CMT Index Maturity and
     in a Representative Amount. In selecting these offered rates, the
     Calculation Agent will request quotations from five of these primary
     dealers and will disregard the highest quotation -- or, if there is
     equality, one of the highest -- and the lowest quotation -- or, if there is
     equality, one of the lowest. If two treasury notes with an original
     maturity longer than the Designated CMT Index Maturity have remaining terms
     to maturity that are equally close to the Designated CMT Index Maturity,
     the Calculation Agent will obtain quotations for the treasury note with the
     shorter remaining term to maturity.

          (v)    If fewer than five but more than two of these primary dealers
     are quoting as described in the prior paragraph, then the CMT Rate for the
     relevant Interest Determination Date will be based on the arithmetic mean
     of

                                      -15-
<PAGE>

     the offered rates so obtained, and neither the highest nor the lowest of
     those quotations will be disregarded.

          (vi)   If two or fewer primary dealers selected by the Calculation
     Agent are quoting as described above, the CMT Rate in effect for the new
     Interest Reset Period will be the rate in effect for the prior Interest
     Reset Period.

     CD Rate.  If the Interest Rate Basis of this Subordinated Note is the CD
     -------
Rate, this Subordinated Note will bear interest at a Base Rate equal to the CD
Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on the
face hereof.

     The CD Rate will be the rate, on the relevant Interest Determination Date,
for negotiable U.S. dollar certificates of deposit having the Index Maturity
specified on the face of this Subordinated Note, as published in H.15(519) under
the heading "CDs (Secondary Market)."  If the CD Rate cannot be determined in
this manner, the following procedures will apply:

           (i)   If the rate described above does not appear in H.15(519) at
     3:00 P.M., New York City time, on the relevant Interest Calculation Date
     (unless the calculation is made earlier and the rate is available from that
     source at that time), then the CD Rate will be the rate, for the relevant
     Interest Determination Date, described above as published in H.15 Daily
     Update or another recognized electronic source used for displaying that
     rate, under the heading "CDs (Secondary Market)."

          (ii)   If the rate described above does not appear in H.15(519), H.15
     Daily Update or another recognized electronic source at 3:00 P.M., New York
     City time, on the relevant Interest Calculation Date (unless the
     calculation is made earlier and the rate is available from one of those
     sources at that time), the CD Rate will be the arithmetic mean of the rates
     offered as of 10:00 A.M., New York City time, on the relevant Interest
     Determination Date, by three leading nonbank dealers in negotiable U.S.
     dollar certificates of deposit in New York City, as selected by the
     Calculation Agent for negotiable U.S. dollar certificates of deposit of
     major U.S. money center banks with a remaining maturity closest to the
     specified Index Maturity, and in a Representative Amount.

                                      -16-
<PAGE>

          (iii) If fewer than three dealers selected by the Calculation Agent
     are quoting as described above, the CD Rate in effect for the new Interest
     Reset Period will be the rate in effect for the prior Interest Reset
     Period.

     Federal Funds Rate.  If the Interest Rate Basis of this Subordinated Note
     ------------------
is the Federal Funds Rate, this Subordinated Note will bear interest at a Base
Rate equal to the Federal Funds Rate, as adjusted by the Spread or Spread
Multiplier, if any, specified on the face hereof.

     The Federal Funds Rate will be the rate for U.S. dollar federal funds on
the relevant Interest Determination Date, as published in H.15(519) under the
heading "Federal Funds (Effective)," as that rate is displayed on Telerate Page
120.  If the Federal Funds Rate cannot be determined in this manner, the
following procedures will apply:

          (i)   If the rate described above is not displayed on Telerate Page
     120 at 3:00 P.M., New York City time, on the relevant Interest Calculation
     Date (unless the calculation is made earlier and the rate is available from
     that source at that time), then the Federal Funds Rate, for the relevant
     Interest Determination Date, will be the rate described above as published
     in H.15 Daily Update or another recognized electronic source used for
     displaying that rate, under the heading "Federal Funds (Effective)."

          (ii)  If the rate described above is not displayed on Telerate Page
     120 and does not appear in H.15 Daily Update or another recognized
     electronic source at 3:00 P.M., New York City time, on the relevant
     Interest Calculation Date (unless the calculation is made earlier and the
     rate is available from one of those sources at that time), the Federal
     Funds Rate will be the arithmetic mean of the rates for the last
     transaction in overnight, U.S. dollar federal funds arranged, before 9:00
     A.M., New York City time, on the relevant Interest Determination Date, by
     three leading brokers of U.S. dollar federal funds transactions in New York
     City selected by the Calculation Agent.

          (iii) If fewer than three brokers selected by the Calculation Agent
     are quoting as described above, the Federal Funds Rate in effect for the
     new Interest Reset Period will be the rate in effect for the prior Interest
     Reset Period.

                                      -17-
<PAGE>

     Prime Rate.  If the Interest Rate Basis of this Subordinated Note is the
     ----------
Prime Rate, this Subordinated Note will bear interest at a Base Rate equal to
the Prime Rate, as adjusted by the Spread or Spread Multiplier, if any,
specified on the face hereof.

     The Prime Rate will be the rate, for the relevant Interest Determination
Date, published in H.15(519) under the heading "Bank Prime Loan."  If the Prime
Rate cannot be determined as described above, the following procedures will
apply.

          (i)   If the rate described above does not appear in H.15(519) at 3:00
     P.M., New York City time, on the relevant Interest Calculation Date (unless
     the calculation is made earlier and the rate is available from that source
     at that time), then the Prime Rate will be the rate, for the relevant
     Interest Determination Date, as published in H.15 Daily Update or another
     recognized electronic source used for the purpose of displaying that rate,
     under the heading "Bank Prime Loan."

          (ii)  If the rate described above does not appear in H.15(519), H.15
     Daily Update or another recognized electronic source at 3:00 P.M., New York
     City time, on the relevant Interest Calculation Date (unless the
     calculation is made earlier and the rate is available from one of those
     sources at that time), then the Prime Rate will be the arithmetic mean of
     the rates of interest publicly announced by each bank appearing on the
     Reuters Screen US PRIME 1 Page (as defined below) as that bank's prime rate
     or base lending rate, as of 11:00 A.M., New York City time, on the relevant
     Interest Determination Date.

          (iii) If fewer than four of these rates appear on the Reuters Screen
     US PRIME 1 Page, the Prime Rate will be the arithmetic mean of the prime
     rates or base lending rates, as of the close of business on the relevant
     Interest Determination Date, of three major banks in New York City selected
     by the Calculation Agent. For this purpose, the Calculation Agent will use
     rates quoted on the basis of the actual number of days in the year divided
     by a 360-day year.

          (iv)  If fewer than three banks selected by the Calculation Agent are
     quoting as described above, the Prime

                                      -18-
<PAGE>

     Rate for the new Interest Reset Period will be the rate in effect for the
     prior Interest Reset Period.

     Definitions of Terms Used in Interest Rate Bases.  The terms listed below
     ------------------------------------------------
are defined as follows:

     "Bond Equivalent Yield" means a yield expressed as a percentage and
calculated in accordance with the following formula:
                  D x N       x 100
             ---------------
              360 - (D x M)

where (i) "D" means the annual rate for treasury bills quoted on a bank discount
basis and expressed as a decimal, (ii) "N" means the number of days in the year,
365 or 366, as the case may be, and (iii) "M" means the actual number of days in
the applicable Interest Reset Period.

     "Business Day" means, for purposes of calculating interest on this
Subordinated Note, a day that is a Monday, Tuesday, Wednesday, Thursday or
Friday that is not a day on which banking institutions in New York City
generally are authorized or obligated by law, regulation or executive order to
close and, if the Interest Rate Basis specified on the face hereof is LIBOR, is
also a London Business Day.

     "Designated CMT Index Maturity" means the Index Maturity for a Note having
as its Interest Rate Basis the CMT Rate and will be the original period to
maturity of a U.S. treasury security -- either 1, 2, 3, 5, 7, 10, 20 or 30 years
-- specified in the applicable pricing supplement.  If no such original maturity
period is so specified, the Designated CMT Index Maturity will be 2 years.

     "Designated CMT Telerate Page" means the Telerate Page specified on the
face of this Subordinated Note (if the Interest Rate Basis is the CMT Rate) that
displays treasury constant maturities as reported in H.15(519).  If no Telerate
Page is so specified, then the applicable page will be Telerate Page 7052.  If
Telerate Page 7052 applies but this Subordinated Note does not specify whether
the weekly or monthly average applies, the weekly average will apply.

     "H.15(519)" means the weekly statistical release entitled "Statistical
Release H.15 (519)," or any successor publication,

                                      -19-
<PAGE>

published by the Board of Governors of the Federal Reserve System.

     "H.15 Daily Update" means the daily update of H.15(519) available through
the world wide web site of the Board of Governors of the Federal Reserve System,
at http://www.bog.frb.fed.us/releases/h15/update or any successor site or
publication.

     "Index Maturity" means the period to maturity of the instrument or
obligation on which the interest rate formula is based, as specified on the face
of this Subordinated Note.

     "London Business Day" means any day on which dealings in U.S. dollars are
transacted in the London interbank market.

     "Money Market Yield" means a yield expressed as a percentage and calculated
in accordance with the following formula:

                  D x 360     x 100
             ---------------
              360 - (D x M)

where (a) "D" means the annual rate for commercial paper quoted on a bank
discount basis and expressed as a decimal, and (b) "M" means the actual number
of days in the relevant Interest Reset Period.

     "Representative Amount" means an amount that, in the Calculation Agent's
judgment, is representative of a single transaction in the relevant market at
the relevant time.

     "Reuters Screen LIBOR Page" means the display on the Reuters Monitor Money
Rates Service, or any successor service, on the page designated as "LIBO" or any
replacement page or pages on which London interbank rates of major banks for
U.S. dollars are displayed.

     "Reuters Screen US PRIME 1 Page" means the display on the "US PRIME 1" page
on the Reuters Monitor Money Rates Service, or any successor service, or any
replacement page or pages on that service, for the purpose of displaying prime
rates or base lending rates of major U.S. banks.

                                      -20-
<PAGE>

     "Telerate LIBOR Page" means Telerate Page 3750 or any replacement page or
pages on which London interbank rates of major banks for U.S. dollars are
displayed.

     "Telerate Page" means the display on Bridge Telerate, Inc., or any
successor service, on the page or pages specified in a Subordinated Note, or any
replacement page or pages on that service.

     References to particular headings on pages designated by the following
terms include any successor or replacement heading or headings as determined by
the Calculation Agent: CMT Telerate Page, H.15(519), H.15 Daily Update, Reuters
Screen LIBOR Page, Reuters Screen US PRIME 1 Page, Telerate LIBOR Page or
Telerate Page.

     If this Subordinated Note is an Original Issue Discount Note and if an
Event of Default with respect to this Subordinated Note shall have occurred and
be continuing, the Default Amount (as defined hereafter) of this Subordinated
Note may be declared due and payable in the manner and with the effect provided
herein.  The "Default Amount" shall be equal to the adjusted issue price as of
the first day of the accrual period as determined under Treasury Regulation
Section 1.1275-1(b) (or successor regulation) under the United States Internal
Revenue Code of 1986, as amended, in which the date of acceleration occurs
increased by the daily portion of the original issue discount for each day in
such accrual period ending on the date of acceleration, as determined under
Treasury Regulation Section 1.1275-1(b) (or successor regulation) under the
United States Internal Revenue Code of 1986, as amended.  Upon payment of (i)
the amount of principal or premium, if any, so declared due and payable and (ii)
interest on any overdue principal and overdue interest or premium, if any (in
each case to the extent that the payment of such interest shall be legally
enforceable), all of the Bank's obligations in respect of the payment of the
principal of, and interest or premium, if any, on, this Subordinated Note shall
terminate.

     In case any Subordinated Note shall at any time become mutilated,
destroyed, lost or stolen and such Subordinated Note or evidence satisfactory to
the Bank of the loss, theft or destruction thereof (together with indemnity
satisfactory to the Bank and such other documents or proof as may be required in
the premises) shall be delivered to the Bank, a new Subordinated Note of like
tenor will be issued by the Bank in exchange for the Subordinated Note so
mutilated, or in lieu of the

                                      -21-
<PAGE>

Subordinated Note so destroyed or lost or stolen. All expenses and reasonable
charges associated with procuring the indemnity referred to above and with the
preparation, authentication and delivery of a new Subordinated Note shall be
borne by the holder of the Subordinated Note so mutilated, destroyed, lost or
stolen. If any Subordinated Note which has matured or is about to mature shall
become mutilated, destroyed, lost or stolen, the Bank may, instead of issuing a
substitute Subordinated Note, pay or authorize the payment of the same (without
surrender thereof except in the case of a mutilated Subordinated Note) upon
compliance by the holder thereof with the provisions of this paragraph.

     No recourse shall be had for the payment of the principal of, premium, if
any, or interest on, this Subordinated Note, for any claim based hereon, or
otherwise in respect hereof, against any shareholder, employee, officer or
director, as such, past, present or future, of the Bank or of any successor
corporation, either directly or through the Bank or any successor corporation,
whether by virtue of any constitution, statute or rule of law or by the
enforcement of any assessment or penalty or otherwise, all such liability being,
by the acceptance hereof and as part of the consideration for the issue hereof,
expressly waived and released.

     An "Event of Default" with respect to this Subordinated Note will occur if
the Bank shall consent to, or a court or other governmental agency shall enter a
decree or order for, the appointment of a receiver or other similar official in
any liquidation, insolvency or similar proceeding with respect to the Bank or
all or substantially all of its property and, in the case of a decree or order,
such decree or order shall have remained in force for a period of 60 days.  If
an Event of Default shall occur and be continuing, the holder of this
Subordinated Note may declare the principal amount of, and accrued interest and
premium, if any, on, this Subordinated Note due and payable immediately by
written notice to the Bank.  Upon such declaration and notice, such principal
amount, accrued interest and premium, if any, shall become due and payable seven
calendar days after such notice.  Any Event of Default with respect to this
Subordinated Note may be waived by the holder hereof.  No payment may be made on
this Subordinated Note in the event of acceleration resulting from an Event of
Default without the prior written consent of the Federal Reserve Bank of
Chicago.  There is no right of acceleration in the case of a default in the
payment of principal of, or interest on, this

                                      -22-
<PAGE>

Subordinated Note or in the performance of any other obligation of the Bank
under this Subordinated Note or under any other security issued by the Bank.

     No provision of this Subordinated Note shall alter or impair the obligation
of the Bank, which is absolute and unconditional, to pay the principal, and
premium, if any, and interest on, this Subordinated Note in U.S. dollars at the
times, places and rate herein prescribed.

     The Bank shall cause to be kept at the corporate trust office of the
Subordinated Note Registrar designated below a register (the register maintained
in such corporate trust office or any other office or agency of the Bank in the
Place of Payment herein referred to as the "Subordinated Note Register") in
which, subject to such reasonable regulations as it may prescribe, the Bank
shall provide for the registration of the Subordinated Notes and of transfers of
the Subordinated Notes.  The Bank is hereby initially appointed "Subordinated
Note Registrar" for the purposes of registering the Subordinated Notes and
transfers of the Subordinated Notes as herein provided.

     The transfer of this Subordinated Note is registrable in the Subordinated
Note Register, upon surrender of this Subordinated Note for registration of
transfer at the office or agency of the Bank in the Place of Payment, duly
endorsed by, or accompanied by a written instrument of transfer in form
satisfactory to the Bank and the Paying Agent duly executed by, the holder
hereof or his attorney duly authorized in writing, and thereupon one or more new
Subordinated Notes of like tenor, of authorized denominations and for the same
aggregate principal amount, will be issued to the designated transferee or
transferees.  Notwithstanding the foregoing, the Bank shall not be required to
register the transfer of any Subordinated Note that has been called for
redemption during a period beginning at the opening of business fifteen calendar
days before the day of mailing of a notice of such redemption and ending at the
close of business on the day of such mailing.

     No service charge shall be made for any such registration of transfer or
exchange, but the Bank may require payment of a sum sufficient to cover any tax
or other governmental charge payable in connection therewith.

                                      -23-
<PAGE>

     The Subordinated Notes are issuable only in registered form without coupons
in minimum denominations of $250,000 and any integral multiple of $1,000 in
excess thereof.  Each owner of a beneficial interest in this Subordinated Note
is required to hold a beneficial interest in $250,000 principal amount or any
integral multiple of $1,000 in excess thereof of this Subordinated Note at all
times.

     Prior to due presentment of this Subordinated Note for registration of
transfer, the Bank, the Paying Agent or any agent of the Bank or the Paying
Agent may treat the person in whose name this Subordinated Note is registered as
the owner hereof for all purposes, whether or not this Subordinated Note be
overdue, and neither the Bank, the Paying Agent nor any such agent shall be
affected by notice to the contrary.

     All notices to the Bank under this Subordinated Note shall be in writing
and addressed to the Bank at 50 South LaSalle Street, Chicago, Illinois 60675,
or to such other address of the Bank as the Bank may notify the holders of the
Subordinated Notes.

     This Subordinated Note shall be governed by, and construed in accordance
with, the laws of the State of Illinois.

     IN WITNESS WHEREOF, the Bank has caused this instrument to be duly
executed.

                                             THE NORTHERN TRUST COMPANY

                                             By:--------------------------
                                                 Authorized Signatory

                                      -24-
<PAGE>

                                 ABBREVIATIONS

          The following abbreviations, when used in the inscription on the face
of the within Subordinated Note, shall be construed as though they were written
out in full according to applicable laws or regulations.

          TEN COM - as tenants in common

          TEN ENT - as tenants by the entireties

          JT TEN  - as joint tenants with right of survivorship
               and not as tenants in common

UNIF GIFT MIN ACT -    ____________        Custodian        ____________
                          (Cust)                               (Minor)
               under Uniform Gifts to Minors Act

                       _________________________________
                                    (State)

                   Additional abbreviations may also be used
                         though not in the above list.

                                      -25-
<PAGE>

                                  ASSIGNMENT

          FOR VALVE RECEIVED, the undersigned hereby sell(s), assign(s) and
transfer(s) unto ______________________________________________________________
_______________________________________________________________________________

PLEASE INSERT SOCIAL SECURITY NUMBER OR OTHER IDENTIFYING NUMBER OF ASSIGNEE

                    _______________________________________
                    _______________________________________

_______________________________________________________________________________

_______________________________________________________________________________
                 (Please print or typewrite name and address,
                    including postal zip code, of assignee)

_______________________________________________________________________________

the within Subordinated Note and all rights thereunder, and hereby irrevocably
constitutes and appoints ______________________________________________________
_______________________________________________________________________________

to transfer said Subordinated Note on the books of the Bank, with full power of
substitution in the premises.

Dated: ______________

                                       ----------------------------------------
                                       NOTICE:  The signature to this
                                       assignment must correspond with the name
                                       as written upon the face of the within
                                       Subordinated Note in every particular,
                                       without alteration or enlargement or any
                                       change whatsoever.

                                      -26-

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