Document:

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                                                                    Exhibit 4(d)

                GUARANTEED MINIMUM WITHDRAWAL BENEFIT ENDORSEMENT

Notwithstanding any provision in the Contract or Certificate ("Contract") to the
contrary, this Endorsement becomes a part of the Contract to which it is
attached. Should any provision in this Endorsement conflict with the Contract,
the provisions of this Endorsement will prevail.

Subject to the terms and conditions set forth herein, this optional Endorsement
provides a Guaranteed Minimum Withdrawal Benefit that guarantees an amount
available for Withdrawal as of the Benefit Availability Date not to exceed a
maximum annual dollar amount to be distributed over a specified number of years,
even if the Contract Value has been reduced to zero due to unfavorable
investment performance ("GMWB"). This GMWB may be purchased [on the date the
Contract is issued], provided that all Owner(s) are age [80] or younger on the
date of election of the GMWB.

EFFECTIVE DATE: [DATE]

BENEFIT AVAILABILITY DATE: [DATE]

                                   DEFINITIONS

Terms not defined in this Endorsement shall have the same meaning given to them
in the Contract.

BENEFIT AVAILABILITY DATE

The date shown above which is the earliest date on which You can begin to take
Withdrawals pursuant to the terms of this Endorsement.

BENEFIT YEAR

Each consecutive one year period beginning on the Benefit Availability Date.

EFFECTIVE DATE

The date shown above when this Endorsement becomes effective. If this
Endorsement is elected at Contract issue, the Effective Date is the date Your
Contract is issued. [If this Endorsement is elected after Your Contract has been
issued, the Effective Date is the [Contract Anniversary following] Your
election.]

ELIGIBLE PURCHASE PAYMENTS

The Purchase Payments or portion thereof that are used in the calculation of the
Withdrawal Benefit Base ("WBB").

MAXIMUM ANNUAL WITHDRAWAL AMOUNT ("MAWA")

The maximum amount available for withdrawal, each Benefit Year, under the GMWB.

MINIMUM WITHDRAWAL PERIOD ("MWP")

The minimum period of time after the Benefit Availability Date over which You
may take Your remaining Withdrawals under the GMWB.

SPOUSAL BENEFICIARY

Your spouse, if designated as Your primary Beneficiary on the date of Your
death, who elects to continue the Contract as the new Owner or Participant
("Owner") upon Your death.

STEPPED-UP BENEFIT BASE ("SBB")

A component of the calculation of the GMWB, which is used to determine the total
amount of the guaranteed Withdrawals under the GMWB and the minimum time period
over which You may take Withdrawals under the GMWB.

STEP-UP

A percentage of the Withdrawal Benefit Base ("WBB"), which when added to the WBB
results in the SBB.

WITHDRAWAL

The amount of any full or partial surrender of Contract Value and any fees or
charges attributable to the surrendered amount.

WITHDRAWAL BENEFIT BASE ("WBB")

A component of the calculation of the GMWB, which is used to determine the
amount of guaranteed Withdrawals and the initial maximum amount available for
withdrawal annually, under the GMWB.

                                       1
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WITHDRAWAL PERIOD

The period of time during which You are taking withdrawals under the GMWB, which
begins on the Benefit Availability Date and ends upon the earlier of a
termination of the Endorsement or when the SBB is reduced to zero. This period
may not be shorter than the MWP but may be longer than the MWP.

                GUARANTEED MINIMUM WITHDRAWAL BENEFIT PROVISIONS

This Endorsement provides a GMWB subject to the terms and conditions described
herein.

GMWB CHARGE

The charge deducted from Your Contract Value on a [quarterly] basis beginning
one [quarter] following the Effective Date and ending upon the earliest of (a) a
termination of the Endorsement; or, (b) reduction of the SBB to zero; or (c) the
time at which the Contract Value is reduced to zero. [The full [quarterly]
charge will also be deducted upon full surrender or annuitization of Your
Contract.]

The amount of the charge will equal:

<TABLE>
<CAPTION>
               TIME PERIOD                           ANNUALIZED GMWB CHARGE                      AS A PERCENTAGE OF
               -----------                           ----------------------                      ------------------
<S>                                                  <C>                                         <C>
 [Prior to the Benefit Availability Date]                   [0.60%]                                    [WBB]
   [During the Withdrawal Period [Years                     [0.60%]                                    [WBB]
                  0-30]]
   [During the Withdrawal Period [Years                     [0.45%]                                    [WBB]
                  0-30]]
</TABLE>

The GMWB Charge is calculated as [one-fourth] of the annualized GMWB Charge, and
is deducted [quarterly] as a percentage of the [WBB], as described above.

CALCULATION OF THE COMPONENTS OF THE GMWB

The GMWB is not available for withdrawal until the Benefit Availability Date and
must be withdrawn at least over the MWP. If You need to take Withdrawals or are
required to take minimum required distributions ("MRD") under the IRC from this
Contract, prior to the Benefit Availability Date, You should know that
Withdrawals taken before the Benefit Availability Date will result in a Step-Up
amount of [0%] and will negatively impact the value of the GMWB. The amount of
Withdrawals and time period over which You can take Withdrawals under the GMWB
may change over time as a result of withdrawal activity within the Contract.
Withdrawals made pursuant to this Endorsement are treated like any other
Withdrawal under the Contract for purposes of calculating Contract Value,
Withdrawal Charges, and any other benefits under the Contract. Withdrawals in
excess of the Penalty Free Withdrawal amount will be assessed a Withdrawal
Charge, if applicable. We reserve the right to limit the investment options
available under Your Contract if You elect the GMWB.

To determine the GMWB, We calculate each of the following components: WBB, SBB,
MAWA and MWP. The calculations for each component are detailed below.

WITHDRAWAL BENEFIT BASE ("WBB")

The initial WBB is equal to (a) if the GMWB is elected on the Contract Date, or
(b) if the GMWB is elected after the Contract Date, minus (c) where:

      (a)   is the Eligible Purchase Payments received on the Effective Date and
            any subsequent Eligible Purchase Payments multiplied by the
            percentage as specified in the table below; and

      (b)   is the Contract Value on the Effective Date and any subsequent
            Eligible Purchase Payments multiplied by the percentage as specified
            in the table below; and

      (c)   is a proportionate adjustment for each partial Withdrawal taken
            subsequent to the Effective Date but prior to the Benefit
            Availability Date. A proportionate adjustment is an amount equal to
            the WBB immediately prior to a Withdrawal multiplied by the
            percentage by which the Contract Value is reduced at the time of
            that Withdrawal.

                                       2
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The table below identifies the Eligible Purchase Payments used to calculate the
initial WBB, as determined by the time elapsed between the Effective Date and
the day on which [Gross] Purchase Payments are received by Us and deposited into
Your Contract. Payment Enhancements, if applicable, are not considered Purchase
Payments and therefore are not included in the Eligible Premiums.

<TABLE>
<CAPTION>
          TIME ELAPSED SINCE EFFECTIVE DATE                   PERCENTAGE INCLUDED IN THE WBB CALCULATION
          ---------------------------------                   ------------------------------------------
<S>                                                           <C>
                    [0-[90] Days]                                               [100%]
                 [91 Days to 1 Year]                                            [80%]
                 [More than 1 Year]                                              [0%]
</TABLE>

The amount of the WBB will change over time due to withdrawal activity within
the Contract. Withdrawals in excess of MAWA may reduce the WBB by more than the
amount of the Withdrawal. See IMPACT OF WITHDRAWALS below. The WBB is not used
in the calculation of Contract Value or any other benefits under this Contract.
We reserve the right to limit the WBB to a maximum of [$1,000,000].

STEPPED-UP BENEFIT BASE ("SBB")

The Step-Up amount is added to the WBB to arrive at the SBB, which is used to
determine the maximum amount available for Withdrawal under the GMWB and the
minimum time period over which You may take Withdrawals under the GMWB. The
Step-Up amount is [20%] of the WBB on the Benefit Availability Date so long as
no Withdrawals are taken prior to the Benefit Availability Date. If Withdrawals
are taken prior to the Benefit Availability Date, the Step-Up amount is [0%] of
the WBB as of the Benefit Availability Date. The Step-Up amount is only
available to You by taking Withdrawals under the GMWB.

The amount of the SBB will change over time due to withdrawal activity within
the Contract. Withdrawals in excess of MAWA may reduce the SBB by more than the
amount of the Withdrawal. See IMPACT OF WITHDRAWALS below. The SBB is not used
in the calculation of Contract Value or any other benefits under this Contract.

MAXIMUM ANNUAL WITHDRAWAL AMOUNT ("MAWA")

The MAWA is an amount calculated as a percentage of the [WBB]. The applicable
percentage for the initial MAWA will equal:

<TABLE>
<CAPTION>
  TIME ELAPSED SINCE THE EFFECTIVE DATE                    PERCENTAGE                         MAWA AS A PERCENTAGE OF
  -------------------------------------                    ----------                         -----------------------
<S>                                                        <C>                                <C>
                [0-3 years]                                   [0%]*                                    [WBB]
                [3+ years]                                    [8%]                                     [WBB]
               [0-30 years]                                   [0%]                                     [WBB]
</TABLE>

      *     There is a [3] year waiting period prior to the Benefit Availability
            Date.

If You are taking minimum required distributions ("MRD") from the Contract, the
MAWA is the greater of the MAWA as described above or the annual MRD amount.

The MAWA can be withdrawn periodically throughout each Benefit Year during the
Withdrawal Period. If You do not withdraw the entire MAWA in a Benefit Year, the
amount not withdrawn will extend Your MWP, but cannot be used to increase future
MAWA. Withdrawals in excess of the MAWA in any Benefit Year will reduce Your
future MAWA. See IMPACT OF WITHDRAWALS section below.

MINIMUM WITHDRAWAL PERIOD ("MWP")

The MWP is the minimum period of time after the Benefit Availability Date over
which You may take Your remaining Withdrawals under the GMWB. The initial MWP
equals the SBB divided by the initial MAWA.

We calculate a new MWP after each Withdrawal during the Withdrawal Period.
Withdrawals in excess of the MAWA will reduce the MWP. See IMPACT OF WITHDRAWALS
section below.

                                       3
<PAGE>

IMPACT OF WITHDRAWALS

Withdrawals under this Endorsement reduce the Contract Value and the amount
available for Withdrawal under the GMWB. Withdrawals equal to or less than the
MAWA generally reduce these values by the amount of the Withdrawal. Withdrawals
in excess of the MAWA may reduce these values based on the relative size of the
Withdrawal in relation to the Contract Value at the time of the Withdrawal. This
means that when investment performance is down, Withdrawals greater than the
MAWA will result in a greater reduction of these values. We further explain this
impact and the effect on each component of the GMWB through the mathematical
calculations below:

WITHDRAWALS IMPACT CONTRACT VALUE AND THE COMPONENTS OF THE GMWB CALCULATION AS
FOLLOWS:

      1.    CONTRACT VALUE: Any Withdrawal reduces the Contract Value by the
            amount of the Withdrawal.

      2.    WBB: Withdrawals prior to the Benefit Availability Date reduce the
            WBB proportionately in an amount equal to the WBB immediately prior
            to a Withdrawal multiplied by the percentage by which the Contract
            Value is reduced at the time of that Withdrawal.

            Withdrawals during the Withdrawal Period will not reduce the WBB
            until the sum of Withdrawals exceeds the Step-Up amount. Any
            Withdrawal or portion thereof that causes total Withdrawals during
            the Withdrawal Period to exceed the Step-Up amount, but is less than
            or equal to the MAWA, will reduce the WBB by the amount of the
            Withdrawal. Any such Withdrawal in excess of the MAWA reduces the
            WBB to the lesser of (a) or (b), where:

            a.    is the WBB immediately prior to the Withdrawal minus the
                  amount of the Withdrawal, or;

            b.    is the WBB immediately prior to the Withdrawal minus the
                  amount of the Withdrawal that is equal to the current MAWA,
                  and further reduced proportionately by the same amount by
                  which the Contract Value is reduced by the amount in excess of
                  the MAWA.

      3.    SBB: Since Withdrawals prior to the Benefit Availability Date reduce
            the WBB proportionately, the SBB will likewise be reduced
            proportionately during that period of time and further eliminate any
            Step-Up amount.

            During the Withdrawal Period, any Withdrawal in a Benefit Year which
            does not cause total Withdrawals in that Benefit Year to exceed the
            MAWA reduces the SBB by the amount of the Withdrawal. During the
            Withdrawal Period, any Withdrawal in a Benefit Year which causes
            total Withdrawals in that Benefit Year to exceed the MAWA, reduces
            the SBB to the lesser of (a) or (b) where:

            a.    is the SBB immediately prior to the Withdrawal minus the
                  amount of the Withdrawal, or;

            b.    is the SBB immediately prior to the Withdrawal minus the
                  portion of any Withdrawal which does not cause total
                  Withdrawals in that Benefit Year to exceed the current MAWA
                  and further reduced proportionately by the same amount by
                  which the Contract Value is reduced by the Withdrawal amount
                  in excess of the MAWA.

      4.    MWP: After each Withdrawal a new MWP is calculated. For Withdrawals
            in a Benefit Year that are less than or equal to MAWA, the new MWP
            equals the SBB after the Withdrawal divided by the current MAWA.

            After any Withdrawal that causes the sum of Withdrawals in a Benefit
            Year to exceed the MAWA, the new MWP equals the MWP calculated at
            the end of the prior Benefit Year reduced by one year.

      5.    MAWA: If the sum of Withdrawals in a Benefit Year does not exceed
            the MAWA for that Benefit Year, the MAWA does not change for the
            next Benefit Year. If total Withdrawals in a Benefit Year exceed the
            MAWA, the MAWA will be recalculated at the start of the next Benefit
            Year.

            The new MAWA will equal the SBB on that Benefit Year anniversary
            divided by the MWP on that Benefit Year Anniversary. The new MAWA
            may be lower than Your previously calculated MAWA.

IF YOUR CONTRACT VALUE IS REDUCED TO ZERO

If Your Contract Value is reduced to zero and the SBB has not been reduced to
zero, subsequent Purchase Payments will no longer be accepted and a Death
Benefit will not be payable upon the death of the Owner. You can receive the
remaining value of the GMWB under one of the following options:

                                       4
<PAGE>

      a.    A lump sum equal to the discounted present value of any remaining
            guaranteed payments under the GMWB; or,

      b.    Periodic payments during each Benefit Year that in total are equal
            to the MAWA until the SBB has been reduced to zero. If You do not
            select a specific frequency for these payments, We will pay the
            current MAWA in [quarterly] payments; or,

      c.    Any payment option that is mutually agreeable.

TERMINATION OF THE GMWB

Once elected the GMWB Endorsement and its corresponding charge [cannot] be
terminated by the Owner. [If terminated by the Owner, the cancellation is
effective [on the Contract Anniversary following the election to terminate].]
The Endorsement and the related charge will terminate automatically if:

      1.    The SBB has been reduced to zero; or,

      2.    A Spousal Beneficiary elects to continue the Contract without this
            Endorsement; or,

      3.    A Death Benefit is paid (as described under the [Death Provisions or
            Death Benefit] section of Your Contract); or,

      4.    The Contract is fully withdrawn or surrendered; or,

      5.    The Contract is annuitized.

We reserve the right to terminate the GMWB Endorsement if Withdrawals in excess
of MAWA in any Benefit Year reduce the SBB by [50%] or more.

SPOUSAL CONTINUATION

Upon election to continue the Contract and this Endorsement, Your Spousal
Beneficiary will be subject to the terms and conditions described herein with
respect to the GMWB. The Effective Date and Benefit Availability Date will not
change as a result of Spousal Continuation. A Continuation Contribution paid
under the Spousal Continuation provision of this Contract is not considered an
Eligible Purchase Payment for purposes of this Endorsement.

Signed for the Company to be effective on the Effective Date.

AIG SUNAMERICA LIFE ASSURANCE COMPANY

/s/ Christine A. Nixon                          /s/ Jana W. Greer
----------------------                          -----------------
  Christine A. Nixon                              Jana W. Greer
      Secretary                                      President

                                       5Number           SHARES OF COMMON STOCK               CUSIP  37944Q 10 3
GSL              PAR VALUE $0.01                      SEE REVERSE FOR CERTAIN
                                                      RESTRICTIONS
                 THIS CERTIFICATE IS
                 TRANSFERABLE IN NEW YORK, NY

                               GLOBAL SIGNAL INC.
           A REAL ESTATE INVESTMENT TRUST ORGANIZED UNDER THE LAWS OF
                             THE STATE OF DELAWARE

                  THIS CERTIFIES THAT

                  IS THE OWNER OF

                  FULLY-PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK, PAR
                  VALUE $0.01 OF

         GLOBAL SIGNAL INC., transferable on the books of the Corporation by the
         holder hereof in person or by duly authorized attorney, upon surrender
         of this Certificate properly endorsed. This Certificate and the shares
         represented hereby are issued and shall be held subject to all of the
         provisions of the Certificate of Incorporation of the Corporation and
         all amendments thereto, to all of which the holder, by acceptance
         hereof, assents. This Certificate is not valid until countersigned and
         registered by the Transfer Agent and Registrar.

                  Witness the facsimile seal of the Corporation and the
         facsimile signatures of its duly authorized officers.

Dated:

/s/ Wesley R. Edens
-------------------------         [SEAL]      COUNTERSIGNED AND REGISTERED:
CHAIRMAN OF THE BOARD AND                         AMERICAN STOCK TRANSFER & TRUST COMPANY
CHIEF EXECUTIVE OFFICER                                (NEW YORK, NY)      TRANSFER AGENT AND REGISTRAR
                                              BY
                                                                    AUTHORIZED SIGNATURE
/s/ Stephen W. Crawford
-----------------------
       SECRETARY

                               GLOBAL SIGNAL INC.

        The Corporation will furnish to any stockholder upon request and without
charge a full statement of the designations, preferences, conversion and other
rights, voting powers, restrictions, limitations as to dividends,
qualifications, and terms and conditions of redemption of shares of each class
authorized to be issued and, with respect to the classes of shares which may be
issued in series, the differences in the relative rights and preferences between
the shares of each series, to the extent they have been set. Such request may be
made to the Secretary of the Corporation at its principal office or to the
Transfer Agent.

         The shares represented by this certificate are subject to certain
ownership limitations and restrictions on transfer, as provided in the
Certificate of Incorporation of the Corporation, and subject to such terms,
conditions and exceptions as set forth therein. A copy of the Certificate of
Incorporation of the Corporation may be obtained from the Corporation without
charge. A violation of these provisions could result in the shares represented
hereby being transferred to a trust for the benefit of a charitable beneficiary,
or in a purported sale or other transfer of these shares being void.

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

TEN COM - as tenants in common                   UNIF TRANS MIN ACT- __________
TEN ENT - as tenants by the entireties                                 (Cust)
JT TEN -  as joint tenants with right of
          survivorship and not as tenants        Custodian ____________________
          in common                                              (Minor)
                                                 under Uniform Gifts/
                                                 Transfers to Minors Act
                                                 ____________________________
                                                          (State)

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

FOR VALUE RECEIVED, ___________________________________________
HEREBY SELL, ASSIGN AND TRANSFER UNTO

PLEASE INSERT SOCIAL SECURITY OR OTHER
          IDENTIFYING NUMBER OF ASSIGNEE

------------------------------------------------------------------------
   (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

_________________________________________________________________ shares of the
Common Stock represented by the within Certificate, and do hereby irrevocably
constitute and appoint ___________________________ Attorney to transfer the said
shares on the books of the within named Corporation with full power of
substitution in the premises.

Dated: _______________              ________________________________________
                                    NOTICE: The Signature(s) to This
                                    Assignment Must Correspond With The
                                    Name(s) As Written Upon The Face Of
                                    The Certificate In Every Particular,
                                    Without Alteration Or Enlargement Or
                                    Any Change Whatever.

         SIGNATURE(S) GUARANTEED:    _________________________________
                                     THE SIGNATURE(S) MUST BE GUARANTEED BY AN
                                     ELIGIBLE GUARANTOR INSTITUTION (BANKS,
                                     STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS
                                     AND CREDIT UNIONS WITH MEMBERSHIP IN AN
                                     APPROVED SIGNATURE GUARANTEE MEDALLION
                                     PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15.

KEEP THIS CERTIFICATE IN A SAFE PLACE. IF IT IS LOST, STOLEN, MUTILATED OR
DESTROYED, THE CORPORATION WILL REQUIRE A BOND OF INDEMNITY AS A CONDITION TO
THE ISSUANCE OF A REPLACEMENT CERTIFICATE.

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