Document:

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                                                                   Exhibit 10.4

                                 PROMISSORY NOTE

$____________                                                     August 6, 1999

               FOR VALUE RECEIVED, [______________], ("Maker"), hereby
unconditionally promises to pay to the order of Bentley Systems, Incorporated, a
Delaware corporation ("Payee"), on the earlier of August 6, 2004 (the "Maturity
Date"), the date specified in paragraph 5 below or upon the demand of the holder
subsequent to an Event of Default (as defined in the Stock Pledge Agreement
between Maker and Payee of even date herewith (the "Stock Pledge Agreement")),
the principal amount of [___________] Dollars ($____________), together with
interest on the outstanding principal balance hereof from time to time
outstanding from the date hereof and until this Note is paid in full, whether
before or after maturity, at the rate of six percent (6%) per annum, and, to the
extent lawful, to pay interest at the same rate on any overdue installment of
interest.

1.   Interest shall be calculated on the basis of actual days elapsed and a year
of 365 days and shall be paid on the business day coincident with or first
following August 6, 2000 and August 6 of each year (or partial year) thereafter.

2.   Payments of principal and interest shall be made in lawful money of the
United States of America by cash or check at Bentley Systems, Incorporated, 690
Pennsylvania Drive, Exton, PA 19341 or at such other place as the holder of this
Note shall designate to Maker in writing.

3.   Maker may prepay this Note in whole or in part at any time without premium
or penalty.

4.   This Note is the note referred to in, and is entitled to the benefits of,
and is secured as provided in, the Stock Pledge Agreement. Reference is hereby
made to such agreement for a description of the properties and assets in which a
security interest has been granted, the nature and extent of the security and
the rights of the holder of this Note in respect thereof.

5.   Upon the occurrence of any of the following events, all amounts payable
hereunder shall, without notice or demand, become due and payable at such times
as are indicated below, and the holder shall thereupon have all rights and
remedies provided hereunder, in any other agreement between Payee and Maker or
otherwise available at law or in equity:

         (a) In the event Maker's employment with Payee terminates for any
reason (including death) prior to the Maturity Date, the outstanding principal
balance hereof, together with all accrued interest hereon, shall become due and
payable not later than 90 days following the date of termination.

         (b) In the event of a Change of Control of Payee, the outstanding
principal balance hereof, together with all accrued interest hereon, shall
become due and payable not later than 90 days following the Change of Control. A
"Change of Control" shall be deemed to have taken place if:

                                       1
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                    (1) any person or entity, including a "group" (within the
         meaning of Rule 13d-1 under the Securities Exchange Act of 1934, as
         amended (the "Exchange Act")) but excluding Payee or any stockholder of
         Payee as of the date of this Agreement who are part of a "group" that
         controls Payee as of the date hereof, becomes the beneficial owner of
         shares of Payee having 50 percent or more of the total number of votes
         that may be cast for the election of directors of Payee;

                    (2) there occurs any cash tender or exchange offer for
         shares of Payee, merger or other business combination involving Payee,
         or sale of all or substantially all of the assets of Payee, or any
         combination of the foregoing transactions, and as a result of or in
         connection with any such event persons who were directors of Payee
         before the event shall cease to constitute a majority of the Board of
         Directors of Payee or any successor to Payee; or

                    (3) during any period of two consecutive calendar years
         beginning after the date of the initial public offering of the common
         stock of Payee, members of the Incumbent Board cease for any reason to
         constitute a majority of the Board. For this purpose, the "Incumbent
         Board" shall consist of the individuals who at the beginning of such
         period constitute the entire Board and any new director - other than a
         director (i) designated or nominated by, or affiliated with, a person
         who has entered into an agreement with Payee to effect a transaction
         described in (2) above, or (ii) who initially assumed office as result
         of either an actual or threatened "Election Contest" (as described in
         Rule 14a-11 under the Exchange Act), or other actual or threatened
         solicitation of proxies or contest by or on behalf of a person other
         than the Board (a "Proxy Contest"), including by reason of any
         agreement intended to avoid or settle any Election Contest or Proxy
         Contest - whose election by the Board or nomination for election by the
         stockholders of Payee was approved by a vote of at least 2/3rds of the
         directors then still in office who either were directors at the
         beginning of the period or whose election or nomination for election
         was previously so approved.

                    (4) As used in (1), (2), and (3) above, the terms "person"
         and "beneficial owner" have the same meaning as such terms under
         Section 13(d) of the Exchange Act and the rules and regulations
         promulgated thereunder.

                (c) Initial Public Offering. In the event of an initial public
offering of equity securities of Payee which is registered under the Securities
Act of 1933, as amended, the outstanding principal balance hereof, together with
all accrued interest hereon, shall become due and payable no later than six
months following the initial public offering.

6. No failure or delay on the part of the holder to insist on strict performance
of Maker's obligations hereunder or to exercise any remedy shall constitute a
waiver of the holder's rights in that or any other instance. No waiver of any of
the holder's rights shall be effective unless in writing, and any waiver of any
default or any instance of non-compliance shall be limited to its express terms
and shall not extend to any other default or instance of non-compliance.

                                       2
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7. Maker and each endorser hereby waives presentment, notice of nonpayment or
dishonor, protest, notice of protest and all other notices in connection with
the delivery, acceptance, performance, default or enforcement of payment of this
Note, and hereby waives all notice or right of approval of any extensions,
renewals, modifications or forbearances which may be allowed.

8. Any proceeding relating to this Note may be instituted in any federal court
in the Eastern District of Pennsylvania or any state court located in Chester
County in the Commonwealth of Pennsylvania and Maker irrevocably submits to the
nonexclusive jurisdiction of any such court and waives any objection Maker may
have to the conduct of any proceeding in any such court based on improper venue
or forum non conveniens. Because of the greater time and expense required
therefor, Maker hereby waives, to the extent permitted by law, a trial by jury.

9. Maker shall pay all reasonable costs and expenses (including attorneys' fees)
incurred by the holder relating to the enforcement of this Note.

10. Any provision hereof found to be illegal, invalid or unenforceable for any
reason whatsoever shall not affect the validity, legality or enforceability of
the remainder hereof.

11. If the effective interest rate on this Note would otherwise violate any
applicable usury law, then the interest rate shall be reduced to the maximum
permissible rate and any payment received by the holder in excess of the maximum
permissible rate shall be treated as a prepayment of the principal of this Note.

12. This Note shall be binding upon Maker's heirs, personal representatives and
assigns and shall inure to the benefit of each holder of this Note and such
holder's heirs, personal representatives, successors, endorsees and assigns.

13. This Note has been delivered in the Commonwealth of Pennsylvania and shall
be governed by the laws of that Commonwealth.

           IN WITNESS WHEREOF, the undersigned, intending to be legally bound,
has duly executed and delivered this instrument.

                                                          By:
                                                             -------------------
                                                             [-----------------]

<PAGE>
                          Schedule of Promissory Notes

     The following schedule identifies the individuals that have executed
Promissory Notes, dated August 6, 1999, payable to Bentley Systems,
Incorporated, and the original principal amounts of those Notes.

<Table>
<Caption>
                                         Principal Amount of
    Name:                                Promissory Note
    -----                                --------------------
<S>                                      <C>

    Barry J. Bentley                     $1,142,221

    Gregory S. Bentley                   $1,142,225

    Keith A. Bentley                     $1,142,221

    Raymond B. Bentley                   $571,111

    Richard P. Bentley                   $571,111

    David G. Nation                      $571,111
</Table><PAGE>

                                                                   EXHIBIT 10.5

           THIS SECURED NOTE IS SUBJECT TO THE TERMS OF THE STANDSTILL
             AGREEMENT, DATED AS OF DECEMBER 26, 2000, BY INTERGRAPH
CORPORATION IN FAVOR OF PNC BANK, NATIONAL ASSOCIATION, FOR ITSELF AND AS AGENT

                                  SECURED NOTE

                                                             Huntsville, Alabama
                                                          Date: December 1, 2000

         FOR VALUE RECEIVED, Bentley Systems, Incorporated, a Delaware
corporation ("Borrower"), promises to pay to the order of Intergraph
Corporation, a Delaware corporation, at its principal place of business at One
Madison Industrial Park, Huntsville, Alabama 35894-0001 for itself and on behalf
of the other Selling Entities under the Asset Purchase Agreement described below
("Payee"), or its assigns, in lawful money of the United States of America and
in immediately available funds, the sum of Eleven Million Eighty-seven Thousand
One Hundred Twelve and no/100 Dollars ($11,087,112.00), as adjusted in
accordance with the terms hereof, plus an amount equal to the RMR Principal (as
defined herein), together with all other amounts payable hereunder.

         Borrower further promises to pay interest at such address in like
money, from the date hereof on the outstanding principal amount owing hereunder
from time to time, at a rate per annum equal to nine and one-half percent (9.5%)
per annum. Such interest shall be computed daily on the basis of a 360-day year
and for the actual number of days elapsed. In no event shall interest hereunder
exceed the maximum rate under applicable law.

         This note is delivered pursuant to the Asset Purchase Agreement by and
among Borrower, Payee and the other parties thereto dated as of December 26,
2000 (the "Asset Purchase Agreement"). Capitalized terms used but not defined
herein have the meanings given them in the Asset Purchase Agreement.

         On March 1, 2001, the principal balance owing under this Note shall, as
applicable, be increased or decreased so as to equal one and one-half (1.5)
times the Transferred Maintenance Revenues, such adjustment to be effective as
of the date of this Note (any increase in such principal amount being referred
to as the "Additional Principal"). If an adjustment to the principal balance of
this Note occurs pursuant to the terms of the Asset Purchase Agreement on June
1, 2001, the principal balance owed under this Note shall, as applicable, be
increased or decreased so as to equal one
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and one-half (1.5) times the Transferred Maintenance Revenues, such adjustment
to be effective as of the date of this Note. On February 1, 2002 the principal
balance owing under this note shall be increased by an amount equal to one and
one-half (1.5) times the Renewed Maintenance Revenues (the "RMR Principal"),
such increase to be effective as of December 1, 2001.

         Payments of principal and interest hereunder shall be made quarterly,
on the first business day of each March, June, September and December after the
date hereof until the maturity date. All principal, interest and other amounts
owing hereunder shall be due and payable in full on December 1, 2003.

         The amount of the first four (4) quarterly payments of principal and
interest shall be One Million Seventy-three Thousand Nine Hundred Sixteen
Dollars ($1,073,916.00). The amount of the quarterly payments of principal and
interest after any adjustment made to the principal amount of this Note pursuant
to the Asset Purchase Agreement shall be equal to the amount necessary to
amortize the unpaid principal amount owing as of the date of any such
adjustment, together with interest thereon at the rate provided herein, over the
remaining quarterly periods by making equal payments of principal and interest
on the dates provided for herein.

         Borrower may prepay any amount then owing hereunder, in whole or in
part, at any time, but if less than all, must do so in principal amount
increments of 1,000,000; provided however, that Borrower may not prepay any of
the Additional Principal or the RMR Principal prior to the time it has been
determined hereunder.

         This Note is the "Note" referred to in the Security Agreement and
Borrower's obligations hereunder are secured thereby.

         Borrower agrees that if (i) Borrower fails to pay, in accordance with
the terms of this Note, any principal or interest within five (5) days after
written notice from Payee that such amount remains unpaid following the date
that such sum is due, or (ii) there is an Event of Default under the Security
Agreement; then in any such event (each an "Event of Default") all amounts then
remaining unpaid hereunder shall, at the option of Payee upon written notice to
Borrower, be immediately due and payable.

         Upon the occurrence of an Event of Default and acceleration of the
obligations as provided above, Payee may pursue any remedy available under this
Note or available at law or in equity. No right or remedy conferred upon Payee
in this Note, the Asset Purchase Agreement or the Security Agreement is intended
to be exclusive of any other right or remedy contained in this Note, the Asset
Purchase Agreement or the Security Agreement and every such right or remedy
shall be cumulative in addition to every other right or remedy contained herein
or therein or now or hereafter available to Payee at law, in equity or
otherwise.

                                      -2-
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         Except to the extent expressly provided herein to the contrary, all
amounts payable by Borrower hereunder shall be due and payable without notice of
default, presentment or demand for payment, protest or further notice of
nonpayment or dishonor, or notices or demands of any kind, all of which are
expressly waived by Borrower.

         The invalidity, illegality or unenforceability of any provision of this
Note will not affect any other provision of this Note, all of which shall remain
in full force and effect, nor will the invalidity, illegality, or
unenforceability of a portion of any provision of this Note affect the balance
of such provision. In the event that any one or more of the provisions contained
in this Note or any portion thereof shall for any reason be held to be invalid,
illegal or unenforceable in any respect, this Note shall be reformed, construed
and enforced as if such invalid, illegal or unenforceable provision had never
been contained herein.

         No failure of Payee in any one or more instances to insist upon strict
compliance by Borrower with the terms and conditions of this Note or to enforce
any right hereunder or otherwise shall be deemed a waiver of any obligation of
Borrower or right of Payee with respect to any failure of Borrower to comply
with the terms and conditions hereof. This Note may be modified or canceled only
by the written agreement of Borrower and Payee.

         Borrower and Payee acknowledge that, pursuant to Section 10.5 of the
Asset Purchase Agreement, (i) Borrower's obligations hereunder may be subject to
certain rights of set-off, and (ii) Payee may hereafter be entitled to set-off
certain amounts to be owing by Payee to Borrower against amounts owing by
Borrower hereunder.

         All notices, demands and other communications to Borrower or Payee
under this Note shall be in writing and shall be effective if (i) sent by
registered or certified mail, postage prepaid, return receipt requested, or (ii)
sent by overnight delivery via a nationally recognized overnight delivery
service or by facsimile transmission (provided that in the case of (ii), a copy
is also sent as provided in (i). All notices shall be addressed as set forth
below or to such other address as a party may by written notice to the other
party have designated for such purpose. Any such notice, demand or other
communication shall be deemed given upon the earlier of actual receipt or five
(5) days after being deposited in the U.S. mail if sent by registered or
certified mail.

                                      -3-
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         Borrower's address:       Bentley Systems, Incorporated
                                   690 Pennsylvania Avenue
                                   Exton, Pennsylvania  19341
                                   Attn:  David G. Nation,
                                          Senior Vice President and
                                          General Counsel
                                   Facsimile No.:  (610) 458-3181

         Payee's address:          Intergraph Corporation
                                   Huntsville, Alabama  35894-0001
                                   Attn:  John W. Wilhoite
                                   Facsimile No.:  (256) 730-2048

This Note has been delivered to and accepted by Payee in the State of Alabama.
This Note and the rights and obligations of Borrower and Payee hereunder shall
be governed by and construed and enforced in accordance with the internal laws
of the State of Alabama without regard to principles of conflicts of law.
Borrower hereby waives any right to trial by jury in any legal proceeding
related in any way to this Note and agrees that any such proceeding may, if
Payee so elects, be brought, transferred to and enforced in the courts of the
State of Alabama or the United States District Court for the Northern District
of Alabama, and Borrower hereby waives any objection to jurisdiction or venue in
any such proceeding commenced in any of such courts. Borrower further agrees
that any process required to be served on it for purposes of any such proceeding
may be served on it, with the same effect as personal service on it within the
State of Alabama, by registered mail addressed to it at its address for purposes
of notices as provided above.

                                          BENTLEY SYSTEMS, INCORPORATED

                                          By: /s/ David G. Nation
                                             ----------------------------------
                                              David G. Nation
                                              Senior Vice President

                                      -4-

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