Document:

SECURITY AGREEMENT

     SECURITY  AGREEMENT,  dated as of June 22, 2000,  between  ACCORD  ADVANCED
TECHNOLOGIES,  INC.,  a Nevada  corporation  (the  "COMPANY"),  and the  secured
parties signatory hereto and their respective endorsees, transferees and assigns
(Collectively, the "SECURED PARTY").

                                  WITNESSETH:

     WHEREAS,  pursuant to a Secured  Convertible  Debenture Purchase Agreement,
dated the date hereof  between the Company and the Secured Party (the  "PURCHASE
AGREEMENT"),  the  Company  has  agreed  to issue to the  Secured  Party and the
Secured  Party has agreed to purchase  from the Company an  aggregate  principal
amount of $1,000,000 of the Company's 12% Secured  Convertible  Debentures,  due
June 30,  2001 (the  "DEBENTURES"),  which are  convertible  into  shares of The
Company's  Common  Stock,  $.001 par value (the "COMMON  STOCK").  In connection
therewith,  the Company shall issue to the Secured Party a certain  Common Stock
purchase  warrant  of even date  herewith  to  purchase  the number of shares of
Common Stock indicated below each Secured Party's name on the Purchase Agreement
(the "WARRANTS"); and

     WHEREAS,  in order to induce the Secured Party to purchase the  Debentures,
the  Company  has  agreed to  execute  and  deliver  to the  Secured  Party this
Agreement  for the  benefit of the  Secured  Party and to grant to it a security
interest  in certain  property  of the  Company  to secure  the prompt  payment,
performance and discharge in full of all of the Company's  obligations under the
Debentures  and the  exercise  and  discharge  in  full of all of the  Company's
obligations under the Warrant.

     NOW, THEREFORE, in consideration of the agreements herein contained and for
other good and valuable  consideration,  the receipt and sufficiency of which is
hereby acknowledged, the parties hereto hereby agree as follows:

     1. CERTAIN  DEFINITIONS.  As used in this  Agreement,  the following  terms
shall  have  the  meanings  set  forth in this  Section  1.  Terms  used but not
otherwise  defined in this  Agreement  that are  defined in Article 9 of the UCC
(such as  "GENERAL  INTANGIBLES"  and  "PROCEEDS")  shall  have  the  respective
meanings given such terms in Article 9 of the UCC.

          (a)  "COLLATERAL"  means the  collateral in which the Secured Party is
granted a security  interest  by this  Agreement  and which  shall  include  the
following,  whether presently owned or existing or hereafter  acquired or coming
into existence,  and all additions and accessions  thereto and all substitutions
and  replacements  thereof,  and all  proceeds,  products and accounts  thereof,
including,  without  limitation,  all proceeds  from the sale or transfer of the
Collateral  and of  insurance  covering  the  same  and of any  tort  claims  in
connection therewith:
<PAGE>
               (i) All Goods of the Company, including, without limitations, all
               machinery,  equipment,  computers, motor vehicles, trucks, tanks,
               boats, ships, appliances,  furniture,  special and general tools,
               fixtures, test and quality control devices and other equipment of
               every kind and nature and wherever  situated,  together  with all
               documents  of title and  documents  representing  the  same,  all
               additions and  accessions  thereto,  replacements  therefor,  all
               parts therefor,  and all substitutes for any of the foregoing and
               all other items used and useful in connection  with the Company's
               businesses  and  all  improvements  thereto  (collectively,   the
               "EQUIPMENT"); and

               (ii) All Inventory of the Company; and

               (iii)  All  of  the   Company's   contract   rights  and  general
               intangibles,   including,  without  limitation,  all  partnership
               interests, stock or other securities,  licenses, distribution and
               other agreements,  computer software development rights,  leases,
               franchises,  customer lists,  quality control procedures,  grants
               and rights,  goodwill,  trademarks,  service marks, trade styles,
               trade names, patents,  patent applications,  copyrights,  deposit
               accounts,  and income tax  refunds  (collectively,  the  "GENERAL
               INTANGIBLES"); and

               (iv) All  Receivables  of the  Company  including  all  insurance
               proceeds,  and rights to refunds  or  indemnification  whatsoever
               owing,  together  with all  instruments,  all  documents of title
               representing   any  of  the   foregoing,   all   rights   in  any
               merchandising,  goods, equipment, motor vehicles and trucks which
               any of the same may represent, and all right, title, security and
               guaranties with respect to each  Receivable,  including any right
               of stoppage in transit; and

               (v)  All of the  Company's  documents,  instruments  and  chattel
               paper,  files,  records,  books  of  account,   business  papers,
               computer  programs  and the  products  and proceeds of all of the
               foregoing Collateral set forth in clauses (i)-(iv) above.

          (b)  "COMPANY"  shall mean,  collectively,  the Company and all of the
subsidiaries  of the  Company,  a list of  which is  contained  in  SCHEDULE  A,
attached hereto.

          (c)  "OBLIGATIONS"  means all of the Company's  obligations under this
Agreement,  the  Debentures  and the  Warrant,  in  each  case,  whether  now or
hereafter existing,  voluntary or involuntary,  direct or indirect,  absolute or
contingent, liquidated or unliquidated, whether or not jointly owed with others,
and  whether  or not from  time to time  decreased  or  extinguished  and  later
decreased,  created or incurred,  and all or any portion of such  obligations or
liabilities  that are paid,  to the  extent  all or any part of such  payment is
avoided  or  recovered  directly  or  indirectly  from  the  Secured  Party as a
preference, fraudulent transfer or otherwise as such obligations may be amended,
supplemented, converted, extended or modified from time to time.

                                       -2-
<PAGE>
          (d) "UCC" means the Uniform Commercial Code, as currently in effect in
the State of Nevada.

     2. GRANT OF SECURITY  INTEREST.  As an inducement  for the Secured Party to
purchase  the  Debentures  and  to  secure  the  complete  and  timely  payment,
performance  and  discharge  in  full,  as  the  case  may  be,  of  all  of the
Obligations,  the Company  hereby,  unconditionally  and  irrevocably,  pledges,
grants and hypothecates to the Secured Party, a continuing security interest in,
a lien upon and a right of set-off against all of the Company's right, title and
interest of whatsoever  kind and nature in and to the Collateral  (the "SECURITY
INTEREST").  The Security Interest shall be subordinate to the lien and security
interest of the SBA Loan.

     3.  REPRESENTATIONS,  WARRANTIES,  COVENANTS AND AGREEMENTS OF THE COMPANY.
The Company  represents  and warrants  to, and  covenants  and agrees with,  the
Secured Party as follows:

          (a) The Company has the  requisite  corporate  power and  authority to
enter into this Agreement and otherwise to carry out its obligations thereunder.
The execution, delivery and performance by the Company of this Agreement and the
filings  contemplated  therein have been duly authorized by all necessary action
on the part of the Company and no further action is required by the Company.

          (b) The  Company  represents  and  warrants  that it has no  place  of
business or offices where its  respective  books of account and records are kept
(other than  temporarily  at the offices of its  attorneys  or  accountants)  or
places where Collateral is stored or located,  except as set forth on SCHEDULE A
attached hereto;

          (c) The  Company  is the sole  owner  of the  Collateral  (except  for
non-exclusive  licenses  granted  by the  Company  in  the  ordinary  course  of
business),  free and clear of any liens other than liens or  security  interests
granted in connection with the SBA Loan (as defined in the Purchase  Agreement),
encumbrances,  rights or claims,  and is fully  authorized to grant the Security
Interest  in and  to  pledge  the  Collateral.  There  is  not  on  file  in any
governmental or regulatory  authority,  agency or recording  office an effective
financing  statement,  security agreement,  license or transfer or any notice of
any of the  foregoing  (other  than  those  that have been filed in favor of the
Secured  Party  pursuant to this  Agreement)  covering or  affecting  any of the
Collateral.  So long as this Agreement shall be in effect, the Company shall not
execute  and shall  not  knowingly  permit  to be on file in any such  office or
agency any such financing  statement or other document or instrument  (except to
the extent filed or recorded in favor of the Secured Party pursuant to the terms
of this Agreement).

          (d)  No  part  of  the   Collateral   has  been   judged   invalid  or
unenforceable.  No written claim has been  received  that any  Collateral or the
Company's use of any  Collateral  violates the rights of any third party.  There
has been no adverse  decision to the Company's  claim of ownership  rights in or
exclusive  rights to use the Collateral in any  jurisdiction or to the Company's
right to keep and maintain such  Collateral in full force and effect,  and there
is no proceeding  involving said rights pending or, to the best knowledge of the
Company,   threatened  before  any  court,  judicial  body,   administrative  or
regulatory agency, arbitrator or other governmental authority.

                                       -3-
<PAGE>
          (e) The Company  shall at all times  maintain its books of account and
records  relating to the  Collateral at its principal  place of business and its
Collateral at the locations set forth on SCHEDULE A attached  hereto and may not
relocate  such books of account  and records or  tangible  Collateral  unless it
delivers  to the  Secured  Party at least 30 days prior to such  relocation  (i)
written notice of such  relocation  and the new location  thereof (which must be
within  the  United  States)  and  (ii)  evidence  that  appropriate   financing
statements and other necessary  documents have been filed and recorded and other
steps have been taken to perfect the Security Interest to create in favor of the
Secured  Party valid,  perfected  and  continuing  first  priority  liens in the
Collateral.

          (f) This  Agreement  creates  in favor  of the  Secured  Party a valid
security interest in the Collateral  securing the payment and performance of the
Obligations and, upon making the filings described in the immediately  following
sentence,  a perfected  first  priority  security  interest in such  Collateral.
Except for the filing of financing  statements  on Form-1 under the UCC with the
jurisdictions  indicated on SCHEDULE B, attached  hereto,  no  authorization  or
approval of or filing with or notice to any governmental authority or regulatory
body  is  required  either  (i)  for  the  grant  by  the  Company  of,  or  the
effectiveness  of, the Security  Interest  granted  hereby or for the execution,
delivery  and  performance  of this  Agreement  by the  Company  or (ii) for the
perfection  of or  exercise  by the  Secured  Party of its rights  and  remedies
hereunder.

          (g) On the date of  execution  of this  Agreement,  the  Company  will
deliver to the Secured Party one or more  executed UCC  financing  statements on
Form-1 with respect to the Security  Interest for filing with the  jurisdictions
indicated on SCHEDULE B, attached hereto and in such other  jurisdictions as may
be requested by the Secured Party.

          (h) The execution, delivery and performance of this Agreement does not
conflict with or cause a breach or default, or an event that with or without the
passage of time or  notice,  shall  constitute  a breach or  default,  under any
agreement to which the Company is a party or by the Company is bound. No consent
(including,  without limitation, from stock holders or creditors of the Company)
is required for the Company to enter into and perform its obligations hereunder.

          (i) The Company  shall at all times  maintain  the liens and  Security
Interest  provided for hereunder as valid and perfected first priority liens and
security  interests in the  Collateral  in favor of the Secured Party until this
Agreement  and the Security  Interest  hereunder  shall  terminated  pursuant to
Section 11. The  Company  hereby  agrees to defend the same  against any and all
persons.  The Company shall safeguard and protect all Collateral for the account
of the Secured Party. At the request of the Secured Party, the Company will sign
and  deliver to the  Secured  Party at any time or from time to time one or more
financing  statements  pursuant to the UCC (or any other applicable  statute) in
form  reasonably  satisfactory  to the  Secured  Party  and will pay the cost of
filing the same in all public  offices  wherever  filing is, or is deemed by the
Secured Party to be, necessary or desirable to effect the rights and obligations
provided for herein.  Without  limiting the  generality  of the  foregoing,  the
Company shall pay all fees,  taxes and other  amounts  necessary to maintain the

                                       -4-
<PAGE>
Collateral and the Security Interest hereunder, and the Company shall obtain and
furnish to the  Secured  Party from time to time,  upon  demand,  such  releases
and/or  subordinations of claims and liens which may be required to maintain the
priority of the Security Interest hereunder.

          (j) The Company  will not  transfer,  pledge,  hypothecate,  encumber,
license  (except  for  non-exclusive  licenses  granted  by the  Company  in the
ordinary course of business), sell or otherwise dispose of any of the Collateral
without the prior written consent of the Secured Party.

          (k) The Company shall keep and preserve its  Equipment,  Inventory and
other  tangible  Collateral  in good  condition,  repair and order and shall not
operate or locate any such  Collateral  (or cause to be  operated or located) in
any area excluded from insurance coverage.

          (l) The Company  shall,  within ten (10) days of  obtaining  knowledge
thereof,  advise the  Secured  Party  promptly,  in  sufficient  detail,  of any
substantial  change in the Collateral,  and of the occurrence of any event which
would have a material  adverse  effect on the value of the  Collateral or on the
Secured Party's security interest therein.

          (m) The  Company  shall  promptly  execute  and deliver to the Secured
Party such further deeds, mortgages, assignments, security agreements, financing
statements or other instruments, documents, certificates and assurances and take
such further  action as the Secured  Party may from time to time request and may
in its sole  discretion  deem  necessary  to  perfect,  protect or  enforce  its
security interest in the Collateral including, without limitation, the execution
and delivery of a separate  security  agreement  with  respect to the  Company's
intellectual property  ("INTELLECTUAL PROPERTY SECURITY AGREEMENT") in which the
Secured Party has been granted a security interest hereunder, substantially in a
form  acceptable to the Secured  Party,  which  Intellectual  Property  Security
Agreement,  other than as stated  therein,  shall be subject to all of the terms
and conditions hereof.

          (n) The Company shall permit the Secured Party and its representatives
and agents to inspect the  Collateral at any time, and to make copies of records
pertaining to the  Collateral as may be requested by the Secured Party from time
to time.

          (o) The Company will take all steps reasonably necessary to diligently
pursue and seek to preserve,  enforce and collect any rights,  claims, causes of
action and accounts receivable in respect of the Collateral.

          (p) The Company shall promptly  notify the Secured Party in sufficient
detail upon becoming aware of any  attachment,  garnishment,  execution or other
legal  process  levied  against  any  Collateral  and of any  other  information
received by the Company that may materially  affect the value of the Collateral,
the Security Interest or the rights and remedies of the Secured Party hereunder.

          (q) All information  heretofore,  herein or hereafter  supplied to the
Secured  Party by or on behalf of the Company with respect to the  Collateral is
accurate and complete in all material respects as of the date furnished.

                                       -5-
<PAGE>
          (r)  SCHEDULE  A,  attached  hereto  contains  a  list  of  all of the
subsidiaries of the Company.

     4. DEFAULTS. The following events shall be "EVENTS OF DEFAULT":

          (a)  The  occurrence  of an  Event  of  Default  (as  defined  in  the
Debentures) under the Debentures;

          (b) Any representation or warranty of the Company in this Agreement or
in the  Intellectual  Property  Security  Agreement  shall  prove  to have  been
incorrect in any material respect when made;

          (c) The  failure by the  Company  to  observe  or  perform  any of its
obligations  hereunder  for ten (10) days after receipt by the Company of notice
of such failure from the Secured Party; and

          (d) Any breach or default under the Warrant.

     5. DUTY TO HOLD IN TRUST.  Upon the  occurrence of any Event of Default and
at any time  thereafter,  the Company shall,  upon receipt by it of any revenue,
income or other sums subject to the Security Interest,  whether payable pursuant
to the Debentures or otherwise,  or of any check,  draft, note, trade acceptance
or other instrument  evidencing an obligation to pay any such sum, hold the same
in trust for the Secured Party and shall forthwith endorse and transfer any such
sums or  instruments,  or both,  to the  Secured  Party for  application  to the
satisfaction of the Obligations.

     6.  RIGHTS AND  REMEDIES  UPON  DEFAULT.  Upon  occurrence  of any Event of
Default and at any time  thereafter,  the Secured  Party shall have the right to
exercise all of the remedies  conferred  hereunder and under the  Debentures and
the Warrant,  and the Secured  Party shall have all the rights and remedies of a
secured  party  under the UCC and/or any other  applicable  law  (including  the
Uniform  Commercial  Code of any  jurisdiction  in which any  Collateral is then
located).  Without limitation, the Secured Party shall have the following rights
and powers:

          (a) The Secured  Party shall have the right to take  possession of the
Collateral  and, for that  purpose,  enter,  with the aid and  assistance of any
person,  any premises where the  Collateral,  or any part thereof,  is or may be
placed and remove the same,  and the Company shall  assemble the  Collateral and
make it available to the Secured  Party at places which the Secured  Party shall
reasonably  select,  whether at the Company's  premises or  elsewhere,  and make
available to the Secured Party,  without rent,  all of the Company's  respective
premises and facilities  for the purpose of the Secured Party taking  possession
of, removing or putting the Collateral in saleable or disposable form.

          (b) The Secured  Party shall have the right to operate the business of
the Company using the Collateral and shall have the right to assign, sell, lease
or otherwise dispose of and deliver all or any part of the Collateral, at public
or private  sale or  otherwise,  either with or without  special  conditions  or

                                       -6-
<PAGE>
stipulations,  for cash or on credit or for future  delivery,  in such parcel or
parcels  and at such time or times and at such  place or  places,  and upon such
terms and conditions as the Secured Party may deem commercially reasonable,  all
without (except as shall be required by applicable statute and cannot be waived)
advertisement  or demand upon or notice to the Company or right of redemption of
the Company,  which are hereby  expressly  waived.  Upon each such sale,  lease,
assignment  or other  transfer  of  Collateral,  the Secured  Party may,  unless
prohibited by applicable law which cannot be waived, purchase all or any part of
the Collateral being sold, free from and discharged of all trusts, claims, right
of redemption and equities of the Company, which are hereby waived and released.

     7. APPLICATIONS OF PROCEEDS.  The proceeds of any such sale, lease or other
disposition of the Collateral  hereunder shall be applied first, to the expenses
of retaking,  holding, storing,  processing and preparing for sale, selling, and
the like  (including,  without  limitation,  any  taxes,  fees and  other  costs
incurred  in  connection  therewith)  of  the  Collateral,   to  the  reasonable
attorneys'  fees and expenses  incurred by the Secured  Party in  enforcing  its
rights hereunder and in connection with collecting, storing and disposing of the
Collateral,  and then to satisfaction of the Obligations,  and to the payment of
any other  amounts  required by  applicable  law,  after which the Secured Party
shall pay to the  Company any surplus  proceeds.  If, upon the sale,  license or
other  disposition of the Collateral,  the proceeds  thereof are insufficient to
pay all amounts to which the Secured Party is legally entitled, the Company will
be liable for the deficiency, together with interest thereon, at the rate of 17%
per  annum  (the  "DEFAULT  RATE"),  and the  reasonable  fees of any  attorneys
employed  by the  Secured  Party  to  collect  such  deficiency.  To the  extent
permitted by applicable law, the Company waives all claims,  damages and demands
against the Secured Party arising out of the repossession, removal, retention or
sale of the Collateral, unless due to the gross negligence or willful misconduct
of the Secured Party.

     8. COSTS AND EXPENSES.  The Company agrees to pay all  out-of-pocket  fees,
costs and expenses  incurred in connection with any filing  required  hereunder,
including without limitation, any financing statements, continuation statements,
partial releases and/or  termination  statements related thereto or any expenses
of any searches reasonably required by the Secured Party. The Company shall also
pay all other claims and charges which in the reasonable  opinion of the Secured
Party  might  prejudice,  imperil  or  otherwise  affect the  Collateral  or the
Security  Interest  therein.  The Company  will also,  upon  demand,  pay to the
Secured  Party the  amount of any and all  reasonable  expenses,  including  the
reasonable fees and expenses of its counsel and of any experts and agents, which
the  Secured  Party may incur in  connection  with (i) the  enforcement  of this
Agreement, (ii) the custody or preservation of, or the sale of, collection from,
or other  realization  upon,  any of the  Collateral,  or (iii) the  exercise or
enforcement  of any of the rights of the  Secured  Party  under the  Debentures.
Until so paid, any fees payable hereunder shall be added to the principal amount
of the Debentures and shall bear interest at the Default Rate.

     9.  RESPONSIBILITY FOR COLLATERAL.  The Company assumes all liabilities and
responsibility  in connection  with all  Collateral,  and the obligations of the
Company  hereunder or under the  Debentures  and the Warrant  shall in no way be
affected or  diminished by reason of the loss,  destruction,  damage or theft of
any of the Collateral or its unavailability for any reason.

                                       -7-
<PAGE>
     10.  SECURITY  INTEREST  ABSOLUTE.  All rights of the Secured Party and all
Obligations  of the  Company  hereunder,  shall be absolute  and  unconditional,
irrespective of: (a) any lack of validity or  enforceability  of this Agreement,
the Debentures, the Warrant or any agreement entered into in connection with the
foregoing,  or any portion hereof or thereof; (b) any change in the time, manner
or place of  payment or  performance  of, or in any other term of, all or any of
the  Obligations,  or any other  amendment  or waiver of or any  consent  to any
departure from the Debentures,  the Warrant or any other agreement  entered into
in connection with the foregoing; (c) any exchange,  release or nonperfection of
any of the  Collateral,  or any release or  amendment or waiver of or consent to
departure from any other collateral for, or any guaranty, or any other security,
for all or any of the  Obligations;  (d) any  action  by the  Secured  Party  to
obtain, adjust, settle and cancel in its sole discretion any insurance claims or
matters  made or arising in  connection  with the  Collateral;  or (e) any other
circumstance  which might  otherwise  constitute any legal or equitable  defense
available  to the  Company,  or a discharge  of all or any part of the  Security
Interest  granted  hereby.  Until  the  Obligations  shall  have  been  paid and
performed in full,  the rights of the Secured  Party shall  continue even if the
Obligations  are barred  for any  reason,  including,  without  limitation,  the
running of the statute of  limitations  or  bankruptcy.  The  Company  expressly
waives presentment, protest, notice of protest, demand, notice of nonpayment and
demand  for  performance.  In the  event  that at any time any  transfer  of any
Collateral  or any  payment  received by the Secured  Party  hereunder  shall be
deemed  by final  order  of a court of  competent  jurisdiction  to have  been a
voidable preference or fraudulent  conveyance under the bankruptcy or insolvency
laws of the United  States,  or shall be deemed to be otherwise due to any party
other than the Secured Party, then, in any such event, the Company's obligations
hereunder  shall  survive  cancellation  of this  Agreement,  and  shall  not be
discharged or satisfied by any prior payment thereof and/or cancellation of this
Agreement,  but  shall  remain a valid and  binding  obligation  enforceable  in
accordance with the terms and provisions hereof. The Company waives all right to
require the Secured  Party to proceed  against any other  person or to apply any
Collateral  which the Secured Party may hold at any time, or to marshal  assets,
or to pursue any other remedy.  The Company waives any defense arising by reason
of the  application  of the statute of  limitations  to any  obligation  secured
hereby.

     11. TERM OF  AGREEMENT.  This  Agreement  and the Security  Interest  shall
terminate on the date on which all payments under the Debentures  have been made
in full and all  other  Obligations  have  been  paid or  discharged.  Upon such
termination,  the  Secured  Party,  at the  request  and at the  expense  of the
Company,  will join in executing any  termination  statement with respect to any
financing statement executed and filed pursuant to this Agreement.

     12. POWER OF ATTORNEY;  FURTHER ASSURANCES.  (a) The Company authorizes the
Secured  Party,  and does  hereby  make,  constitute  and  appoint  it,  and its
respective  officers,   agents,   successors  or  assigns  with  full  power  of
substitution, as the Company's true and lawful attorney-in-fact,  with power, in
its own name or in the name of the Company,  to, after the occurrence and during
the continuance of an Event of Default, (i) endorse any notes,  checks,  drafts,
money orders, or other instruments of payment (including  payments payable under
or in respect of any policy of insurance) in respect of the Collateral  that may
come into  possession  of the  Secured  Party;  (ii) to sign and endorse any UCC
financing  statement or any invoice,  freight or express  bill,  bill of lading,
storage  or   warehouse   receipts,   drafts   against   debtors,   assignments,
verifications  and notices in  connection  with  accounts,  and other  documents

                                       -8-
<PAGE>
relating to the Collateral;  (iii) to pay or discharge  taxes,  liens,  security
interests or other  encumbrances  at any time levied or placed on or  threatened
against the Collateral; (iv) to demand, collect, receipt for, compromise, settle
and sue for monies due in respect of the Collateral;  and (v) generally,  to do,
at the option of the Secured Party, and at the Company's  expense,  at any time,
or from  time to  time,  all acts and  things  which  the  Secured  Party  deems
necessary to protect,  preserve and realize upon the Collateral and the Security
Interest  granted therein in order to effect the intent of this  Agreement,  the
Debentures and the Warrant all as fully and  effectually as the Company might or
could do; and the Company hereby  ratifies all that said attorney shall lawfully
do or cause to be done by virtue hereof.  This power of attorney is coupled with
an  interest  and  shall  be  irrevocable  for the  term of this  Agreement  and
thereafter as long as any of the Obligations shall be outstanding.

          (b)  On  a  continuing   basis,   the  Company  will  make,   execute,
acknowledge,  deliver, file and record, as the case may be, in the proper filing
and recording places in any jurisdiction,  including,  without  limitation,  the
jurisdictions  indicated on SCHEDULE B, attached hereto,  all such  instruments,
and take all such action as may reasonably be deemed necessary or advisable,  or
as reasonably  requested by the Secured Party, to perfect the Security  Interest
granted  hereunder  and  otherwise  to carry out the intent and purposes of this
Agreement,  or for assuring  and  confirming  to the Secured  Party the grant or
perfection of a security interest in all the Collateral.

          (c) The Company hereby  irrevocably  appoints the Secured Party as the
Company's  attorney-in-fact,  with full  authority in the place and stead of the
Company and in the name of the Company, from time to time in the Secured Party's
discretion,  to take any action and to execute any instrument  which the Secured
Party may deem  necessary  or  advisable  to  accomplish  the  purposes  of this
Agreement,  including  the  filing,  in its  sole  discretion,  of  one or  more
financing or continuation statements and amendments thereto,  relative to any of
the Collateral without the signature of the Company where permitted by law.

     13.  NOTICES.  All  notices,  requests,  demands  and other  communications
hereunder shall be in writing,  with copies to all the other parties hereto, and
shall be deemed to have been duly  given  when (i) if  delivered  by hand,  upon
receipt,  (ii) if sent by facsimile,  upon receipt of proof of sending  thereof,
(iii) if sent by  nationally  recognized  overnight  delivery  service  (receipt
requested), the next business day or (iv) if mailed by first-class registered or
certified  mail,  return receipt  requested,  postage  prepaid,  four days after
posting in the U.S. mails, in each case if delivered to the following addresses:

     If to the Company:         5002 South Ash Avenue
                                Tempe, Arizona 85282
                                Facsimile No.: (480) 820-2319
                                Attn: Chief Financial Officer

                                       -9-
<PAGE>
     If to the Secured Party:   AJW Partners, LLC
                                155 First Street, Suite B
                                Mineola, NY, NY 11501
                                Facsimile No.: (516) 739-7115
                                Attn: Corey S. Ribotsky

                                and

                                New Millenium Capital Partners II, LLC
                                155 First Street, Suite B
                                Mineola, NY, NY 11501
                                Facsimile No.: (516) 739-7115
                                Attn: Glenn A. Arbeitman

     With copies to:            Robinson Silverman Pearce Aronsohn &
                                Berman LLP
                                1290 Avenue of the Americas
                                New York, NY  10104
                                Facsimile No.: (212) 541-4630
                                Attn: Eric L. Cohen. Esq.

     14. OTHER SECURITY. To the extent that the Obligations are now or hereafter
secured by property other than the  Collateral or by the guarantee,  endorsement
or property of any other person,  firm,  corporation  or other entity,  then the
Secured  Party  shall  have  the  right,  in its  sole  discretion,  to  pursue,
relinquish,  subordinate,  modify or take any other action with respect thereto,
without in any way modifying or affecting any of the Secured  Party's rights and
remedies hereunder.

     15. MISCELLANEOUS.

          (a) No course of dealing  between the  Company and the Secured  Party,
nor any failure to  exercise,  nor any delay in  exercising,  on the part of the
Secured Party, any right,  power or privilege  hereunder or under the Debentures
shall operate as a waiver thereof;  nor shall any single or partial  exercise of
any right,  power or  privilege  hereunder or  thereunder  preclude any other or
further exercise thereof or the exercise of any other right, power or privilege.

          (b) All of the rights and  remedies of the Secured  Party with respect
to the  Collateral,  whether  established  hereby or by the Debentures or by any
other agreements, instruments or documents or by law shall be cumulative and may
be exercised singly or concurrently.

          (c) This  Agreement  constitutes  the entire  agreement of the parties
with respect to the subject matter hereof and is intended to supersede all prior
negotiations,  understandings  and agreements  with respect  thereto.  Except as
specifically set forth in this Agreement,  no provision of this Agreement may be
modified or amended except by a written agreement specifically referring to this
Agreement and signed by the parties hereto.

                                      -10-
<PAGE>
          (d) In the event that any  provision  of this  Agreement is held to be
invalid,  prohibited or unenforceable in any jurisdiction for any reason, unless
such provision is narrowed by judicial construction, this Agreement shall, as to
such jurisdiction,  be construed as if such invalid, prohibited or unenforceable
provision  had been more narrowly  drawn so as not to be invalid,  prohibited or
unenforceable.   If,  notwithstanding  the  foregoing,  any  provision  of  this
Agreement  is  held  to  be  invalid,   prohibited  or   unenforceable   in  any
jurisdiction,  such provision, as to such jurisdiction,  shall be ineffective to
the  extent  of  such  invalidity,   prohibition  or  unenforceability   without
invalidating the remaining  portion of such provision or the other provisions of
this  Agreement  and without  affecting the validity or  enforceability  of such
provision or the other provisions of this Agreement in any other jurisdiction.

          (e) No  waiver of any  breach  or  default  or any  right  under  this
Agreement  shall be  considered  valid unless in writing and signed by the party
giving  such  waiver,  and no such  waiver  shall  be  deemed  a  waiver  of any
subsequent breach or default or right,  whether of the same or similar nature or
otherwise.

          (f) This  Agreement  shall be binding upon and inure to the benefit of
each party hereto and its successors and assigns.

          (g) Each party shall take such further  action and execute and deliver
such further  documents as may be necessary or appropriate in order to carry out
the provisions and purposes of this Agreement.

          (h) This Agreement  shall be construed in accordance  with the laws of
the  State of New  York,  except  to the  extent  the  validity,  perfection  or
enforcement  of a security  interest  hereunder  in  respect  of any  particular
Collateral which are governed by a jurisdiction other than the State of New York
in which case such law shall  govern.  Each of the  parties  hereto  irrevocably
submit to the  exclusive  jurisdiction  of any New York  State or United  States
Federal court sitting in Manhattan county over any action or proceeding  arising
out of or relating to this Agreement,  and the parties hereto hereby irrevocably
agree that all claims in respect of such action or  proceeding  may be heard and
determined  in such New York State or Federal  court.  The parties  hereto agree
that a final  judgment in any such action or proceeding  shall be conclusive and
may be enforced in other  jurisdictions  by suit on the judgment or in any other
manner  provided by law. The parties hereto further waive any objection to venue
in the State of New York and any  objection  to an action or  proceeding  in the
State of New York on the basis of forum non convenient.

          (i) EACH PARTY HERETO HEREBY AGREES TO WAIVE ITS RESPECTIVE  RIGHTS TO
A JURY TRAIL OF ANY CLAIM OR CAUSE OF ACTION  BASED UPON OR ARISING  OUT OF THIS
AGREEMENT.  THE SCOPE OF THIS WAIVER IS INTENDED TO BE ALL  ENCOMPASSING  OF ANY
DISPUTES  THAT MAY BE FILED IN ANY COURT AND THAT RELATE TO THE SUBJECT MATER OF
THIS AGREEMENT,  INCLUDING  WITHOUT  LIMITATION  CONTRACT  CLAIMS,  TORT CLAIMS,
BREACH OF DUTY CLAIMS AND ALL OTHER COMMON LAW AND STATUTORY CLAIMS.  EACH PARTY
HERETO  ACKNOWLEDGES THAT THIS WAIVER IS A MATERIAL INDUCEMENT FOR EACH PARTY TO

                                      -11-
<PAGE>
ENTER INTO A BUSINESS  RELATIONSHIP,  THAT EACH PARTY HAS ALREADY RELIED ON THIS
WAIVER IN ENTERING INTO THIS AGREEMENT AND THAT EACH PARTY WILL CONTINUE TO RELY
ON THIS WAIVER IN THEIR RELATED FUTURE DEALINGS. EACH PARTY FURTHER WARRANTS AND
REPRESENTS  THAT IT HAS REVIEWED  THIS WAIVER WITH ITS LEGAL  COUNSEL,  AND THAT
SUCH  PARTY HAS  KNOWINGLY  AND  VOLUNTARILY  WAIVES  ITS RIGHTS TO A JURY TRIAL
FOLLOWING  SUCH  CONSULTATION.   THIS  WAIVER  IS  IRREVOCABLE,   MEANING  THAT,
NOTWITHSTANDING  ANYTHING HEREIN TO THE CONTRARY,  IT MAY NOT BE MODIFIED EITHER
ORALLY OR IN WRITING, AND THIS WAIVER SHALL APPLY TO ANY SUBSEQUENT  AMENDMENTS,
RENEWALS AND SUPPLEMENTS OR MODIFICATIONS  TO THIS AGREEMENT.  IN THE EVENT OF A
LITIGATION,  THIS AGREEMENT MAY BE FILED AS A WRITTEN  CONSENT TO A TRIAL BY THE
COURT.

          (j) This Agreement may be executed in any number of counterparts, each
of which when so executed  shall be deemed to be an original  and,  all of which
taken together shall  constitute one and the same  Agreement.  In the event that
any  signature  is delivered by facsimile  transmission,  such  signature  shall
create a valid  binding  obligation  of the party  executing (or on whose behalf
such  signature is executed)  the same with the same force and effect as if such
facsimile signature were the original thereof.

                              * * * * * * * * * * *

                                      -12-
<PAGE>
     IN WITNESS WHEREOF,  the parties hereto have caused this Security Agreement
to be duly executed on the day and year first above written.

                                        ACCORD ADVANCED TECHNOLOGIES, INC.

                                        By: /s/ Travis Wilson
                                            ------------------------------------
                                            Name: Travis Wilson
                                            Title: Chief Executive

                                      -13-
<PAGE>
                                        AJW PARTNERS, LLC
                                        By: SMS Group, LLC

                                        By: /s/ Corey S. Ribotsky
                                            ------------------------------------
                                            Name: Corey S. Ribotsky
                                            Title:

                                      -14-
<PAGE>
                                        NEW MILLENNIUM CAPITAL PARTNERS II, LLC
                                        By: First Street Manager II, LLC

                                        By: /s/ Glenn A. Arbeitman
                                            ------------------------------------
                                            Name: Glenn A. Arbeitman
                                            Title:

                                      -15-
<PAGE>
                                   SCHEDULE A

PRINCIPAL PLACE OF BUSINESS OF THE COMPANY:

LOCATIONS WHERE COLLATERAL IS LOCATED OR STORED:

LIST OF SUBSIDIARIES OF THE COMPANY:

                                      -16-
<PAGE>
                                   SCHEDULE B

JURISDICTIONS:

                                      -17-<PAGE>   1
                                                                   Exhibit 10.10

                            SIXTH AMENDMENT TO LEASE

        This SIXTH AMENDMENT TO LEASE ("Sixth Amendment") is made and entered
into as of the 24th day of April, 2000 by and between WHLW REAL ESTATE LIMITED
PARTNERSHIP, a Delaware limited partnership ("Landlord"), and AUTODESK, INC., a
California corporation ("Tenant").

                                   RECITALS:

        WHEREAS, Tenant and Landlord's predecessor-in-interest, Connecticut
General Life Insurance Company, a Connecticut corporation ("CIGNA"), entered
into that certain Office Lease dated August 2, 1993 (the "Original Lease"), for
that certain premises specified in the Basic Lease Information attached to the
Original Lease, in the Marin Executive Center (the "Building") located at 4000
Civic Center Drive in the City of San Rafael, County of Marin, State of
California; and

        WHEREAS, Tenant and Cigna entered into that certain First Amendment to
Lease Agreement dated as of February 14, 1994 (the "First Amendment") whereby
certain Expansion Space was incorporated within the Demised Premises and the
measurements of the Initial Premises were revised; and

        WHEREAS, Tenant and Cigna entered into that certain Second Amendment to
Lease dated as of December 22, 1995 (the "Second Amendment"), whereby certain
additional Expansion Space was incorporated within the Demised Premises; and

        WHEREAS, Landlord has succeeded to the interest of Cigna under the
Lease, First Amendment and Second Amendment; and

        WHEREAS, Landlord and Tenant entered into that certain Third Amendment
to Lease dated as of December 27, 1996 (the "Third Amendment"), whereby certain
additional Expansion Space was incorporated within the Demised Premises and a
portion of the Demised Premises was removed from the Demised Premises; and

        WHEREAS, Landlord and Tenant entered into that certain Fourth Amendment
to Lease dated as of December ___, 1997 (the "Fourth Amendment"), whereby
certain additional Expansion Space was incorporated within the Demised Premises;
and

        WHEREAS, Landlord and Tenant entered into that certain Fifth Amendment
to Lease dated as of March 16, 2000 (the "Fifth Amendment"), whereby the Suite
309 Expansion Space and the Suite 200 Expansion Space (collectively consisting
of 6,086 rentable square feet and collectively referred to herein as the
"200/309 Space") were incorporated within the Demised Premises thereby bringing
the total number of rentable square feet within the Demised Premises to 127,102
rentable square feet (the Original Lease, First Amendment, Second Amendment,
Third Amendment, Fourth Amendment and Fifth Amendment are sometimes collectively
referred to herein as the "Lease"); and

<PAGE>   2

        WHEREAS, Landlord and Tenant now desire to amend the Lease to (i) expand
the Demised Premises to include approximately 417 rentable square feet located
on the third floor of the Building, as more particularly described on Exhibit A
attached hereto, and commonly known as Suite 311 of the Building (the "Suite 311
Expansion Space"); (ii) extend the term of the Lease for all of the Demised
Premises except for the 200/309 Space and the Suite 311 Expansion Space (the
"200/309/311 Space") from December 22, 2000 to December 31, 2005, (iii) extend
the term of the Lease for the 200/309 Space from December 22, 2005 to December
31, 2005, (iv) to provide Tenant with one (1) five (5) year option to renew, and
(v) otherwise modify the Lease, all upon the terms and conditions set forth in
this Sixth Amendment; and

        WHEREAS, except as otherwise expressly provided herein to the contrary,
all capitalized terms used in this Sixth Amendment shall have the same meanings
given such terms in the Lease.

        NOW, THEREFORE, in consideration of the foregoing recitals and the
mutual covenants contained herein, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties hereto agree as follows:

        1. Addition of Suite 311 Expansion Space. From and after the Suite 311
Expansion Space Commencement Date (as such term is defined below in this Section
1), the Demised Premises shall be expanded to include the Suite 311 Expansion
Space, thereby increasing the size of the Demised Premises to 127,519 rentable
square feet. The term of the Lease for the Suite 311 Expansion Space shall
expire on December 31, 2005 (the "Suite 311 Expansion Space Expiration Date").
As used herein the "Suite 311 Expansion Space Lease Term" shall mean the period
of time commencing on the Suite 311 Commencement Date and ending on the Suite
311 Expiration Date. Effective as of the Suite 311 Expansion Space Commencement
Date, the Suite 311 Expansion Space shall be added to the Demised Premises and
leased on the same terms and conditions set forth in the Lease, as amended by
this Sixth Amendment and the "Demised Premises" shall be re-defined so as to
include the Suite 311 Expansion Space. As used herein the "Suite 311 Expansion
Space Commencement Date" shall mean the earlier of (a) the date upon which
Tenant first commences to conduct business in the Suite 311 Expansion Space or
(b) October 1, 2000.

        1.1 Base Monthly Rent. During the Suite 311 Expansion Space Lease Term,
the Base Monthly Rent payable by Tenant for the Suite 311 Expansion Space shall
be as set forth in the following schedule:

<TABLE>
<CAPTION>
                                                               Monthly Base Rental
                                                                Rate Per Rentable
        Period of Suite 311                                   Square Foot of the
     Expansion Space Lease Term         Base Monthly Rent    Suite 311 Expansion Space
     --------------------------         -----------------    --------------------------
<S>                                     <C>                  <C>
     Suite 311 Expansion Space              $1,021.65                 $2.45
     Commencement Date -12/22/01
          12/23/01-12/22/02                 $1,050.84                 $2.52
         12/23/02 -12/22/03                 $1,084.20                 $2.60
</TABLE>

                                      -2-
<PAGE>   3

<TABLE>
<CAPTION>
                                                               Monthly Base Rental
                                                                Rate Per Rentable
        Period of Suite 311                                   Square Foot of the
     Expansion Space Lease Term         Base Monthly Rent    Suite 311 Expansion Space
     --------------------------         -----------------    --------------------------
<S>                                     <C>                  <C>
        12/23/03 -12/22/04                   $1,117.56                  $2.68

        12/23/04 -12/31/05                   $1,150.92                  $2.76
</TABLE>

               1.2 Tenant's Share; Base Year. Tenant's Share of Expenses and
Property Taxes for the Suite 311 Expansion Space shall be 0.313% and shall be
calculated separate and apart from Tenant's Share of Expenses for the original
Demised Premises (including, without limitation, the 200/309 Space). The Base
Year used to calculate Tenant's Share of Expenses and Property Taxes for the
Suite 311 Expansion Space shall be the calendar year 2001.

        2. Extension of Term.

               2.1 Extension of the Term for the Demised Premises Except for the
200/309/311 Space. The term of the Lease for all of the Demised Premises except
for the 200/309/311 Space, which is currently scheduled to expire on December
22, 2000, is hereby extended for an additional five (5) years and nine (9) days
(the "Extension Period") until December 31, 2005, unless sooner terminated in
accordance with the Lease, upon all of the terms and conditions set forth in the
Lease, except as specifically modified by this Sixth Amendment.

               2.2 Extension of the Term for the 200/309 Space. The term of the
Lease for the 200/309 Space, which is scheduled to expire on December 22, 2005,
is hereby extended for a period of nine (9) days (the "200/309 Space Extension
Period") until December 31, 2005, unless sooner terminated in accordance with
the Lease, upon all of the terms and conditions set forth in the Lease, except
as specifically modified by this Sixth Amendment.

        3. Base Monthly Rent.

               3.1 Base Monthly Rent for Demised Premises Except for the
200/309/311 Space. During the Extension Period, the Base Monthly Rent payable by
Tenant for the Demised Premises except for the 200/309/311 Space shall be as set
forth in the following schedule:

<TABLE>
<CAPTION>
                                                        Monthly Base Rental Rate Per
                                                            Rentable Square Foot
           Period of                                       of the Demised Premises
       Extension Period           Base Monthly Rent    Except for the 200/309/311 Space
       ----------------           -----------------    ---------------------------------
<S>                               <C>                  <C>
      12/23/00-12/22/01            $296,489.20                     $2.45
      12/23/01-12/22/02            $304,960.32                     $2.52
      12/23/02-12/22/03            $314,641.60                     $2.60
      12/23/03-12/22/04            $324,322.88                     $2.68
      12/23/04-12/31/05            $334,004.16                     $2.76
</TABLE>

                                      -3-
<PAGE>   4

               3.2 Base Monthly Rent for 200/309 Space. Notwithstanding the Base
Monthly Rent schedule set forth in Section 2.1 above, during the 200/309 Space
Extension Period Tenant shall pay Base Monthly Rent for the 200/309 Space in
accordance with Section 2 of the Fifth Amendment.

        4. Base Year. During the Extension Period, the Base Year used to
calculate Tenant's Share of Expenses and Property Taxes for the Demised Premises
and the Suite 311 Expansion Space except for the 200/309 Space shall be
calendar year 2001. Notwithstanding the change in the Base Year for the Demised
Premises except for the 200/309 Space, the Base Year used to calculate Tenant's
Share of Expenses and Property Taxes for the 200/309 Space during the lease
terms therefor, as extended by the 200/309 Space Extension Period, shall remain
calendar year 2000.

        5. Construction. Tenant shall be responsible for performing the work and
supplying the materials and labor to prepare the Demised Premises (including the
Suite 311 Expansion Space but excluding the 200/311 Space) for Tenant's use
and occupancy during the Extension Period as set forth in Exhibit B attached
hereto. Landlord shall have no obligation to construct or pay for any
improvements for the Demised Premises except as set forth in Exhibit B and shall
not be liable in any manner for any failure by Tenant to complete construction
in a timely manner. Tenant hereby acknowledges and agrees that Tenant shall
perform such work in and supply such materials and labor to the Demised Premises
(including the Suite 311 Expansion Space but excluding the 200/309 Space) while
Tenant is in possession of such space and that Tenant shall not be entitled to
any abatement of Rent in connection therewith.

       6. Tenant. Tenant shall have the right to construct a trench on the Site
in a location to be mutually agreed upon by Landlord and Tenant and install
certain connecting telecommunications equipment in the trench in order to
connect certain telecommunications equipment located on the property addressed
at 3950 Civic Center Drive, San Rafael, California to certain equipment in the
Demised Premises; provided, however, that such rights granted to Tenant are
subject to (a) the approval of all applicable governmental agencies, (b)
Tenant's compliance with all applicable laws, and (c) Landlord and Tenant
entering into a commercially reasonable license agreement which, among other
things, shall provide: (i) Landlord with the right to approve the size and
location of the trench, the specifications for the equipment to be installed in
the trench, and the contractors who will be performing such work on behalf of
the Tenant, (ii) that Landlord shall be reimbursed for the costs it incurs in
connection with Landlord's review of plans and drawings for Tenant's proposed
work and Landlord's oversight of the construction of such work, (iii) Landlord
with a commercially reasonable indemnity and releases of liability from Tenant;
(iv) that Tenant's right to construct the trench and to use the connecting
telecommunications equipment are subject to the reasonable rules and regulations
governing such construction and use which Landlord may establish from
time-to-time, and (v) upon Landlord's request, Tenant shall remove the
connecting telecommunications equipment from the trench and restore the portion
of the Site on which Tenant constructed the trench to the condition such portion
of the Site existed immediately prior to Tenant's installation of the trench.

                                      -4-
<PAGE>   5

        7. Option To Renew.

               7.1 Option Right. Landlord hereby grants Tenant one (1) option to
extend the Term of the Lease for all, but not less than all, of the Demised
Premises then leased by Tenant (which for purposes hereof, shall include the
200/309/311 Space) for a period of five (5) years (the "Option Term"), which
option shall be exercisable only by written Exercise Notice (as defined below)
delivered by Tenant to Landlord as provided below. Upon the proper exercise of
such option to extend, the term of the Lease for all of the Demised Premises
then leased to Tenant (and not any portion thereof) shall be extended for the
Option Term.

               7.2 Option Rent. The Base Monthly Rent payable by Tenant during
the Option Term (the "Option Rent") shall be equal to the greater of (i) the
"Fair Market Rental Rate" for the Demised Premises; or (ii) the Base Monthly
Rent payable by Tenant during the last year of the Extension Period. As used
herein, the "Fair Market Rental Rate" for purposes of determining the Base
Monthly Rent payable by Tenant during the Option Term shall mean the monthly
base rent at which non-equity tenants, as of the commencement of the Option
Tenant will be leasing non-sublease, non-equity, unencumbered space comparable
in size, location and quality to the Demised Premises for a comparable term,
which comparable space is located in the Building and in other comparable
first-class office buildings in the vicinity of the Building, taking into
account and adjusting the Base Year to be the calendar year in which the Option
Term commences, and taking into consideration all free rent and other
out-of-pocket concessions generally being granted at such time for such
comparable space for the Option Term (including, without limitation, any tenant
improvement allowance provided for such comparable space, with the amount of
such tenant improvement allowance to be provided for the Demised Premises during
the Option Term to be determined after taking into account the age, quality and
layout of the tenant improvements in the Demised Premises as of the commencement
of the Option Term. All other terms and conditions of the Lease shall apply
throughout the Option Term; however, Tenant shall, in no event, have the option
to extend the Lease Term beyond the Option Term described in Section 7.1 above.

               7.3 Exercise of Option. The option contained in this Section 7
shall be exercised by Tenant, if at all, only in the following manner: (i)
Tenant shall deliver written notice to Landlord not more than thirteen (l3)
months nor less than nine (9) months prior to the expiration of the Extension
Period stating that Tenant its option (the "Exercise Notice"). If Tenant
properly and timely provides the Exercise Notice, the Base Monthly Rent during
the Option Term shall be increased to the Option Rent. Landlord shall specify
its determination of the Option Rent not less than ninety calendar (90) days
prior to the commencement of the Option Term. If Tenant believes that the Option
Rent specified by Landlord exceeds the actual fair market rent for the Demised
Premises as of the commencement of the Option Term, then Tenant shall so notify
Landlord within twenty (20) business days following receipt of Landlord's notice
("Objection Notice"). If Tenant fails to provide an Objection Notice to Landlord
within said twenty (20) business days of receipt of Landlord's notice,
Landlord's determination of the Option Rent shall be final and binding upon the
parties.

               7.4 Arbitration of Option Rent. If the parties are unable to
agree upon the Option Rent within ten (10) business days after Landlord's
receipt of Tenant's Objection Notice, the Option Rent shall be determined as
follows:

                                      -5-
<PAGE>   6

                      (i) Within fifteen (l5) days after receipt of the
        Objection Notice, Tenant shall obtain and deliver in writing to Landlord
        a determination of the fair market rent for the Premises for a term
        equal to the Option Term from a broker ("Tenant's Broker") licensed in
        the State of California and engaged in the office brokerage business in
        Marin County for at least the immediately preceding five (5) years
        ("Broker Qualifications"). If Landlord accepts such determination, the
        Base Monthly Rent for the Option Term shall be increased to an amount
        equal to the amount determined by Tenant's Broker.

                      (ii) If Landlord does not accept such determination,
        within fifteen (15) days after receipt of the determination of Tenant's
        Broker, Landlord shall designate a broker ("Landlord's Broker") with the
        Broker Qualifications who shall deliver in writing to Tenant its
        determination of the fair market rent for the Premises for a term equal
        to the Option Term.

                      (iii) Landlord's Broker and Tenant's Broker shall name a
        third broker with the Broker Qualifications who shall be competent and
        impartial ("Third Broker"). The Third Broker, however selected, shall be
        a person who has not previously acted in any capacity for either
        Landlord or Tenant. The Third Broker shall choose one of the two
        estimates of fair market rent submitted by Landlord's Broker and
        Tenant's Broker, which must be the one that is closer to the fair market
        rent as determined by the Third Broker. The Third Broker's determination
        of fair market rent shall be binding upon Landlord and Tenant. If the
        Third Broker believes that expert advice would materially assist
        him/her, he/she may retain one or more qualified persons, including but
        not limited to legal counsel, brokers, architects or engineers, to
        provide such expert advice ("Experts").

                      (iv) Landlord shall pay the costs and fees of Landlord's
        Broker in connection with any determination hereunder, and Tenant shall
        pay the costs and fees of Tenant's Broker in connection with such
        determination. The costs and fees of the Third Broker and any Experts
        shall be paid one-half by Landlord and one-half by Tenant.

               7.5 Payment Until Option Rent is Determined. If the amount of the
fair market rent is not known as of the commencement of the respective option
term, then Tenant shall continue to pay the Base Monthly Rent in effect at the
expiration of the Tern until the Option Rent is determined. When such
determination is made, Tenant shall pay any deficiency to Landlord within
fifteen (15) days after receipt of demand.

               7.6 Minimum Base Monthly Rent, Notwithstanding any provision of
this Section, in no event shall the Base Monthly Rent payable during the Option
Term be less than the sum of (i) the Base Monthly Rent in effect immediately
prior to the expiration of the initial Term and (ii) the rent adjustments
payable by Tenant on a per square foot basis during the last Lease Year of the
initial Term.

               7.7 Suspension of Right to Extend Term of the Lease.
Notwithstanding anything in the foregoing to the contrary, at Landlord's option,
and in addition to all of

                                      -6-
<PAGE>   7

Landlord's remedies under the Lease, at law or in equity, the right to extend
the term of the Lease hereinabove granted to Tenant shall not be deemed to be
properly exercised if, as of the date Tenant delivers the Exercise Notice or as
of the date of the extension, Tenant is in default under this Lease, after
giving effect to notice and cure periods, if any. In addition, Tenant's right to
extend the term of the Lease is personal to the original Tenant executing this
Sixth Amendment, and may not be assigned or exercised, voluntarily or
involuntarily, by or to, any person or entity other than the original Tenant,
and shall only be available to and exercisable by the Tenant when the original
Tenant (or an entity affiliated with Tenant or which controls Tenant, is
controlled by Tenant or which is under common control with Tenant or which is
the result of a merger or consolidation with Tenant) is in actual and physical
possession of the entire Demised Premises, (including, without limitation, the
200/309/3 11 Space).

        8. Deletions. Sections 1.3, 1.6(c) and 1.8 of the Original Lease and
Section 7 of the First Amendment are hereby deleted in their entirety and are of
no further force or effect.

        9. Convenient Rent Schedule. Although (i) the Base Monthly Rent payable
by Tenant for the Demised Premises except for the 200/309/3 11 Space during the
Extension Period is set forth in Section 3.1 above, (ii) the Base Monthly Rent
payable by Tenant for the Suite 311 Expansion Space during the Suite 311
Expansion Space Lease Term is set forth in Section 1.1 above and (iii) the Base
Monthly Rent payable by Tenant for the 200/309 Space during the term of the
lease for the 200/309 Space and the 200/309 Space Extension Period is set forth
in Section 3.2 above, for the convenience of the parties, set forth below is the
schedule of the Base Monthly Rent payable by Tenant for the entirety of the
Demised Premises (including the 200/309/3 11 Space) during the Extension Period

<TABLE>
<CAPTION>
           Period                     Monthly Installment of Base Rent
           ------                     --------------------------------
<S>                                   <C>
     12/23/00 to 12/22/01                         $310,595.75
     12/23/01 to 12/22/02                         $319,096.06
     12/23/02 to 12/22/03                         $328,810.70
     12/23/03 to 12/22/04                         $338,525.34
     12/23/04 to 12/31/05                         $348,239.98
</TABLE>

        10. Brokers. Landlord and Tenant hereby represent and warrant that it
has not dealt with any broker in connection with this Sixth Amendment except for
Legacy Partners Commercial, Inc. and Colliers International (collectively, the
"Brokers"), and insofar as such party knows, no other broker negotiated or
participated in negotiations of this Sixth Amendment or is entitled to any
commission in connection herewith. Landlord agrees to pay the commission of the
Brokers pursuant to a separate agreement. Each party agrees to indemnify,
protect and defend the other party against and hold the other party harmless
from any and all claims, demands, losses, liabilities, lawsuits, judgments, and
costs and expenses (including without limitation reasonable attorneys' fees)
with respect to any leasing commissions or equivalent compensation alleged to be
owing on account of the indemnifying party's dealings with any real estate
broker or agent, other than the Brokers.

                                      -7-
<PAGE>   8

        11. No Further Modification. Except as set forth in this Sixth
Amendment, all of the terms and provisions of the Lease shall remain unmodified
and in full force and effect.

        IN WITNESS WHEREOF, Landlord and Tenant have executed this Sixth
Amendment as of the day and year first above written.

LANDLORD:                     WHLW REAL ESTATE LIMITED
                              PARTNERSHIP, a Delaware limited partnership

                              By: LEGACY PARTNERS COMMERCIAL, INC.,
                                  a Texas corporation, as agent and manager for
                                  Landlord

                                  By: /s/ BARRY DiRAIMONZO
                                     -------------------------------------------
                                     Name: Barry DiRaimonzo
                                          --------------------------------------
                                     Title:
                                           -------------------------------------

TENANT:                       AUTODESK, INC.,
                              a California corporation

                                  By: /s/ STEVE CAKEBREAD
                                     -------------------------------------------
                                     Name: Steve Cakebread
                                          --------------------------------------
                                     Title:
                                           -------------------------------------

                                  By: /s/ CAROL BARTZ
                                     -------------------------------------------
                                     Name: Carol Bartz
                                          --------------------------------------
                                     Title:
                                           -------------------------------------

                                      -8-

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