Document:

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EXHIBIT 10.1

                         AGREEMENT OF PURCHASE AND SALE

This agreement (the "Agreement") dated as of the 17th day of March, 2005 between
OTTAWA COMMUNITY HOUSING CORPORATION (the "Purchaser") and GSI LUMONICS INC.
(the "Vendor") provides for the purchase of the land and premises (the
"Property") comprising approximately 3.18 acres and municipally known as 39
Auriga Drive, Ottawa, Ontario. The Property is more particularly described as
Parts 1 and 2 on the draft reference plan attached as Schedule "A" to this
Agreement. For good and valuable consideration, the receipt and adequacy of
which are acknowledged, the Purchaser and Vendor agree as follows:

1.    PURCHASE, PURCHASE PRICE AND CLOSING DATE: The Purchaser agrees to
purchase and the Vendor agrees to sell the Property on the terms and conditions
set out in this Agreement and for the purchase price (the "Purchase Price") of
TWO MILLION AND SEVENTY-FIVE THOUSAND DOLLARS (CDN $2,075,000.00) payable as to
SEVENTY-FIVE THOUSAND DOLLARS ($75,000.00) by cheque to be delivered by the
Purchaser within 24 hours of the execution and acceptance of this Agreement to
the Vendor's agent, namely Colliers Macaulay Nicolls (Ontario) Inc. "In Trust"
to be held as a deposit (the "Deposit"), and the balance, subject to adjustment,
payable to the Vendor, or as it may direct, by cash or certified cheque on the
completion of this Agreement. This transaction will be completed on the earlier
of the 27th day of May, 2005 or fifteen (15) days after satisfaction of the
condition set out in paragraph 2(b)(i) (the "Closing Date").

2.    CONDITIONS:

a.    PURCHASER'S CONDITIONS: The Purchaser's obligation to carry out the
transaction contemplated by this Agreement is subject to the satisfaction or
waiver by the Purchaser of each of the following conditions by the dates
specified, which conditions are for the sole benefit of the Purchaser and which
may be waived by the Purchaser in its sole discretion:

      i.    DUE DILIGENCE: This Agreement is conditional upon the inspection and
            approval of the physical property by the Purchaser, its agents,
            consultants or any other persons as the Purchaser deems necessary.
            The physical inspection

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            shall include but not be limited to roof, mechanical, environmental,
            and structural space inspections, the examination of any legal
            restrictions, rights of way or easements which the Vendor is not
            obliged to discharge on or before the Closing Date, and the
            obtaining of reports satisfactory to the Purchaser at its own
            expense. The Vendor agrees to co-operate with the Purchaser in
            providing reasonable access to the Property for the purpose of this
            inspection and Purchaser agrees that Vendor will have the right to
            have one or more representatives of Vendor accompany Purchaser's
            representatives, agents or designees while they are on the Property.
            Unless the Purchaser gives notice in writing delivered to the Vendor
            not later than 5:00 pm Ottawa Time on the 30th day of April, 2005
            (the "Condition Date") that this condition is fulfilled, this
            Agreement shall be null and void and the deposit shall be returned
            to the Purchaser in full (without interest). This condition is
            included for the sole benefit of the Purchaser and may be waived at
            their option in writing to the Vendor within the time period stated
            herein.

   Any damage resulting from the Purchaser's tests or investigations will be
   promptly repaired at its sole expense.

      ii.   CLOSING DATE: As of the Closing Date, the representations and
            warranties of the Vendor set out in this Agreement will be true and
            accurate and of the same effect as if made on and as of the Closing
            Date and all the terms, covenants and conditions of this Agreement
            to be complied with or performed by the Vendor on or prior to the
            Closing Date will have been complied with or performed.

b.    Vendor's Conditions: The Vendor's obligation to carry out the transaction
contemplated by this Agreement is subject to the satisfaction or waiver by the
Vendor of each of the following conditions by the dates specified, which
conditions are for the sole benefit of the Vendor and which may be waived by the
Vendor in its sole discretion:

      i. SEVERANCE: The completion of this transaction is conditional for a
            period of four (4) months from the date of execution of this
            Agreement (the "Conditional Period"),

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            upon the Vendor obtaining the consent of the Committee of
            Adjustment/Land Division Committee for the City of Ottawa to the
            severance of the subject Property, with all conditions imposed in
            connection therewith having been fully satisfied or completed prior
            to the expiry of the Conditional Period, and there being no appeal
            therefrom. The Vendor shall be responsible for all costs in respect
            of filing the severance application with the Committee of
            Adjustments. The Vendor agrees to proceed diligently to procure such
            consent, and to satisfy all conditions imposed in connection
            therewith, all at the Vendor's sole cost and expense. This condition
            is included for the sole benefit of the Vendor and may be waived at
            its option in writing to the Purchaser within the time period stated
            herein. Unless the Vendor gives written notice to the Purchaser
            prior to the expiration of the Conditional Period that the foregoing
            condition has been satisfied, this Agreement shall be null and void,
            and the deposit shall be returned to the Purchaser, without interest
            or deduction.

      ii. CLOSING DATE: As of the Closing Date, the representations and
            warranties of the Purchaser set out in this Agreement will be true
            and accurate and of the same effect as if made on and as of the
            Closing Date and all the terms, covenants and conditions of this
            Agreement to be complied with or performed by the Purchaser on or
            prior to the Closing Date will have been complied with or performed.

      iii.VENDOR'S BOARD APPROVAL: This Agreement is conditional upon the Vendor
            obtaining final approval from its Board of Directors. Unless the
            Vendor gives notice in writing delivered to the Purchaser not later
            than 5:00 pm Ottawa Time on the 31st day of March, 2005 that this
            condition is fulfilled, this Agreement shall be null and void and
            the deposit shall be returned to the Purchaser without interest or
            deduction. This condition is included for the sole benefit of the
            Vendor and may be waived at their option in writing to the Purchaser
            within the period stated herein.

3.    VENDOR'S REPRESENTATIONS: The Vendor covenants, represents and warrants to
and in favour of the Purchaser that:

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      a. ENVIRONMENTAL: To the best of the Vendor's knowledge and belief and
      without investigation and subject to the provisions contained in section
      5.e below, the Property has never been used at any time as a landfill or
      waste disposal site and that the use and occupation of the Property and
      condition of the Property do not contravene any law, by-law, order,
      ordinance, ruling, regulation, guideline, policy, certificate, approval,
      consent or directive of any applicable federal, provincial or municipal
      government, department, agency or authority or any court relating to any
      environmental matters relating to the Property and the Property does not
      contain any contaminant, pollutant, dangerous, noxious or toxic substance,
      hazardous waste, flammable, explosive or radioactive material, urea
      formaldehyde foam insulation, asbestos, polychlorinated biphenyls or any
      other substance or material ("Hazardous Substance") that may be
      detrimental to the environment, including the air, soil, subsoil or
      surface or ground water at the Property. The Vendor has not emitted,
      released, discharged or disposed or deposited any Hazardous Substance at
      or near the Property and there are no claims, actions, prosecutions,
      charges or any other proceedings, and the Vendor has received no notice of
      any such proceedings, which relate to the environmental status of the
      Property.

      b. SECTION 116: The Vendor is not now, and will on the Closing Date not
      be, a non-resident of Canada within the meaning of Section 116 of the
      Income Tax Act (Canada).

      c. LIABILITIES: There are no contracts, agreements or employees associated
      with the Property in respect of which the Purchaser will incur any
      liability as a result of becoming the owner of the Property.

      d. CHARGES AND LEVIES: There are no local improvement charges, development
      charges or special levies outstanding against the Property and there will
      be no such charges or levies outstanding against the Property as of the
      Closing Date.

      e. WORK ORDERS: If any work order, deficiency notice, notice of violation
      or other communication from any governmental authority or other regulating
      entity is received by the Vendor or the Purchaser on or prior to the
      Closing Date, the Vendor will, at its

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      expense, perform any required work or other actions required pursuant to
      such communication on or prior to the Closing Date.

      f. NO LITIGATION: There are no actions, suits or proceedings pending or,
      to the knowledge of the Vendor, threatened against or affecting the
      Vendor, the Property or the occupancy or use of the Property by the
      Vendor, in law or in equity, which could affect the validity of this
      Agreement or any transaction provided for in this Agreement, the title to
      the Property or any part of the Property, the conveyance of the Property
      to the Purchaser, the right of the Purchaser from and after the Closing
      Date to own, occupy and obtain the revenue from the Property or any action
      taken or to be taken in connection with this Agreement.

      g. NO INDEBTEDNESS CONSTITUTING A LIEN: The Vendor will not on the Closing
      Date have any indebtedness to any person that might by operation of law or
      otherwise constitute a lien, charge or encumbrance on the Property or any
      part of the Property or which could affect the right of the Purchaser,
      from and after the Closing Date, to own occupy and obtain the revenue from
      the Property.

      h. LICENSES, APPROVALS & PERMITS: All necessary licenses, approvals and
      permits for the construction, occupancy and operation of the Property and
      for its existing use have been obtained.

      I. VACANT POSSESSION: The Property is not subject to any lease or
      agreement to lease and the Purchaser shall have vacant possession of the
      Property on the Closing Date.

4.    PURCHASER'S REPRESENTATIONS: The Purchaser covenants, represents and
warrant to and in favour of the Vendor that:

      a. AUTHORITY TO EXECUTE ORGANIZATION: Purchaser is validly organized and
      in good standing under the laws of the province of its organization, and
      the execution of this Agreement, delivery of money and all required
      documents, Purchaser's performance of this Agreement and the transaction
      contemplated hereby have been duly authorized by the

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      requisite action on the part of the Purchaser and Purchaser's directors,
      partners, members, managers or trustees.

      b. PURCHASER ACKNOWLEDGEMENT: As of the expiration of the Condition Date
      Purchaser acknowledges that it has been given a reasonable opportunity to
      inspect and investigate the Property, all improvements thereon and all
      aspects relating thereto, either independably or through agents and
      experts of Purchaser's choosing and that Purchaser is acquiring the
      Property based upon Purchaser's own investigation and inspection thereof,
      but subject to its reliance on the representations and warranties of the
      Vendor contained in this Agreement.

5.    VENDOR'S DELIVERIES/COVENANTS: The Vendor will provide to the Purchaser
the following:

      a. SURVEY AND OTHER DOCUMENTATION: The Vendor covenants to make available
      to the Purchaser within three (3) Business Days after acceptance hereof,
      any plan of survey and structural, mechanical, electrical and
      architectural drawings that are in the possession of the Vendor. For
      clarity, the Vendor shall have no responsibility to provide any new or up
      to date survey except as may be in the Vendor's possession as of the date
      of this Agreement. Any surveys, tests, investigations, or studies
      performed by or at the direction of Purchaser shall be at Purchaser's sole
      cost and expense.

      b. MISCELLANEOUS DOCUMENTATION: Between the date of this Agreement and the
      Condition Date, the Vendor shall, upon reasonable written request in
      advance by the Purchaser, provide the Purchaser with reasonable access to
      pertinent files, documents, inspection reports and historical building
      operating statements that are in the possession of the Vendor. In
      addition, the Vendor shall cooperate in providing reasonable access to
      Purchaser and its contractors for the purpose of completing roof,
      mechanical, environmental, and structural space inspections. All costs of
      such inspections shall be the responsibility of Purchaser and shall be at
      Purchaser's sole cost and expense. Purchaser shall restore any damage
      caused to the Property by Purchaser entry on the Property for

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      inspection purposes at Purchaser's sole cost and expense if the
      transaction contemplated under this Agreement is not completed.

      c. MATERIAL CHANGE(S): The Vendor covenants that until the successful
      completion of this transaction, the Vendor will give the Purchaser prompt
      written notice of any material change of which the Vendor becomes aware in
      respect of any of the documentation delivered pursuant to this Agreement,
      or any change of which the Vendor becomes aware in respect of the
      Property.

      d. COMMISSIONS: The Vendor shall pay any real estate commissions payable
      in connection with the sale of the Property to any agent or broker
      retained by the Vendor in connection therewith.

      e. UNDERGROUND STORAGE TANK: A 2000-litre underground storage tank ("UST")
      is presently located outside the south-east corner of the building located
      on the Property and is connected to a room within the building designated
      as the "Chemical Storage" room. The Vendor covenants and agrees with the
      Purchaser that on or before the Closing Date the Vendor shall, at its
      expense:

      i.    engage the services of a qualified, licensed contractor to excavate
            and remove from the Property the UST and all associated piping which
            connects the UST to the "Chemical Storage" room and reinstate the
            Property; and

      ii.   provide to the Purchaser a report addressed to the Purchaser (and
            its lenders) from an environmental consultant acceptable to the
            Purchaser, acting reasonably, to the effect that the UST and
            associated piping have been removed from the Property and that the
            soil in the immediate vicinity of the UST is free of any Hazardous
            Substances.

6.    PURCHASER EXCLUSIVITY: The Purchaser covenants to maintain full
exclusivity and not enter into negotiations or submit Agreements to obtain
economic interest in any other property until this Agreement has been formally
completed or terminated.

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7.    TITLE: Provided that title to the Property will be marketable and free and
clear of all liens, charges, encumbrances, easements, encroachments,
rights-of-way, dower or spousal claims, restrictive covenants, reservations and
defects of every nature or kind other than any building or other restrictions
registered on title to the Property, and any easements or rights-of-way for the
installation of and/or maintenance of services, utilities, provided same have
been complied with to the Closing Date. The Purchaser will be allowed until the
30th day of April 2005 to examine the title to the Property at its own expense.
If within that time the Purchaser provides any valid objection to title or
description in writing to the Vendor which the Vendor is unable or unwilling to
remove or satisfy and which the Purchaser will not waive, this Agreement will,
at the option of the Purchaser, and notwithstanding any intermediate acts or
negotiations in respect of such objection, terminate and the Deposit and other
monies paid under this Agreement by the Purchaser, together with accrued
interest, will be returned to the Purchaser immediately. The Vendor covenants to
discharge all liens, charges, and other encumbrances on or prior to the Closing
Date and will deliver up vacant possession of the Property on the Closing Date.

8.    ADJUSTMENTS:

      a. UTILITIES: The amount due on any gas, electrical, water, sewer, or
      other utility bill relating to the Property shall be paid by the Vendor as
      of the Closing Date (the day itself to be apportioned to the Purchaser).
      Any utility deposits made by Vendor shall be and remain the property of
      the Vendor. The Vendor shall terminate all such utilities in its name as
      of the Closing Date and shall have no further obligation to pay any such
      utilities. Purchaser shall be responsible for notifying all utilities and
      commencing and paying for their own service as of the Closing Date.

      b. REALTY TAXES: All real estate taxes in respect to any calendar year
      prior to the year in which the Closing Date occurs, including penalties,
      interest and deferred payments, shall be paid by Vendor on or before the
      Closing Date. Purchaser shall have the same obligation for the period of
      time subsequent to the calendar year in which the Closing Date occurs. All
      real estate taxes attributable to the Property due and payable in the
      calendar year in which the Closing Date occurs shall be prorated as of the
      Closing Date

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      (the day itself to be apportioned to the Purchaser). If the Closing Date
      shall occur before the actual real estate taxes for the year of the
      Closing Date (i.e. taxes due and payable in 2005) are known, the
      apportionment of real estate taxes shall be upon the basis of the real
      estate taxes for the immediately preceding year, provided that if the
      taxes for the current year are thereafter determined to be more or less
      than the real estate taxes for the preceding year (after any appeal in
      assessed valuation thereof is concluded) Vendor and Purchaser promptly
      shall adjust the proration of such real estate taxes and Vendor or
      Purchaser, as the case may be, shall pay to the other any amount required
      as a result of such an adjustment; If there is any refund, this shall be
      prorated between Vendor and Purchaser based on the Closing Date. For
      purposes of calculating prorations, all prorations shall be made on the
      basis of the actual number of days of the year and monthly which have
      elapsed as of the Closing Date.

      c. INSURANCE: Any insurance maintained by the Vendor will not be
      transferred as of the Closing Date but the Property will remain the
      responsibility of the Vendor until the Closing Date. All risk of loss or
      damage with respect to the Property shall pass from the Vendor to
      Purchaser on the Closing Date.

9.    GST: No goods and services tax will be paid by the Purchaser to the Vendor
with respect to the purchase by the Purchaser of the Property if the Purchaser
provides to the Vendor on or prior to the Closing Date a certificate of the
Purchaser indicating the Purchaser's registration number for the purpose of the
Goods and Services Tax imposed under the Excise Tax Act (Canada).

10.   CLOSING ARRANGEMENTS AND VENDOR'S DELIVERIES: This Agreement shall be
completed on the Closing Date between the hours of 9:30 a.m. and 4:30 p.m. Where
each of the Vendor and Purchaser retain a lawyer to complete the Agreement of
Purchase and Sale of the Property, and where the transaction will be completed
by electronic registration pursuant to Part lll of the Land Registration Reform
Act, R.S.O., 1990, Chapter 14 and any amendments thereto, the Vendor and
Purchaser acknowledge and agree that the delivery of documents and the release
thereof to the Vendor and Purchaser may, at the lawyer's discretion (a) not
occur contemporaneously with the registration of the transfer/deed of land or
other registrable documentation and (b) be subject to

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conditions whereby the lawyer receiving documents and/or money will be required
to hold them in trust and not release them except in accordance with the terms
of a written agreement between the lawyers. On the Closing Date the Vendor will
deliver to the Purchaser the following documents:

      a. DEED: A registrable transfer/deed to the Property in fee simple;

      b. CERTIFICATE: A Certificate of the Vendor certifying that it is not a
      non-resident within the meaning of S. 116 of the Income Tax Act (Canada)
      and that the representations and warranties of the Vendor contained in
      this Agreement are true and accurate as of the Closing Date;

      c. UNDERTAKING: An undertaking to adjust and readjust any items properly
      adjustable pursuant to this Agreement.

      d. KEYS: All keys and entry devices with respect to the Property and the
      combination of any locks and vaults.

      e. TELEPHONES: A bill of sale of the telephone system and hand sets which
      are located on the Property, excluding the telephone system and hand sets
      currently being used by Vendor's employees, and which the Vendor warrants
      are owned by it free from encumbrance.

      f. OTHER. Such other bills of sale, transfers, assignments, declarations,
      discharges if any, and documents relating to the completion of this
      Agreement as may be reasonable necessary and appropriate to complete the
      transaction contemplated in the Agreement.

11.   CLOSING DELIVERIES OF THE PURCHASER. The Purchaser will on the Closing
Date deliver to the Vendor the balance of the Purchase Price by a certified
cheque or bank draft payable to the Vendor, or as the Vendor may in writing
direct; an undertaking to readjust; the GST certificate

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referred to in Section 9 and such other documentation as may be reasonably
necessary and appropriate to complete the transaction contemplated in this
Agreement.

12.   RISK. All buildings and improvements on the Property will be and remain
until the Closing Date at the risk of the Vendor. Until completion of this
Agreement, the Vendor will maintain insurance on the Property in such amounts as
a careful and prudent owner of similar property and premises would maintain.
Pending completion, the Vendor will hold all insurance policies, if any, and the
proceeds from any such policies in trust for the parties as their interests may
appear and in the event of damage, the Purchaser may either terminate this
Agreement and have the Deposit and other monies paid under this Agreement by the
Purchaser returned together with any accrued interest or, at its option, take
the proceeds of any insurance and complete the purchase.

13.   LIABILITY OF PURCHASER. If the Purchaser shall default in the performance
of any obligation under this Agreement and such default entitles the Vendor to
terminate this Agreement, such right of termination will be the Vendor's only
remedy and the Vendor will be entitled to retain the Deposit as liquidated
damages and not as a penalty.

14.   CONFIDENTIALITY. Vendor and Purchaser hereby covenant and agree that, at
all times after the date of execution hereof and prior to the Closing Date,
unless consented to in writing by the other party, no press release or other
public disclosure concerning this transaction shall be made and each party
agrees to use best efforts to prevent disclosure of this transaction, other than
(i) to directors and officers of the parties, and employees, prospective
mortgage lenders of Purchaser, solicitors, accounts, agents and affiliates of
the parties who are involved in the ordinary course of business with this
transaction, all of which shall be instructed to comply with confidentially
provisions hereof or (ii) as required by law. Upon termination of this Agreement
for any reason by either party, Purchaser shall have the obligation to return to
Vendor all documents and copies thereof and any other information received by
Purchaser from Vendor or Vendor's agents with respect to the Property
("Information") and shall not disclose to any third party the contents thereof.

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                                       12

15.   GENERAL. Any tender of documents or money may be made upon the Vendor or
the Purchaser or upon their respective solicitors and money may be tendered by
certified cheque or bank draft drawn on a Canadian Chartered Bank. This
Agreement will be binding upon and enure to the benefit of the Vendor and the
Purchaser and their respective successors and assigns. This Agreement may be
executed in any number of counterparts, each of which will be deemed to be an
original and all of which taken together will be deemed to constitute one and
the same Agreement. Counterparts may be executed either in an original or fax
form and the parties agree to adopt any signature received by facsimile as
original signatures, provided however that any party providing its signature in
such manner promptly forward to the other party an original of the signed copy
of the Agreement which was so faxed. This Agreement will be governed and
construed in accordance with the laws of the Province of Ontario and the laws of
Canada applicable to this Agreement and will be treated in all respects as an
Ontario contract. The use of the headings in this Agreement is for convenience
of reference only and will not affect the meaning or construction of this
Agreement. This Agreement constitutes the entire Agreement between the parties
pertaining to the subject matter of this Agreement and supersedes all prior
agreements, warranties or representations, discussions and negotiations with
respect to the Agreement, whether oral or written. If the time limited for the
performance or completion of any matter in this Agreement does not fall on a day
that the public offices for registering documents to be delivered pursuant to
this Agreement are open for business (a "Business Day"), the time so limited
will extend to the next following Business Day. The parties will promptly do,
execute, deliver or cause to be done, executed and delivered all further acts,
documents and things to carry out the true intent of this Agreement.

16.   RIGHT OF FIRST REFUSAL. If the Vendor shall obtain from a bona fide arm's
length person (the "Offeror") a bona fide arm's length offer (the "Offer") to
purchase from the Vendor (the "Selling Party") all or part of those lands more
particularly described as Parts 3 and 4 on the draft reference plan attached as
Schedule "A", (the "Surplus Property") at a price and on terms that the Selling
Party is prepared to accept, the Selling Party shall offer to sell the Surplus
Property to the Purchaser in accordance with the following provisions:

      a.    The Selling Party shall give to the Purchaser notice in writing (the
            "Notice of Offer") accompanied by a copy of the Offer. The Notice of
            Offer shall set out:

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                                       13

            i)    the portion of the Surplus Property to which the Offer
                  relates;

            ii)   a statement that the Selling Party will accept the Offer of
                  the Offeror and complete the sale of the Surplus Property (or
                  if the Offer has been accepted subject to compliance with this
                  clause, that the Selling Party will complete the sale of the
                  Surplus Property) if the Surplus Property is not purchased by
                  the Purchaser pursuant to the following provisions of this
                  paragraph.

      b.    The Notice of Offer shall be deemed to be an offer by the Selling
            Party to sell to the Purchaser the Surplus Property on the terms
            contained in the Offer, except that the closing date shall be sixty
            (60) days after the end of the fifteen (15) day period referred to
            in c. below (unless an earlier or later closing date is agreed
            upon).

      c.    The Purchaser shall be entitled, within fifteen (15) days following
            the giving of the Notice of the Offer, to give to the Selling Party
            written notice (the "Purchaser Notice") accepting the offer of the
            Selling party represented by the Notice of Offer and the transaction
            shall be completed accordingly.

      d.    If the Offer relates to part of the Surplus Property, the remaining
            parts shall continue to be subject to the provisions of this
            paragraph.

17.   NOTICE. Any notice, certificate, consent, waiver, amendment or other
written communication required or permitted to be given under the Agreement will
be in writing made by the parties or their respective solicitors and will be
effectively given and made if delivered personally or by facsimile
communication, in the case of the Vendor, addressed to it at:

      GSI Lumonics Inc.
      39 Manning Road
      Billerica, MA 01821
      U.S.A.
      Attention: Corporate Counsel
      Facsimile No.: (978) 663-9466

With a copy to:

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                                       14

      Colliers International
      55 Metcalfe Street, Suite 240,
      Ottawa, Ontario
      K1P 6L5
      Attention: Mr. Peter D. Saarty
      Facsimile No. (613) 567-8035

And in the case of the Purchaser, addressed to it at:

      2197 Riverside Drive, Suite 600,
      Ottawa, Ontario
      K1H 1A9
      Attention:  Mr. Ronald P. Larkin, General Manager
      Facsimile No.: (613) 731-4463

Any communication given or made will be deemed to have been given or made on the
day it was received unless (i) it was received after 5 p.m. or (ii) if such day
is not a Business Day, in each which cases it will be deemed to have been given
and made and to have been received on the next following Business Day.

IN WITNESS WHEREOF the parties have executed this Agreement.

OTTAWA COMMUNITY HOUSING CORPORATION      GSI LUMONICS INC.

By: ____________________________          By: ____________________________

Name: Ronald P. Larkin                    Name: Thomas R. Swain

Title: I/General Manager                  Title: Vice President, Finance and CFO

I have authority to bind the              I have authority to bind the
  Corporation.                              Corporation.<PAGE>
                                                                     Exhibit 4.1

                         CERTIFICATE OF MEMBERSHIP UNITS

                                                                      Membership
Number                  (SIOUXLAND ETHANOL, LLC LOGO)                    Units
------                                                                ----------

    ------------------------------------------------------------------------
                             SIOUXLAND ETHANOL, LLC
      A LIMITED LIABILITY COMPANY ORGANIZED UNDER THE LAWS OF THE STATE OF
                                    NEBRASKA
    ------------------------------------------------------------------------

     THIS CERTIFIES THAT ____________________________________________ is/are the
owner(s) ___________________________ of UNITS (________) of the Membership Units
of Siouxland Ethanol, LLC, a Nebraska limited liability company. Changes in the
actual Membership Units held by the Members are reflected in the Certificate of
Registration of the Company.

The Membership Units represented by this Certificate may not be transferred or
assigned except in compliance with the Operating Agreement of the Company, a
copy of which is available at the principal office of the Company.

IN WITNESS WHEREOF, the Company has caused this Certificate to be signed by its
duly authorized President and Secretary as of this __________ day of
_______________, 20__.

-------------------------------------   ----------------------------------------
Tom Lynch, President                    Doug Garwood, Secretary

<PAGE>

FOR VALUE RECEIVED, __________ hereby sell, assign, and transfer unto __________
____________________________________________________ _____________________ Units
represented by the within Certificate, and do hereby irrevocably constitute and
appoint _______________________________ Attorney to transfer the said Units on
the books of the within named Company with full power of substitution in the
premises.

     Dated _____________________________, ________________.

In Presence of

_____________________________________

                                        ________________________________________

                                        ________________________________________

     The transferability of the Units represented by this certificate is
     restricted. Such Units may not be sold, assigned, or transferred, nor will
     any assignee, vendee, transferee, or endorsee thereof be recognized as
     having acquired any such Units for any purposes, unless and to the extent
     such sale, transfer, hypothecation, or assignment is permitted by, and is
     completed in strict accordance with, applicable state and federal law and
     the terms and conditions set forth in the Amended and Restated Operating
     Agreement and agreed to by each Member.

     The securities represented by this certificate may not be sold, offered for
     sale, or transferred in the absence of an effective registration under the
     securities act of 1933, as amended, and under applicable state securities
     laws, or an opinion of counsel satisfactory to the company that such
     transaction is exempt from registration under the Securities Act of 1933,
     as amended, and under applicable state securities laws.

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