PHASE I OPTION AGREEMENT
                               (2101 Kennedy Option)


     THIS AGREEMENT, made and entered into this 10th day of February, 1999, by 
and between Hillcrest Development, a Minnesota limited partnership, hereinafter 
called "Owner," and R&D Systems, Inc., a Minnesota corporation, or its only 
permitted assignee, Techne Corporation, hereinafter called "Buyer";

     WITNESSETH:

     WHEREAS, Owner is the fee simple owner of certain real properties improved
with buildings commonly known as 2101 Kennedy and 659 Cleveland and is the fee 
simple owner of real property used for surface parking lots commonly known as 
the "Triangular Portion" and the northerly portion of the MT-BN lot (consisting 
of land which can contain up to 474 parking stalls), all of which are located in
the City of Minneapolis, County of Hennepin, State of Minnesota, and legally 
described in Exhibit A hereto attached ("Parcels"); and

     WHEREAS, Buyer and Owner have prior to the execution of this Option
Agreement entered into a Purchase Agreement for the purchase and sale of real 
property which includes properties commonly known as 614 McKinley, 640 McKinley 
and 2201 Kennedy ("Purchase Agreement") and have simultaneously with the 
execution of this Option Agreement entered into an additional option agreement 
with respect to 2001 Kennedy and certain real property to be used for parking 
purposes ("Phase II Option"); and

     WHEREAS, Buyer desires to obtain an option to purchase the Parcels, all
personal property items owned by Owner and exclusively used by Owner in the 
maintenance and operation of the Parcels and chosen to be purchased by Buyer 
("Personal Property"), all guarantees and warranties in effect regarding 
improvements to the Parcels ("Warranties") and all contracts and permits 
affecting the Parcels selected by Buyer ("Contracts") (hereafter the Parcels, 
Personal Property, Warranties, and Contracts are collectively referred to as the
"Property"); and

     WHEREAS, Owner is willing to grant such an option on the terms and
provisions hereinafter contained.

     NOW, THEREFORE, in consideration of One Dollar ($1.00) and other good and
valuable consideration herewith paid by Buyer to Owner, the receipt and 
sufficiency of which is hereby acknowledged by Owner, and in further 
consideration of the mutual covenants and agreements herein contained, it is 
agreed by and between the parties hereto as follows:

     1.  Option.  Owner hereby grants to Buyer, for the period beginning on the
date hereof and ending at 11:59 o'clock p.m., on November 15, 2001 (the "Option 
Termination Date"), the exclusive right and option to purchase the Property upon
the terms and conditions herein contained.  

     2.  Exercise of Option.  The option herein granted shall be deemed fully
exercised as to the Property if (i) on or before the date of closing under the 
Purchase Agreement as may be extended by amendment to the Purchase Agreement, 
the Buyer pays to Title, as defined in the Purchase Agreement attached hereto as
Exhibit B ("Exhibit B Purchase Agreement"), as Escrow Agent for both parties, 
the cash portion of the Option Fee, as hereafter defined, and delivers to Owner 
the non-cash portion of the Option Fee, namely, the Warrants, as hereafter 
defined; and (ii) the Buyer gives to the Owner, before the Option Termination 
Date, a written notice of election to purchase the Property.  Service of such 
notice shall be sufficient if served personally or if timely deposited in the 
United States mail addressed to Owner as hereinafter provided and received by 
Owner on or prior to the Option Termination Date.  Failure to timely provide 
such notice or timely pay the Option Fee to Owner and Title, shall automatically
terminate the option herein granted to Buyer and Title shall remit the cash 
portion of the Option Fee in its possession to Owner and any accrued interest 
thereon to Buyer.  Upon receipt by Title of the Option Fee and the receipt by 
Owner of the notice and the Warrants, the parties shall execute the Exhibit B 
Purchase Agreement.  The Option Fee shall consist of nonrefundable cash in the 
amount of $2,000,000.00 and nonrefundable warrants with a cashless exercise 
provision ("Warrants") to purchase 60,000 shares of Techne Corporation, during a
six (6) year period commencing on the first anniversary of its delivery, 
accompanied by registration rights specified in attached Exhibit E.  
Notwithstanding the foregoing or any other provision of this Option Agreement to
the contrary, the option granted hereunder shall not be exercisable and shall be
deemed null and void (i) in the event Buyer or Techne Corporation has not yet 
acquired from Owner the real property covered by the Purchase Agreement on or 
before the scheduled date of closing, as may be extended by an amendment to the 
Purchase Agreement; or (ii) provided Owner has acquired fee title to the 
property covered by the Phase II Option, in the event Buyer or Techne 
Corporation fails to pay Owner the Option Fee as stated in and required by the 
Phase II Option prior to the actual exercise of the option herein granted to 
Buyer; or (iii) in the event the entire Property is condemned prior to Buyer's 
exercise of the Option.  Upon execution of the Exhibit B Purchase Agreement by 
both parties, the Option Fee shall be deemed the "Deposit" as defined in the 
Exhibit B Purchase Agreement.

     3.  Purchase Price.  The purchase price for the Property shall be Seven
Million Nine Hundred Fifty-One Thousand and 00/100ths Dollars ($7,951,000.00) 
payable in cash to Owner at the closing plus the Warrants.  Buyer shall receive 
at closing as a credit against the purchase price for the cash portion of the 
Option Fee previously paid.  The purchase price shall be allocated between the 
following portions of the Property upon execution of the Exhibit B Purchase 
Agreement:

$______________ to 2101 Kennedy, $________________ to 659 Cleveland,

$_____________ to Triangular Portion and $_____________ to MT-BN parking lot.

     4.  Representations and Warranties by Owner.  Owner represents and warrants
to Buyer:

    (a) If Buyer duly exercises the option herein granted, Owner shall,
        subject to performance by Buyer of the covenants and agreements to be
        performed by it under the Exhibit B Purchase Agreement, execute and
        deliver to Buyer, at closing, as defined in the Exhibit B Purchase
        Agreement, a warranty deed ("Deed") conveying good and marketable title
        to the Property subject only to the exceptions ("Permitted
        Encumbrances") noted on Exhibit C hereto attached.  Owner will not
        place of record or cause to be incurred within thirty (30) days of the
        date of closing of the property pursuant to the Purchase Agreement any
        liens or encumbrances against the Property other than the Permitted
        Encumbrances.

    (b) To the extent commercially reasonable after any condemnation and/or
        casualty to the Property, Owner will continue to operate, maintain 
        and repair the Property as it is being currently operated, maintained 
        and repaired.

    (c) Owner will maintain fire and extended coverage insurance for at least
        $8,000,000.00 on the 2101 Kennedy Building and $350,000.00 on the 659
        Cleveland Building to the extent it can be economically purchased.  
        It is assumed that any aggregate increases of less than one hundred 
        percent (100%) of the current cost shall be economical.

    (d) Owner will not hereafter knowingly lease the Property to tenants who
        engage in the business of generation and/or storage of hazardous 
        materials and will insert in all new leases hereafter entered into a 
        prohibition of such business of generation and/or storage of 
        hazardous materials but the foregoing shall not be breached if any 
        tenant, without Owner's consent or knowledge engages in such 
        activities.  Owner will take appropriate action to terminate the 
        rights of any tenant who violates such prohibition.

    (e) Owner will have marketable and insurable record title to the Property
        as of closing, subject only to the Permitted Encumbrances.

    (f) To the best of Owner's knowledge, the information supplied to Buyer
        with respect to the Property including copies of leases, materials
        described in Exhibit C to the Purchase Agreement but excluding the
        materials described in Exhibit D to the Purchase Agreement is complete
        and correct.

    (g) At closing, Owner shall assign to the extent they are assignable, all
        of Owner's interest in the "Other Agreements" and "Leases" as defined
        in the Exhibit B Purchase Agreement.

    (h) Owner has not received any notice nor are they aware of any pending or
        threatened action to take by eminent domain or by deed in lieu thereof 
        all or any portion of the Property.

    (i) Owner shall be solely responsible for and shall pay on the date of
        closing any deferred tax or assessment, including, but not limited to, 
        those referred to in Minnesota Statutes Section 273.11 (the so-called 
        "Green Acres recapture"), catch-up or adjustment in future taxes due as 
        a result of the Property having been classified under any designation 
        authorized by law to obtain a special low ad valorem tax rate or
        receive either an abatement or deferment of ad valorem taxes.

    (j) Owner is not a "foreign person" as contemplated by Section 1445 of the
        Internal Revenue Code, and that at the closing Owner will deliver to 
        Buyer a certificate so stating, in a form complying with the Federal tax
        law.

    (k) This Option Agreement has been duly and validly authorized, executed and
        delivered by Owner and the obligations of Owner hereunder and thereunder
        are valid and legally binding, and this Option Agreement is enforceable 
        against Owner in accordance with its terms.

    (l) Except as shown by the materials described in Exhibit C and Exhibit D
        of the Purchase Agreement, except for acts of Buyer, as a possible 
        tenant of the Property and the use by Buyer of hazardous materials, 
        except for asbestos used as a building material for the Property and 
        except for an underground fuel oil tank located north of 2101 Kennedy 
        and an underground waste oil tank at 659 Cleveland, to the best of 
        Owner's knowledge, Owner has not generated, manufactured, buried, 
        spilled, leaked, discharged, emitted, stored, disposed of, used or 
        released any Hazardous Substance (as hereafter defined) about the 
        Property, except as may have occurred as a result of operating the 
        Property and in any such event such activities were at all times in 
        compliance with Environmental Laws as hereafter defined and has not 
        knowingly permitted any other party to do any of the same.  Except for 
        and to the extent of the matters specifically described in Exhibit C 
        and Exhibit D of the Purchase Agreement, except for acts of Buyer, as 
        a possible tenant of the Property and the use by Buyer of hazardous 
        materials, except for asbestos used as a building material for the 
        Property and except for an underground fuel oil tank located north of 
        2101 Kennedy and an underground waste oil tank at 659 Cleveland, Owner 
        has received no notice of and has no actual knowledge, without 
        inquiry (a) that any Hazardous Substance are or have ever been 
        generated, manufactured, buried, spilled, leaked, discharged, 
        emitted, stored, disposed of, used or released about the Property, 
        except as hereinbefore provided, or (b) of any, requests, notices, 
        investigations, demands, administrative proceedings, hearings, 
        litigation or other action proposed, threatened or pending relating 
        to any of the Property and alleging non-compliance with or liability 
        under any Environmental Law, or (c) that any above-ground or 
        underground storage tanks or other containment facilities of any kind 
        containing any Hazardous Substance are or have ever been located 
        about the Property, or (d) that Owner's operations on the Property 
        have been in compliance with all federal, state and local 
        environmental laws, ordinances, rules and regulations, relating to 
        the handling, storage and disposal of the Hazardous Material.  For 
        purposes hereof, Hazardous Substance means asbestos, urea 
        formaldehyde, polychlorinated biphenyls, nuclear fuel or materials, 
        radioactive materials, explosives, known carcinogens, petroleum 
        products and by-products (including crude oil or any fraction 
        thereof), and any pollutant, contaminant, chemical, material or 
        substance defined as hazardous or as a pollutant or a contaminant in, 
        or the use, manufacture, generation, storage, treatment, 
        transportation, release or disposal of which is regulated by, any 
        Environmental Law.  For purposes hereof, Environmental Law means any 
        federal, state, county, municipal, local or other statute, ordinance 
        or regulation which relates to or deals with the protection of the 
        environmental and/or human health and safety, including all 
        regulations promulgated by a regulatory body pursuant to any such 
        statute, ordinance, or regulation, including, the Comprehensive 
        Environmental Response and Liability Act of 1980 ("CERCLA"), as 
        amended, 42 U.S.C. Sectopm 9601 et. seq., the Resource Conservation
        and Recovery Act ("RCRA"), as amended, 42 U.S.C. Section 6901 et. seq.,
        the Federal Water Pollution Control Act, as amended, 33 U.S.C. Section
        1251 et. seq., the Clean Air Act, as amended, 42 U.S.C. Section 7401 et.
        seq., and Minnesota Statutes Section 115B.01 et seq.

    (m) To the best of Owner's knowledge, no unrecorded condition, restriction,
        obligation or agreement not previously disclosed to Buyer exists which 
        affect the Property or Buyer's ability to use the Property for the 
        Current Uses.

    (n) To the best of Owner's knowledge, no portion of the Property is located
        within an area designated as a "flood plain" or "flood prone area" under
        any statute, regulation, or ordinance.

    (o) To the best of Owner's knowledge, the Property is free from any use or
        occupancy restrictions, except those imposed by zoning laws and 
        regulations, and no part is dedicated or has been used as a cemetery or 
        burial ground.

    (p) To the best of Owner's knowledge, no fact or condition exists which
        would result in the termination of the current access to the Property 
        from any presently existing streets (except the parties' proposed 
        vacation of Cleveland Street (north of Kennedy Street and south of 
        Summer Street)) and roads adjoining or situated on the Property or to 
        any existing sewer or other utility facilities servicing, adjoining or 
        situated on the Property.  To the best of Owner's knowledge, all 
        utilities needed for Current Uses are available to the Property.

    (q) There is no litigation at law or in equity, and no action, litigation,
        investigation or proceedings of any kind, including, but not limited to,
        administrative or regulatory authority, pending or threatened against 
        the Property, or the Owner, or affecting the ability of Owner to 
        consummate the transaction contemplated herein and Owner knows of no 
        facts which could give rise to any such action, litigation, 
        investigation or proceeding with respect to the Property or the Owner.

    (r) To the best of Owner's knowledge, there are no outstanding citations or
        notices of violations of any statutes, ordinances or regulations of any 
        kind, with respect to the Property and to the best of Owner's knowledge,
        there are no structural defects in the Buildings including the roof, but
        the foregoing shall not be construed as a warranty for the roof of the 
        Buildings.

    (s) To the best of Owner's knowledge, (i) the Property is zoned for the
        Current Uses, (ii) the Property contains no wells, and (iii) the 
        Property does not contain any septic systems.

    (t) To the best of Owner's knowledge, except for a right that may be granted
        by Owner to RREEF Venture Capital Fund L.P., or any of its affiliates 
        (hereinafter "RREEF"), to purchase the Property which right shall be 
        contingent on the termination of this Option Agreement, no other party 
        has any right, title or interest in and to the Property, including the 
        right to purchase the Property, except as set forth as a Permitted 
        Encumbrance and except for the rights of tenants, as tenants only.  
        Owner represents and warrants that in the event it enters into a 
        purchase agreement with RREEF for the sale of the Property contingent 
        upon the termination of this Option Agreement, such purchase agreement 
        will be entered into only if RREEF executes a quitclaim deed in favor of
        Owner as to the Property to be placed in escrow with Title and to be 
        delivered upon Buyer's closing its purchase of the Property under the 
        Purchase Agreement.

    (u) Owner shall cure any violations of law or municipal ordinance, orders
        or requirements for which Owner had received a notice of violation 
        prior to the closing which would affect the Buyer's use of the 
        Property and which would be binding upon the Property or Buyer after 
        the closing, it being understood that the Property is to be renovated 
        upon its purchase and no such violation need be cured if as a result 
        of the renovation the violation becomes moot.

    (v) Owner, when it purchased the Property, was provided original Tenant
        Estoppel Certificates for the five tenants ("Five Tenants") in Suites 
        212 (Dwyer Sales), 309 (Sarah Ruplin), 312 (Schaffer Fine Art 
        Services, Inc.), 319 (David Walter) and Suites 204 & 15 (Jeff Rabkin) 
        indicating no renewal options existed despite lease language that may 
        indicate otherwise.  Owner has provided Buyer with copies of such 
        Tenant Estoppel Certificates.  Owner will not hereafter enter into 
        any new leases or enter into any new renewals of any leases, which do 
        not contain provisions allowing the landlord the right to terminate 
        such lease upon three months notice in the event of a sale of the 
        Property.  Except for the Five Tenants and subject to the 
        availability by the remaining tenants of bankruptcy laws or other 
        laws that may delay the enforcement of landlord's remedies, Owner 
        will use its best efforts to terminate existing leases prior to 
        July 1, 2002 if with notice of Buyer's exercise of the option herein 
        granted, Buyer agrees in writing to close on July 1, 2002 and not 
        before.

        None of the foregoing warranties shall be construed as a warranty as
        to the sufficiency of parking, it being understood that parking 
        requirements are dependent on the usage of the Property by the Buyer.

        Except for the foregoing warranties, Buyer acknowledges that it is 
        purchasing the Property in its "as is" condition relying solely on 
        its inspection and knowledge of the Property.

        Owner covenants that prior to the termination of this Option 
        Agreement, it will not knowingly take any affirmative action that 
        would purposely cause any of the representations and warranties 
        contained herein to be materially breached.  The sole and exclusive 
        remedy for Buyer under any theory of law for a breach by Owner of 
        this covenant shall be the return of the cash portion of the Option 
        Fee, if Buyer chooses not to exercise the option.  If Buyer exercises 
        the Option with knowledge of such breach by Owner, Buyer shall be 
        deemed to have waived such breach.

     5.  Right to Enter; Soil Tests; Surveys.  Prior to Buyer's exercise of the 
options herein granted to Buyer and subject to the rights of tenants, Buyer and 
its agents shall have the right to enter upon the Property for purposes of 
making soil tests, surveys, and engineering and architectural studies and tests.
Buyer hereby agrees to indemnify and hold harmless Owner from all liabilities, 
expenses and attorneys' fees incurred by Owner and arising out of such entry, or
the taking of such tests, surveys, analysis, studies and tests upon the 
Property.  This indemnification and hold harmless agreement shall survive 
termination or expiration of this Agreement and of the option granted under this
Agreement, exercise of the option, and/or consummation of the transaction herein
contemplated.  All results of surveys, topographies and tests will be forwarded 
to Owner and Buyer hereby consents to Owner utilizing the same, and if Buyer 
fails to exercise its option, all the originals of such materials will be deemed
the property of Owner and Buyer agrees to promptly furnish such originals at 
Owner's request.

     6.  No Commissions.  Each party represents and warrants to the other that
they have not incurred any real estate brokerage fees, finder's fees, or any 
other fees or commissions of any kind or nature due or owing to any third party 
as a result of the execution of this Option Agreement or as a result of the sale
of any of the Property.  Owner and Buyer each hereby indemnify the other against
and shall hold the other harmless from any and all claims, damages, costs or 
expenses of or for such fees or commissions that have been incurred by their 
actions.

     7.  Notices.  Any notice or election herein required or permitted to be
given or served by either party hereto upon the other shall be deemed given or
served in accordance with the provisions of this Agreement, if served
personally or if mailed by United States registered or certified mail,
postage prepaid, properly addressed as follows:

     If to Owner:     Hillcrest Development
                      2424 Kennedy Street NE
                      Minneapolis, MN  55413
                      Attention:  Scott M. Tankenoff

     with a copy to:  Maun & Simon, PLC
                      2000 Midwest Plaza Building West
                      801 Nicollet Mall
                      Minneapolis, MN  55402
                      Attention: Charles Bans, Esq.

     If to Buyer:     R & D Systems, Inc.
                      614 McKinley Place
                      Minneapolis, MN  55413
                      Attention:  Tom Oland, CEO

     with a copy to:  Fredrikson & Byron, P.A.
                      900 Second Avenue South, Suite 1100
                      Minneapolis, MN  55402
                      Attention:  Chuck Diessner

Each mailed notice of communication shall be deemed to have been given when 
served upon, the party to which addressed or if mailed on the date the same 
is actually received by the addressee.  The addresses to which notices are to
be mailed to either party hereto may be changed by such party by giving 
written notice thereof to the other party in the manner above provided.

     8.  Successors and Assigns.  This Agreement shall be binding upon and inure
to the benefit of the parties hereto, and their respective successors and 
assigns.  It is expressly agreed that this Agreement shall be assignable by 
Buyer; provided, however, that no such assignment shall be valid unless written 
notice thereof has been first provided to Owner.

     9.  Recording.  The parties agree to simultaneously execute a recordable
memorandum of Option Agreement ("Memorandum") in the form of Exhibit D hereto 
attached for purposes of memorializing of record this Agreement.  Buyer shall 
deposit upon execution of this Agreement in escrow with Title a quitclaim deed 
to the Property in favor of Owner in the event Buyer fails to consummate its 
purchase from Owner of the Property but Title shall not release the quitclaim 
deed from escrow and/or record the deed until after Title has provided Buyer 
with at least five (5) days prior written notice.

     10.  Condemnation.  If any portion of the Property but not the entire
Property is condemned prior to the exercise of the option herein granted, any 
proceeds received by Owner shall first be applied by Owner to restore the 
Property to the extent commercially reasonable, and the balance, if any, applied
against the Purchase Price if the option is exercised and Buyer consummates its 
purchase of the Property pursuant to the Exhibit B Purchase Agreement.  If the 
entire Property is condemned prior to the exercise of the option, this option
shall be null and void and fifty percent (50%) of the cash portion of the Option
Fee previously paid by Buyer to Owner shall be refunded to Buyer.

     11.  Casualty.  If any "major" damage to the 2101 Kennedy Building occurs
prior to the exercise of the option granted herein, Buyer shall elect within 
thirty (30) days of notice from Owner as to the amount of insurance proceeds to 
be received by Owner whether Buyer (i) wishes to terminate its rights under this
Option Agreement, or (ii) wishes to then exercise its option and close pursuant 
to the Exhibit B Purchase Agreement (without regard to the provisions therein as
to casualty and damage) with a credit against the Purchase Price equal to the 
actual insurance proceeds received by Owner but in no event shall such credit 
exceed the excess of the Purchase Price over one-half of the cash portion of the
Option Fee.  If any "minor" damage to the 2101 Kennedy Building occurs prior to 
the exercise of the option granted herein, Owner must use the available 
insurance proceeds to restore such building unless within thirty (30) days of 
notice from Owner as to the amount of insurance proceeds to be received by 
Owner, Buyer elects to exercise its option and close pursuant to the Exhibit B 
Purchase Agreement (without regard to the provisions therein as to casualty and 
damage) with Buyer receiving a credit against the Purchase Price equal to the 
actual insurance proceeds received by Owner but in no event shall such credit 
exceed the excess of the Purchase Price over one-half of the cash portion of the
Option Fee.

     If any damage occurs to the 659 Cleveland Building prior to Buyer's
exercise of its option herein granted, Owner can solely elect whether to restore
such building or in the event Buyer exercises its option to give a credit to 
Buyer against the Purchase Price of any applicable insurance proceeds received 
by Owner but in no event shall such credit exceed the excess of the Purchase 
Price over one-half of the cash portion of the Option Fee.

     For purposes of this paragraph 11, a "major" damage is defined as damage
more than 25% of the value of the 2101 Kennedy Building and a "minor" damage is 
defined as damage to such building in an amount less than or equal to twenty-
five percent (25%) of the value of such building.

     12.  Proposed Vacation of Cleveland Street.  It is contemplated by the
parties that part of Cleveland Street lying north of Kennedy Street and south of
Summer Street will be vacated by Owner and the parties agree that upon such 
vacation, the easterly one-half of the vacated street shall accrue to the 
Property with the westerly one-half accruing to the property common known as 
2001 Kennedy and the parties will execute and deliver such deeds as are 
necessary to accomplish the same.

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement the day
and year first above written.

OWNER:                          BUYER:

Hillcrest Development           R & D Systems, Inc.


By: /s/ Scott Tankenoff         By: /s/ Thomas E. Oland
   Its:  General Partner           Its:  President



                         ACKNOWLEDGMENT BY TITLE

     The undersigned acknowledges receipt of a copy of the foregoing and agrees 
to act as Escrow Agent for the parties and to invest the cash portion of the 
Option Fee in an interest-bearing federally insured bank account.
                                 First American Title Insurance Company


                                 By: /s/ Rodney D. Ives
                                    Its: Assistant Vice President



                                EXHIBIT B
                             PURCHASE AGREEMENT
                           (2101 Kennedy Option)


     THIS AGREEMENT is entered into this _____ day of __________, ______, by 
and between Hillcrest Development, a Minnesota limited partnership (hereafter 
referred to as the "Seller"), and R & D Systems, Inc., a Minnesota corporation, 
(the "Buyer"), upon the basis of the following facts, understandings and 
intentions of Seller and Buyer.

     RECITALS:

     1.  Seller is the fee simple owner of real properties ("Land") improved
with buildings ("Buildings") commonly known as 2101 Kennedy and 659 Cleveland 
and is the fee simple owner of real property used for surface parking lots 
("Parking Land") commonly known as the "Triangular Portion" and the MT-BN Lot, 
all of which are located in the City of Minneapolis, County of Hennepin, State 
of Minnesota, and legally described in Exhibit A hereto attached.

     2.  Buyer has pursuant to an Option Agreement ("Option Agreement") duly
exercised an option granted by Seller to purchase the Land, the Buildings, the 
Parking Land, and all licenses, permits, equipment, fixtures and furnishings and
all other personal property, tangible or intangible, owned by Seller and 
currently located on the Land and solely used in the operation and maintenance 
of the foregoing (hereafter said licenses, permits, equipment, fixtures and 
furnishings and other included personal property shall be referred to in the 
aggregate as "Personal Property," and hereafter the Land, the Building, the 
Parking Land, and Personal Property is sometimes referred to in the aggregate as
the "Property") in accordance with the terms and conditions hereinafter set 
forth.

     3.  Seller is willing to grant and extend to Buyer such purchase right as
the terms hereafter set forth.

     NOW, THEREFORE, in consideration of the agreements hereinafter provided and
other good and valuable consideration, Seller agrees to sell and Buyer agrees to
purchase from Seller the Property, together with and including all 
hereditaments, appurtenances, easements and rights of way thereunto belonging or
in any way appertaining and also the right, title and interest (if any) of 
Seller in and to the bounding and abutting streets, alleys and highways, subject
to and upon the following terms and conditions:


                                SECTION I
                              PURCHASE PRICE
     It is hereby agreed that the Purchase Price of the Property shall be Seven 
Million Nine Hundred Fifty-One Thousand and 00/100 Dollars ($7,951,000.00) plus 
nonrefundable warrants ("Warrants") with a cashless exercise provision to 
purchase 60,000 shares of Techne Corporation, during a six (6) year period 
commencing on the first anniversary of its delivery accompanied by registration 
rights of the stock purchased pursuant to the Warrants specified in Exhibit D 
hereto attached (the "Purchase Price"), which shall be paid by Buyer to Seller 
as follows:

    (i)  $2,000,000.00 has already been paid into escrow as provided for in
         Section II below.  

    (ii) The Warrants have already been delivered to Seller.

    (iii) The remainder of the Purchase Price, namely, $5,951,000.00 will be 
          payable at closing in immediately available funds.

    The Purchase Price shall be allocated as follows:

    $_________________ to 2101 Kennedy;
    $_________________ to 659 Cleveland;
    $_________________ to Triangular Portion; and
    $_________________ to MT-BN Lot.


                                    SECTION II
                             EARNEST MONEY DEPOSIT

     Buyer has already deposited in escrow with First American Title Insurance
Company (the "Escrow Agent" and sometimes hereafter "Title") the sum of 
$2,000,000.00, (this sum plus all accrued interest thereon shall be referred to 
as the "Deposit") which shall be retained by the Escrow Agent for the benefit of
Seller and Buyer in accordance with the provisions of this Purchase Agreement.  
The parties hereby agree to execute such documentation, if any, reasonably 
required by the Escrow Agent in connection with the disbursement of the Deposit
and establishment of said earnest money escrow referenced above.


                                   SECTION III
                        INVESTMENT AND DISBURSEMENT OF DEPOSIT

     The Escrow Agent is hereby directed to invest the Deposit represented by
cash in a segregated U.S. Treasury-backed money market account with U.S. Bancorp
in Minneapolis, Minnesota.

     The Deposit shall be disbursed by the Escrow Agent as follows:

          (a)  Except as provided for in (b) or (c) below, the Deposit shall
     be deemed nonrefundable and shall be delivered to Seller either upon the 
     termination of this Purchase Agreement or upon the closing of the sale 
     of the Property as partial payment of the Purchase Price.

          (b)  Fifty percent (50%) of the Deposit shall be delivered to Buyer 
     in the event: (i) Buyer terminates this Purchase Agreement pursuant to 
     Sections IV, V, VI or XII (in the event Buyer terminates this Purchase 
     Agreement because Seller is in material breach of its representations 
     and warranties other than pursuant to the last paragraph of Section IX) 
     hereof; (ii) Buyer terminates this Purchase Agreement pursuant to 
     Section XVI hereof; (iii) Buyer terminates this Purchase Agreement 
     pursuant to Section XVII hereof.

          (c)  One hundred percent (100%) of the Deposit shall be delivered 
     to Buyer in the event Buyer chooses to terminate this Purchase Agreement 
     pursuant to the last paragraph of Section IX, the last paragraph of 
     Section XII, or as a result of Seller refusing to perform any of its 
     obligations set forth herein pursuant to Section XII other than a breach 
     of its representations and warranties.

          (d)  Interest in the Deposit shall inure to the benefit of Buyer, 
     in all events.


                                 SECTION IV
                          BUYER'S CONDITIONS PRECEDENT

     Seller agrees that this Purchase Agreement shall be conditioned upon Buyer
satisfying itself, in its sole and absolute judgment, that the following 
conditions precedent with respect to the Property are met:

          (a)  Buyer's inspection and approval of the Land, the Building, the
     Parking Land, Personal Property, the Other Agreements (as hereinafter 
     defined) and all other information required herein to be provided to 
     Buyer by Seller, all during regular weekday business hours.  Seller 
     agrees to allow Buyer and its agents the right of any ingress or egress 
     over and through the Property for the purpose of inspecting the same and 
     making other observations as Buyer deems reasonably necessary.  Buyer 
     agrees to indemnify and hold Seller harmless from all injury, death or 
     property damage or claims of any kind whatsoever including mechanic's 
     liens arising out of or in any way incidental to Buyer's presence on the 
     Property for the purposes aforesaid.  This indemnity shall survive the 
     termination of this Purchase Agreement, regardless of which party elects 
     to terminate this Purchase Agreement.  To the extent Seller has not 
     already done so, Seller agrees to provide to Buyer copies of or allow 
     Buyer access to the following items within ten (10) days from the 
     execution of this Purchase Agreement:

               (i)  copies of Plans and Specifications, blueprints, 
          operating manuals, surveys and licenses, if any, in Seller's 
          possession, used to operate the Buildings and the remainder of the 
          Property;

               (ii) complete copies of all contracts ("Other Agreements") 
          and leases ("Leases") currently affecting the Property;

               (iii) copies of all permits or authorizations, if any, in 
          Seller's possession, required to be issued by any governmental 
          body having jurisdiction in connection with any state of facts or 
          activity presently existing or being carried on with respect to 
          the Property;

               (iv) copies of all warranties and guaranties, if any, which 
          are still effective and which pertain to the Property or any 
          portion thereof ("Warranties");

               (v)  inventory of the Personal Property owned by the Seller 
          and located on the Land and used in connection with the operation 
          of the Property;

          (b)  Buyer may use the Property for its existing uses and its uses 
     of the property located at 2201 Kennedy, 614 McKinley and 640 McKinley, 
     as of February, 1999 ("Current Uses") without being in violation of any 
     zoning classification, land use classification, environmental 
     requirement, or any other use classification or building classification 
     or requirement established by any entity or authority having legal 
     jurisdiction or authority thereover.

          (c)  All utilities, including but not limited to electricity, gas, 
     water (fire and domestic) storm and sanitary sewer, are available on 
     site, through valid and adequate public or private easements for Current 
     Uses; provided that in the case of private easements, they are 
     appurtenant to the Property, or on the Property's side of abutting 
     streets of size and capacity sufficient to serve the Current Uses.

          (d)  Buyer approving, as provided in Section V(A) hereof, any
     environmental audits for the Property.

          (e)  Within thirty (30) days of the date of this Purchase 
     Agreement, Seller shall provide Buyer with original estoppel 
     certificates from all tenants of the Property in form reasonably 
     acceptable to Buyer to the extent Seller is able to obtain the same by 
     exercising its best effort.

     This Purchase Agreement shall be deemed terminated and neither party liable
to the other herein unless Buyer affirmatively accepts or waives in writing to 
Seller the foregoing conditions by January 15, 2002.  Upon any such termination 
of this Purchase Agreement by Buyer failing to waive or accept all of the 
foregoing conditions or as provided in the last sentence of this Section, all 
parties hereto shall be released from all duties and obligations to each other 
contained herein (except for Buyer's Indemnity under Sections IV(a) and V(A) 
hereof) and upon such termination Buyer shall be entitled to a partial or full 
refund of the Deposit as described in Sections III(b) or III(c) hereof.  
Notwithstanding the foregoing, Buyer may elect to terminate this Purchase 
Agreement between January 15, 2002 and the date of closing in the event (i) 
environmental testing done between such dates pursuant to Section V hereof 
reveal a contamination previously unknown on January 15, 2002, or (ii) a change 
in any item referred to in (b) above occurs between January 15, 2002 and the 
date of closing so as to prohibit the use of the Property for Current Uses.


                                SECTION V
                          ENVIRONMENTAL AUDITS AND SURVEY

     A.  Environmental Audits.  Seller has provided to Buyer prior to January 6,
1999 environmental reports ("Environmental Reports") for the Property at no cost
or expense to Buyer which are described in Exhibit C hereto attached and that 
except for the "Exhibit D" information described in paragraph 4(l) of the Option
Agreement, to the best of Seller's knowledge, such materials constitute all of 
the environmental reports in Seller's possession or control.  Buyer shall have 
the right to do additional environmental audits and/or soil tests subject to the
reasonable prior written approval of Seller regardless of the cost as long as 
Buyer pays for all of such costs; provided, however, no such additional testing
shall be done beyond January 15, 2002 unless the testing is based on new 
information not previously known to Buyer.  If such additional tests reveal the
presence of any material amounts of hazardous materials not disclosed in the 
Environmental Reports, and not otherwise "known" to Buyer as of July 1, 1999,
Buyer may terminate this Purchase Agreement by giving Seller notice of the same
prior to (i) January 15, 2002 for the discovery of such materials prior thereto
or (ii) the closing date for the discovery of such materials after January 15, 
2002 and prior to the closing date and upon such termination Buyer shall be 
entitled to a partial or full refund of the Deposit as described in Sections 
III(b) or III(c) hereof.  Buyer shall be deemed to have "known" of any hazardous
materials if Buyer had in its possession copies of materials describing such 
hazardous materials as of July 1, 1999.  Buyer agrees to indemnify and hold 
Seller harmless from all mechanic's liens liability and other costs and 
expenses arising from Buyer's doing such additional environmental audits and/or
soil tests.  The foregoing indemnity shall survive the termination of this 
Purchase Agreement.

     B.  Survey.  Seller has provided Buyer with a survey ("Survey") of the
Property.  

     C.  Copies of Documents.  To the extent not already done, Seller shall
promptly deliver to Buyer or make available to Buyer copies of all soil tests, 
environmental audits, surveys and other documents relating to the physical 
properties of the Property which are within Seller's control and Buyer agrees to
promptly deliver to Seller copies of all of such items which are within Buyer's 
control.


                                    SECTION VI
                                   TITLE EVIDENCE
     A.  Seller will, at Seller's expense, provide Buyer within fourteen (14)
days after the date hereof with a commitment(s) (the "Commitment") for an 
Owner's Policy of Title Insurance for the Property issued by Title along
with updated Surveys certified to Title, Buyer, Techne Corporation and Buyer's
lender.  Buyer shall pay at closing the premium for the actual title insurance
policy, if any, to be purchased by Buyer.  The Commitment shall include waiver
of standard exceptions, a zoning and comprehensive endorsements and a contiguity
endorsement as to the Land and each separate parcel comprising the Parking Land
and shall include legible copies of all documents, maps, or plats set forth 
therein as affecting the Property and shall be issued through Title in its 
capacity as a title insurance company by its local office or by its local 
agent (the "Title Company") situated in the county where the Property is 
located.  The Commitment shall be issued in the name of Buyer, Techne 
Corporation and Buyer's lender.

     B.  Within thirty (30) days after receiving the Commitment and the updated
Surveys, Buyer shall deliver to Seller a written statement containing any 
objection Buyer has to the state of title, including Survey objections but 
excluding objections to Permitted Encumbrances and excluding matters described 
by surveys provided to Buyer prior to February 26, 1999.  If such statement of 
objection is not delivered by such date, title shall be deemed approved by Buyer
except for Schedule B, Section 1 requirements of the commitment ("Requirements")
which Seller agrees to satisfy at closing.  If any objection other than the 
Requirements is not cured or removed by the closing date, Buyer, at its option, 
may, prior to the closing date, either (i) accept title as it is, subject to 
Seller's obligations to satisfy the Requirements; or (ii) terminate this 
Purchase Agreement.  Seller shall have no obligations to cure any Permitted 
Encumbrances.  Upon any such termination all parties shall be released from all 
duties or obligations contained herein (except for Buyer's Indemnity under 
Sections IV(a) and V(A) hereof) and Buyer shall be entitled to a partial or full
refund of the Deposit as described in Sections III(b) or III(c) hereof.


                                    SECTION VII
                                   1031 EXCHANGE

     At either party's request, the other party agrees to cooperate with the 
requesting party in a deferred or simultaneous Section 1031 like kind 
exchange(s) of all or any portion of the Property for which the Purchase 
Price has been separately allocated herein as long as the other party is not 
required to take title to any other property or to incur any further cost, 
expense, liability or delay.  The Deposit of $2,000,000.00 in the event of 
any such exchange shall be allocated to 2101 Kennedy.


                                  SECTION VIII
                            VACATION OF CLEVELAND STREET

     If at the date of execution of this Purchase Agreement that part of
Cleveland Street lying north of Kennedy Street and south of Summer Street has
been or is in the process of being vacated, it is agreed between the parties 
that the easterly one-half of the vacated street shall accrue to the Land with
the westerly one-half accruing to the property commonly known as 2001 Kennedy
and the parties will execute and deliver such deeds as are necessary to 
accomplish the same.  Seller shall pay the expenses of such vacation except 
that neither the Seller nor the Buyer shall have any obligation to pay any
sums attributable to the value of the vacated street which the City may
attempt to impose.


                                   SECTION IX
                                   WARRANTIES

     Seller warrants and represents to Buyer that the following statements are
as of February 26, 1999, the date hereof, at closing and after closing to the 
extent hereinafter provided, will be true and accurate, except for such material
changes (other than changes resulting from the affirmative and purposeful acts 
of Seller contemplated by the last paragraph of this Section IX), that Seller 
has notified Buyer in writing at the time of Seller's execution of this Purchase
Agreement:

          (a)  Seller will have marketable and insurable record title to the
     Property as of closing, subject only to the Permitted Encumbrances 
     listed on Exhibit B attached hereto and made a part hereof.

          (b)  To the best of Seller's knowledge, the information supplied to 
     Buyer pursuant to Section IV(a) hereof is complete and correct except 
     for the materials described in the Option Agreement as "Exhibit D to the 
     Purchase Agreement" and has been duly supplemented including, but not 
     limited to, any new Other Agreements.

          (c)  At closing, Seller shall (i) convey to Buyer by Warranty Deed 
     the Property and convey by Warranty Bill of Sale the Personal Property 
     to Buyer free of all encumbrances on the Property or any portion thereof 
     except for the Permitted Encumbrances and other matters approved by 
     Buyer pursuant to Section VI or as otherwise provided herein; and (ii) 
     shall assign to the extent they are assignable, all of Seller's interest 
     in the "Other Agreements" and the Leases, if any.

          (d)  Seller has not received any notice nor are they aware of any 
     pending or threatened action to take by eminent domain or by deed in 
     lieu thereof all or any portion of the Property.

          (e)  Seller shall be solely responsible for and shall pay on the 
     date of closing any deferred tax or assessment, including, but not 
     limited to, those referred to in Minnesota Statutes Section 273.11 (the 
     so-called "Green Acres recapture"), catch-up or adjustment in future 
     taxes due as a result of the Property having been classified under any 
     designation authorized by law to obtain a special low ad valorem tax 
     rate or receive either an abatement or deferment of ad valorem taxes.

          (f)  Seller is not a "foreign person" as contemplated by Section 
     1445 of the Internal Revenue Code, and that at the closing Seller will 
     deliver to Buyer a certificate so stating, in a form complying with the 
     Federal tax law.

          (g)  This Purchase Agreement and the documents, instruments and 
     agreements to be executed by Seller pursuant to this Purchase Agreement 
     have been, or will be on or before the date of closing, duly and validly 
     authorized, executed and delivered by Seller and the obligations of 
     Seller hereunder and thereunder are or will be valid and legally 
     binding, and this Purchase Agreement and the documents, instruments and 
     agreements to be executed and delivered by Seller pursuant to this 
     Purchase Agreement are or will be upon such execution and delivery 
     enforceable against Seller in accordance with their respective terms.

          (h)  Except as shown by the materials described in Exhibit C and 
     Exhibit D to the Purchase Agreement (as defined in the Option 
     Agreement), except for acts of Buyer, as a possible tenant of the 
     Property and the use by Buyer of hazardous materials, except for 
     asbestos used as a building material for the Property and except for an 
     underground fuel oil tank located north of 2101 Kennedy and an 
     underground waste oil tank at 659 Cleveland, to the best of Seller's 
     knowledge, Seller has not generated, manufactured, buried, spilled, 
     leaked, discharged, emitted, stored, disposed of, used or released any 
     Hazardous Substance (as hereafter defined) about the Property, except as 
     may have occurred as a result of operating the Property and in any such 
     event such activities were at all times in compliance with Environmental 
     Laws (as hereinafter defined), and has not knowingly permitted any other 
     party to do any of the same.  Except for and to the extent of the 
     matters specifically described in said Exhibit C and Exhibit D, except 
     for acts of Buyer, as a possible tenant of the Property and the use by 
     Buyer of hazardous materials, except for asbestos used as a building for 
     the Property and except for an underground fuel oil tank located north 
     of 2101 Kennedy and an underground waste oil tank at 659 Cleveland, 
     Seller has received no notice of and has no actual knowledge, without 
     inquiry (a) that any Hazardous Substance are or have ever been 
     generated, manufactured, buried, spilled, leaked, discharged, 
     emitted, stored, disposed of, used or released about the Property, 
     except as hereinabove provided, or (b) of any, requests, notices, 
     investigations, demands, administrative proceedings, hearings, 
     litigation or other action proposed, threatened or pending relating 
     to any of the Property and alleging non-compliance with or liability 
     under any Environmental Law, or (c) that any above-ground or 
     underground storage tanks or other containment facilities of any kind 
     containing any Hazardous Substance are or have ever been located 
     about the Property, or (d) that Seller's operations on the Property 
     have been in compliance with all federal, state and local 
     environmental laws, ordinances, rules and regulations, relating to 
     the handling, storage and disposal of the Hazardous Material.  For 
     purposes hereof, Hazardous Substance means asbestos, urea 
     formaldehyde, polychlorinated biphenyls, nuclear fuel or materials, 
     radioactive materials, explosives, known carcinogens, petroleum 
     products and by-products (including crude oil or any fraction 
     thereof), and any pollutant, contaminant, chemical, material or 
     substance defined as hazardous or as a pollutant or a contaminant in, 
     or the use, manufacture, generation, storage, treatment, 
     transportation, release or disposal of which is regulated by, any 
     Environmental Law.  For purposes hereof, Environmental Law means any 
     federal, state, county, municipal, local or other statute, ordinance 
     or regulation which relates to or deals with the protection of the 
     environmental and/or human health and safety, including all 
     regulations promulgated by a regulatory body pursuant to any such 
     statute, ordinance, or regulation, including, the Comprehensive 
     Environmental Response and Liability Act of 1980 ("CERCLA"), as 
     amended, 42 U.S.C. Section 9601 et. seq., the Resource Conservation and
     Recovery Act ("RCRA"), as amended, 42 U.S.C. Section 6901 et. seq., the 
     Federal Water Pollution Control Act, as amended, 33 U.S.C. Section 1251
     et. seq., the Clean Air Act, as amended, 42 U.S.C. Section 7401 et. seq.,
     and Minnesota Statutes Section 115B.01 et seq.

          (i)  To the best of Seller's knowledge, no unrecorded condition, 
     restriction, obligation or agreement not previously disclosed to Buyer 
     pursuant to Section IV hereof shall exist which affect the Property or 
     Buyer's ability to use the Property for the Current Uses.

          (j)  To the best of Seller's knowledge, no portion of the Property 
     is located within an area designated as a "flood plain" or "flood prone 
     area" under any statute, regulation, or ordinance.

          (k)  To the best of Seller's knowledge, the Property is free from 
     any use or occupancy restrictions, except those imposed by zoning laws 
     and regulations, and no part is dedicated or has been used as a cemetery 
     or burial ground.

          (l)  To the best of Seller's knowledge, except for the anticipated 
     vacation of Summer and Cleveland Street, no fact or condition exists 
     which would result in the termination of the current access to the 
     Property from any presently existing streets  and roads adjoining or 
     situated on the Property or to any existing sewer or other utility 
     facilities servicing, adjoining or situated on the Property.  To the 
     best of Seller's knowledge, all utilities needed for Current Uses are 
     available to the Property.

          (m)  There is no litigation at law or in equity, and no action, 
     litigation, investigation or proceedings of any kind, including, but not 
     limited to, administrative or regulatory authority, pending or 
     threatened against the Property, or the Seller, or affecting the ability 
     of Seller to consummate the transaction contemplated herein and Seller 
     knows of no facts which could give rise to any such action, litigation, 
     investigation or proceeding with respect to the Property or the Seller.

          (n)  To the best of Seller's knowledge, there are no outstanding 
     citations or notices of violations of any statutes, ordinances or 
     regulations of any kind, with respect to the Property and to the best of 
     Seller's knowledge, there are no structural defects in the Buildings 
     including the roof, but the foregoing shall not be construed as a 
     warranty for the roof of the Buildings.

          (o)  To the best of Seller's knowledge, (i) the Property is zoned 
     for the Current Uses without being in violation of any zoning 
     classification, land use classification, environmental requirement, or 
     any other use classification or building classification or requirement 
     established by any entity or authority having legal jurisdiction or 
     authority thereover, (ii) the Property contains no wells, and (iii) the 
     Property does not contain any septic systems.

          (p)  To the best of Seller's knowledge, except for the rights of 
     existing tenants, if any, as tenants only, no other party has any right, 
     title or interest in and to the Property, including the right to 
     purchase the Property, except as set forth as a Permitted Encumbrance.

          (q)  Except for requirements imposed by the City of Minneapolis 
     relating solely to Buyer's anticipated improvements to the Property and 
     not to preexisting conditions, Seller shall cure any violations of law 
     or municipal ordinance, orders or requirements for which Seller had 
     received a notice of violation prior to the closing which would affect 
     the Buyer's use of the Property and which would be binding upon the 
     Property or Buyer after the closing, it being understood that the 
     Property is to be renovated upon its purchase and no such violation need 
     be cured if as a result of the renovation the violation becomes moot.

          (r)  Seller will use its best efforts to obtain tenant estoppel 
     certificates from all tenants as provided in Section IV(e).

          (s)  To the extent commercially reasonable after any condemnation 
     and/or casualty to the Property, Owner will continue to operate, 
     maintain and repair the Property as it is being currently operated, 
     maintained and repaired.

          (t)  Seller will maintain fire and extended coverage insurance 
     for at least $8,000,000.00 on the 2101 Kennedy Building and 
     $350,000.00 on the 659 Cleveland Building to the extent it can be 
     economically purchased.  It is assumed that any aggregate increases 
     of less than one hundred percent (100%) of the current cost shall be 
     economical.

          (u)  Seller will not hereafter knowingly lease the Property to 
     tenants who engage in the business of generation and/or storage of 
     hazardous materials and will insert in all new leases hereafter 
     entered into a prohibition of such business of generation and/or 
     storage of hazardous materials but the foregoing shall not be 
     breached if any tenant, without Seller's consent or knowledge engages 
     in such activities.  Seller will take appropriate action to terminate 
     the rights of any tenant who violates such prohibition.

          (v)  Seller, when it purchased the Property, was provided 
     original Tenant Estoppel Certificates for the five tenants ("Five 
     Tenants") in Suites 212 (Dwyer Sales), 309 (Sarah Ruplin), 312 
     (Schaffer Fine Art Services, Inc.), 319 (David Walter) and Suites 204 
     & 15 (Jeff Rabkin) indicating no renewal options existed despite 
     lease language that may indicate otherwise.  Seller has provided 
     Buyer with copies of such Tenant Estoppel Certificates.  Seller will 
     not hereafter enter into any new leases or enter into any new 
     renewals of any leases, which do not contain provisions allowing the 
     landlord the right to terminate such lease upon three months notice 
     in the event of a sale of the Property.  Except for the Five Tenants 
     and subject to the availability by the remaining tenants of 
     bankruptcy laws or other laws that may delay the enforcement of 
     landlord's remedies, Seller will use its best efforts to terminate 
     existing leases prior to July 1, 2002 if with notice of Buyer's 
     execution of this Purchase Agreement, Buyer agrees in writing to 
     close on July 1, 2002 and not before.

          (w)  Seller will continue through closing to maintain insurance 
     coverages on the Property as required by the Option Agreement.

          (x)  If not already done, the Seller, at its sole cost and 
     expense, shall proceed immediately after the date of this Purchase 
     Agreement to complete prior to the closing date the subdivision of 
     the various parcels that will become the MT-BN Lot to be conveyed 
     hereunder.

     None of the foregoing warranties shall be construed as a warranty as 
     to the sufficiency of parking, it being understood that parking 
     requirements are dependent on the usage of the Property by the Buyer.

     Except for the foregoing warranties, Buyer acknowledges that it is 
     purchasing the Property in its "as is" condition relying solely on its 
     inspection of the quantity and quality of the Property including the 
     floor, the structural portions of the Property and the roof.  The 
     foregoing warranties will survive the closing until December 31, 2002 
     ("Final Action Date").  The parties agree that all actions commenced by 
     Buyer against Seller based on such representations and warranties shall 
     be deemed time barred unless such actions have been commenced prior to 
     the Final Action Date or such claims are based on fraud, it being 
     understood that except for claims based on fraud, Buyer shall be deemed 
     to have released Seller for any claims based on such representations and 
     warranties unless an action based thereon is commenced prior to Final 
     Action Date.

     Seller covenants that, at any time prior to the closing, it has not 
     and will not knowingly take(n) any affirmative action that would 
     purposely cause the representations and warranties contained herein 
     to be materially breached.  The sole and exclusive remedy for Buyer 
     under any theory of law for a breach by Seller of this covenant shall 
     be the termination of this Agreement and the return of the Deposit 
     pursuant to Section III(c), if Buyer chooses not to close.  If Buyer 
     chooses to close with knowledge of such breach by Seller, Buyer shall 
     be deemed to have waived such breach.

                                     
                                     SECTION X 
                                      CLOSING

     The closing of this transaction shall take place in the office of Title in
Minneapolis, Minnesota on or before July 1, 2002, notwithstanding any other 
provision hereof to the contrary.  Possession of the Property shall be deemed to
have been given by Seller to Buyer coincident with the closing.  The following 
procedure shall govern the closing:

          (a) Prior to closing, Seller shall deliver to Buyer and Title a
     copy of the proposed general Warranty Deed (the "Deed") which shall be 
     in recordable form and shall convey good and marketable record title to 
     the Property (using the legal descriptions set forth on the Title 
     Commitment and the Survey) to Buyer, subject only to the Permitted 
     Encumbrances and other matters approved by Buyer.  If the form of the 
     Deed does not comply with the provisions set forth above, the Seller 
     shall promptly correct the same upon notice from either Buyer or the 
     Title Company.

          (b) On or before the closing Seller shall deliver to the Title 
     Company or Buyer the following:

               (i) the Deed, properly executed and acknowledged along with 
          a standard form Seller's Affidavit;

               (ii) current real estate tax statements;

               (iii) any applicable owner's duplicate certificate(s) of 
          title to the Property;

                (iv) intentionally deleted;

                (v)  a warranty bill of sale properly executed for all 
          Personal Property;

                (vi) properly executed assignments of all Seller's interest 
          in and to the Leases and Other Agreements and which shall provide 
          that Seller will indemnify and hold Buyer harmless from all claims 
          under the foregoing which accrued on or prior to closing and Buyer 
          shall agree to indemnify and hold Seller harmless from all claims 
          under the foregoing which accrue after the closing;

                (vii) a well certificate as may be required by applicable law 
          or in the event it is not required, a certification in the deed 
          that there are no wells on the Property;

                (viii) an assignment of the Warranties and any other 
          documents required by this Purchase Agreement;

                (ix) any other documentation reasonably requested by the 
          Title Company in order to confirm the authority of the Seller to 
          consummate this transaction or to permit the Title Company to 
          issue to Buyer, upon completion of the closing, its Owner's Title 
          Insurance Policy in an amount equal to the Purchase Price, subject 
          only to those matters shown on the Commitment which were approved 
          by Buyer (the "Title Policy"); Provided, however, that the 
          foregoing shall not be construed to obligate Seller to provide any 
          indemnity or to pay any sums not otherwise required to be paid by 
          Seller hereunder;

                (x) such funds as may be required by Seller to pay closing 
          costs or charges properly allocable to Seller.

          (c) On or before the closing, Buyer shall deliver to Title or 
     Seller the following:

                (i) the balance of the cash due at closing, less any 
          amounts for which Buyer is to receive a credit;

                (ii) such additional funds as may be required of Buyer to 
          pay closing costs or charges properly allocable to Buyer.

          (d) After Title has received all of the items to be deposited 
     with it, and when it is in a position to issue the Title Policy 
     reflected by the approved Commitment, Title shall:

                (i) record the Deed;

                (ii) record any other instruments executed by the parties, 
          or either of them, which are contemplated by this Purchase 
          Agreement to be placed of record, instructing the Recorder's 
          Office to return the same to the beneficiary thereof;

                (iii) issue to Buyer its Title Policy and deliver to Buyer 
          all other documents to be herein delivered by Seller to the Title 
          Company pursuant to this Purchase Agreement;

                (iv) charge Buyer for the recording cost of the Deed and 
          one-half of the closing fee and any escrow fees, and the cost of 
          any purchased title policy;

                (v) charge Seller for one-half of the closing fee and any 
          escrow fees, recording any documents clearing title to the 
          Property, any abstracting costs, and the cost of the title 
          insurance commitment for Buyer;

                (vi) charge Seller for the full cost of any deed transfer, 
          revenue or similar tax with respect to the sale of the Property;

                (vii) real estate taxes and installments of special 
          assessments due and payable in the year of closing shall be 
          prorated between the parties based on a calendar year and the date 
          of closing.  Seller shall pay all real estate taxes and 
          installments of special assessments due in the year prior to the 
          year of closing and earlier years including as provided in Section 
          IX(e) hereof; Buyer shall pay all real estate taxes and 
          installments of special assessments due and payable in the year 
          subsequent to the year of closing and subsequent years;

                (viii) all bills for services, labor, materials, capital 
          improvements or other charges of any kind or nature rendered to 
          Seller or the Property prior to the closing date shall be borne by 
          and paid by Seller;

                (ix) prepare closing statements for Seller and Buyer, 
          respectively, indicating deposits, credits and charges (including 
          allocation of current real property taxes) and deliver the same, 
          together with a disbursement of funds, to any appropriate party.

                (x) credit Buyer with any applicable security deposits and 
          prorate between the parties as of the date of closing all rents 
          and other amounts due under the Leases and operating expenses for 
          the Property.

     Any supplemental closing instructions given by any party shall also be 
followed by the Title Company provided the same do not conflict with any 
instructions set forth herein.


                                     SECTION XI
                                  DEFAULT BY BUYER

     In the event the transactions contemplated hereby fail to close as a result
of a material default by Buyer of any of the terms of this Purchase Agreement, 
and such failure to close continues for a period of five (5) days after Seller 
notifies Buyer of such event, Seller may, at its option, elect as its exclusive 
remedy one of the following:

          (a) To terminate this Purchase Agreement as provided for by law
     and retain the Deposit as provided in Section III hereof; or

          (b) To enforce specific performance of Buyer's obligations herein 
     to purchase the Property provided such action is commenced within one 
     hundred eighty (180) days from such failure to close.


                                  SECTION XII
                                DEFAULT BY SELLER

     If Seller refuses to perform any of its obligations as set forth herein or
is in material breach of any of its representations and warranties herein 
provided and such failure to perform or breach continues for a period of five 
(5) days after Buyer notifies Seller of such event, Buyer may, at its option, 
elect one of the following remedies:

          (a) To terminate this Purchase Agreement by notice to Seller, in
     which event neither party shall have any further rights or obligations 
     hereunder except that the Deposit exclusive of any interest thereon 
     shall be returned to Buyer as provided in Section III hereof; or

          (b) To enforce specific performance of Seller's obligations 
     hereunder, including specifically the conveyance of the Property in the 
     condition required hereby provided such action is commenced within one 
     hundred eighty (180) days from such failure to close.

Notwithstanding the foregoing, should Seller fail to terminate all leases (other
than the leases with the Five Tenants) prior to July 1, 2002 after having 
received Buyer's notice with the execution of this Purchase Agreement that 
Buyer agrees to close on July 1, 2002 and not before then, Buyer may terminate
this Purchase Agreement and upon such termination, Buyer shall be entitled to
receive one hundred percent (100%) of the Deposit plus accrued interest therein
as provided for in Section III(c) hereof.


                                     SECTION XIII
                                 EXPENSE OF ENFORCEMENT

     If either party brings an action at law or in equity to enforce or
interpret this Purchase Agreement, the prevailing party in such action shall be 
entitled to recover reasonable attorneys' fees and court costs in addition to 
any other remedy granted.


                                   SECTION XIV
                                     BROKERS

     Seller warrants to Buyer that in connection with this transaction Seller
has not taken any action which would result in any real estate broker's fee 
being due or payable to any party.  Buyer warrants to Seller that in connection 
with this transaction Buyer has not taken any action which would result in any 
real estate broker's fee, finder's fee or other fee being due or payable to any 
party.  Seller and Buyer respectively agree to indemnify, defend and hold 
harmless the other from and against any and all other claims, fees, commissions 
and suits of any real estate broker or agent with respect to services claimed to
have been rendered for or on behalf of such party in connection with the 
execution of this Purchase Agreement or the transaction set forth herein. 


                                    SECTION XV
                                       NOTICE

     All notices, demands and requests required or permitted to be given under
this Purchase Agreement must be in writing and shall be deemed to have been 
properly given or served either by personal delivery or by the expiration of
two (2) days after depositing the same in the United States mail, addressed
to Seller or to Buyer, as the case may be, prepaid and registered or certified
mail, return receipt requested, at the following addresses:

To Seller:      Hillcrest Development
                2424 Kennedy Street NE
                Minneapolis, Minnesota  55413
                Attention:  Scott M. Tankenoff
	
With Copy to:   Maun & Simon, PLC
                2000 Midwest Plaza Building West
                801 Nicollet Mall
                Minneapolis, Minnesota  55402
                Attention: Charles Bans

To Buyer:       R & D Systems, Inc.
                614 McKinley Place
                Minneapolis, MN 55413
                Attention:  Tom Oland, CEO

With Copy to:   Fredrikson & Byron, P.A.
                900 Second Ave. S
                Suite 1100
                Minneapolis, MN 55402
                Attention: Chuck Diessner


Rejection or refusal to accept or the inability to deliver notice hereunder 
because of changed address of which no notice was given shall be deemed to be
receipt of the notice, demand or request.  Any party shall have the right from
time to time and at any time upon at least ten (10) days' written notice 
thereof, to change their respective addresses, and each shall have the right 
to specify as its address any other address within the United States of 
America.


                                 SECTION XVI
                                 CONDEMNATION

     In the event any portion of the Property is condemned or access thereto
shall be taken, or in either case threatened, prior to the closing, and the 
taking renders the Property remaining unsuitable for the Buyer's anticipated use
of the Property and Buyer notifies Seller in writing that it wishes to terminate
this Purchase Agreement within thirty (30) days after written notice to Buyer of
such condemnation action, then this Purchase Agreement shall terminate, neither 
party to this Agreement shall have any further liability to the other (except 
for Buyer's indemnity in Sections IV(a) and V(A) hereof) and Buyer shall be 
entitled to a partial refund of the Deposit as described in Section III(b) 
hereof.

     If the Purchase Agreement is not terminated pursuant to the preceding
sentence, the Purchase Price of the Property shall not be affected, it being
agreed that if the award is paid prior to the closing of this transaction, such 
amount, insofar as it pertains to the Property, shall be held in escrow
and delivered to Buyer at the time of closing; and if the award has not been
paid prior to the closing of this transaction, then at the closing Seller
shall assign to Buyer all of its right, title and interest with respect to
such award and shall further execute any other instrument requested by Buyer
to assure that such award is paid to Buyer.  If Buyer fails to timely close
the transaction and this agreement is terminated by Seller, any escrowed
condemnation proceeds will be paid to Seller.

     If Buyer does not terminate this Purchase Agreement, it shall have the
right to contest the condemnation and/or the award resulting therefrom but such 
right shall terminate if Seller terminates this Purchase Agreement as a result 
of Buyer's default hereunder.  If this Purchase Agreement is not terminated, the
parties shall cooperate in defending any such taking and/or maximizing the 
amount of the award.  Neither party will take any action relating to the taking,
without the other party's written consent prior to closing.


                                   SECTION XVII
                         DAMAGE OCCURRING PRIOR TO CLOSING

     If, prior to the closing date, all or any part of the Property is
substantially damaged by fire, casualty, the elements or any other cause, Seller
shall immediately give notice to Buyer of such fact and at Buyer's option (to be
exercised with thirty (30) days after Seller's notice), this Purchase Agreement 
shall terminate, in which event neither party will have any further obligations 
under this Purchase Agreement (except for Buyer's indemnity under Sections IV(a)
and V(A) hereof) and Buyer shall be entitled to a partial refund of the Deposit 
as described in Section III(b) hereof.  If Buyer fails to elect to terminate 
despite such damage, Seller whether the damage is substantial or not to the 
extent reasonably possible shall promptly commence to repair such damage or 
destruction to the Property's prior condition and to mitigate further damages 
using the qualities of materials and workmanship existing prior to the date of 
the casualty.  If such damage shall be completely repaired prior to the closing 
date, then there shall be no reduction in the Purchase Price and Seller shall 
retain the proceeds of all insurance related to such damage.  If such damage 
shall not be completely repaired prior to the closing date at Buyer's election 
(i) Seller shall assign to Buyer all right to receive the proceeds of all 
insurance related to such damage, less costs incurred by Seller in mitigating 
damage or making repairs that are reimbursable by insurance then in force, and 
the Purchase Price shall remain the same or (ii) the closing shall be postponed
pending complete restoration of the damage by Seller.  For purposes of this 
Section, the words "substantially damaged" means damage that would cost 
$2,000,000.00 or more to repair.


                                  SECTION XVIII
                               INTENTIONALLY DELETED


                                     SECTION XIX
                                MERGER/BINDING AGREEMENT


     All previous negotiations and understandings between Seller and Buyer or
their respective agents and employees with respect to the transactions set forth
herein are merged in this Purchase Agreement which alone fully and completely 
express the parties' rights, duties and obligations.  This Purchase Agreement 
shall be binding upon and inure to the benefit of the parties hereto and their 
respective successors, assigns, heirs and personal representatives.


                                     SECTION XX
                                INTENTIONALLY DELETED


                                    SECTION XXI
                                    GOVERNING LAW

     This Purchase Agreement shall be deemed to be a contract made under the
laws of the State of Minnesota and for all purposes shall be governed and 
construed in accordance with the laws of said State.


                                    SECTION XXII
                                     ASSIGNMENT

     Buyer shall have the right to assign at closing its interest in this
Purchase Agreement, provided that the assignee also becomes personally 
responsible for Buyer's obligations herein.

     IN WITNESS WHEREOF, the parties hereto have executed these presents
intending to be bound by the provisions herein contained.

SELLER:                           BUYER:

Hillcrest Development             R & D Systems, Inc.


By:___________________________    By:____________________________
     Its:  General Partner           Its:						


                          ACKNOWLEDGMENT BY TITLE

    Title hereby agrees to act as escrow agent pursuant to the foregoing terms, 
it being understood that Title shall not be liable to either party if it acts in
good faith in the performance of its duties herein. 

                                First American Title Insurance Company


                                By:							
                                    Its:						


                                 EXHIBIT A


                             LEGAL DESCRIPTION


                                  EXHIBIT B


                           PERMITTED ENCUMBRANCES


(a)  Building and zoning laws, ordinances, state and federal regulations.

(b)  Reservation of any mineral or mineral rights to the State of Minnesota.

(c)  Real estate taxes and installments of special assessments due and payable
     in the year of closing and subsequent years.

(d)  All rights of existing tenants of the Property as provided in Section
     IX(v) of the Purchase Agreement.

(e)  All matters that would be disclosed by a survey.

(f)  Common driveway easement recorded as Document No. 1178824.

(g)  Parking easement dated _________________, 1999 between Seller, as 
     Grantor, and Buyer, as Grantee.

(h)  Covenants and restrictions contained in quitclaim deed dated 
     December 15, 1998 in favor of Seller relating to the MT-BN parking lot.

(i)  Possible rights of UCare Minnesota as a tenant or a future tenant of the 
     Property pursuant to a lease agreement originally covering a portion of 
     2001 Kennedy.

(j)  Sanitary sewer easement recorded as Document No. 1546011.

                                 
                                 EXHIBIT C


                             ENVIRONMENTAL REPORTS


                                  EXHIBIT D


                                   WARRANTS