PHASE II OPTION AGREEMENT
                          (2001 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 a purchaser under a purchase agreement dated August 14,
1998 ("Phase II Purchase Agreement") to purchase the fee simple title to the 
real property improved with a building commonly known as 2001 Kennedy and is the
current fee simple owner of real property to be used for a surface parking lot 
commonly known as the "2020 Broadway 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 ("Parcels"); and

     WHEREAS, Buyer and Seller 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 simultaneously with the execution of
this Option Agreement entered into an additional option agreement with respect 
to 2101 Kennedy and 659 Cleveland and certain real property to be used for 
parking purposes ("2101 Kennedy 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 Thousand and no/100 Dollars
($1,000.00) 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
December 1, 1999 and ending at 11:59 o'clock p.m., on January 1, 2005 (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) prior to the earlier of (x) January 15, 2002
or (y) sixty (60) days after the date Buyer exercises its option under the 2101 
Kennedy Option, the Option Fee, as hereafter defined, is paid to Title, as 
defined in the Purchase Agreement attached hereto as Exhibit B ("Exhibit B 
Purchase Agreement"), as Escrow Agent for both parties; 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 Title shall automatically terminate the option herein granted to 
Buyer and Title shall remit 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, the parties shall execute the Exhibit B 
Purchase Agreement.  The Option Fee shall consist of nonrefundable cash except 
as hereinafter provided, in the amount of $1,999,000.00.  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 in the event (i) Buyer or Techne Corporation has not yet acquired
from Owner the real property covered by the Purchase Agreement, (ii) in the
event Buyer or Techne Corporation fails to pay Owner the Option Fee and/or
fails to close its purchase of 2101 Kennedy pursuant to the 2101 Kennedy
Option prior to the actual exercise of the option herein granted to Buyer, or
(iii) if Owner fails to acquire fee simple title to 2001 Kennedy pursuant to
the Phase II Purchase Agreement by November 30, 1999.  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.  Notwithstanding
the foregoing or any other provision of this Option Agreement, if Buyer
terminates its rights to purchase 2101 Kennedy pursuant to Exhibit B to the
2101 Kennedy Option and is entitled to a refund of one hundred percent (100%)
of the Deposit pursuant to Section III(c) therein, then in such event Title
shall return to Buyer the Option Fee paid hereunder and this Option Agreement
shall be deemed null and void except for the indemnification of Buyer
contained in paragraph 5 of this Option Agreement.

     3. Purchase Price.  The purchase price for the Property shall be Seven
Million and 00/100ths Dollars ($7,000,000.00) payable in cash to Owner at the 
closing plus the "Capital Improvement Cost" as defined in the Exhibit B Purchase
Agreement.  Buyer shall receive at closing as a credit against the purchase 
price for the Option Fee and the $1,000.00 previously paid.  The purchase price 
shall be allocated between the following portions of the Property upon execution
of the Exhibit B Purchase Agreement:  $___________________ to 2001 Kennedy and 
$________________ to 2020 Broadway 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 any additional liens or 
         encumbrances against the Property until the Memorandum, as hereafter 
         defined, is placed of record provided that such Memorandum is 
         recorded within thirty (30) days of its date of execution.

     (b) To the extent commercially reasonable after any condemnation and/or
         casualty, Owner will upon its acquisition of Title to the Property 
         operate, maintain and repair the Property in a commercially 
         reasonable fashion.

     (c) Upon Owner's acquisition of Title to the Property, Owner will
         maintain casualty insurance for at least $9,000,000.00 on the 2001 
         Kennedy 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) Upon Owner's acquisition of Title to the Property, Owner will not
         thereafter knowingly lease the Property to tenants who engage in the 
         business of the generation and/or storage of hazardous materials but 
         the foregoing shall 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) Upon Owner's acquisition of title to the Property, 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 materially 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
         upon Owner's acquisition of title to the Property 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 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 a 
         fuel oil tank located at the south end of 2001 Kennedy, 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 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 Exhibit C 
         and Exhibit D of the Purchase Agreement, except for acts of Buyer as 
         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 a fuel oil tank located at the south end of
         2001 Kennedy, 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 Materials.  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.

     (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 the easterly portion of Arthur Street and the proposed 
         vacation of part of Summer Street and the 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) Upon Owner's acquisition of title to the Property, 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 
         renovations the violation becomes moot.

     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.  After Owner has acquired fee 
title to the Property but prior to Buyer's exercise of its options herein 
granted 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.  Owner agrees to give Buyer
written notice of such acquisition date within three (3) business days of such 
acquisition.  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.  Leases.  During the term of this Option Agreement, Owner, subject
to Buyer's rights hereafter set forth, shall be free to execute leases with
third party tenant(s) for a term or period to expire no later than
(i) December 31, 2011 with respect to space on the first and/or lower level
located north of column 8 as shown on Exhibit D hereto attached; and (ii) July
1, 2005 with respect to space on the first and/or lower level located south of
column 8 as shown on Exhibit D hereto attached.  Owner shall not lease any of
the Property to tenants whose primary business involves the storing and/or
manufacturing 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.  Before Owner enters into any third party
leases, including leases falling within subparagraphs (i) and (ii), Owner
shall submit in writing to Buyer written notice of a proposal of the terms and
conditions of the proposed third party lease in outline form containing
length of lease, rent, estimated operating expenses, scope and responsibility
for payment of Tenant Improvements and any tenant inducements.  Owner agrees
not to enter into such third party lease if within three (3) business days
after receipt of the proposal the Buyer either:

     (a) Exercise its purchase option at that time; or

     (b) Agrees in writing to enter into a lease of the space from Owner under
         the same basic terms and conditions as the Third Party.

If Buyer fails to exercise its rights in subparagraphs (a) or (b) above, Owner
may enter into such third party lease containing substantially similar terms as 
set forth in the proposal.  Notwithstanding the foregoing, this entire paragraph
7 shall not apply to a lease with UCare Minnesota which is consented to by 
Buyer.

     8.  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.

     9.  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.

     10. Recording.  The parties agree to execute at the closing of the
Purchase Agreement a recordable memorandum of Option Agreement in the form of 
Exhibit E hereto attached ("Memorandum") for purposes of memorializing of record
this Agreement.  Buyer shall deposit in escrow with Title a quitclaim deed to 
the Property 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.

     11. Condemnation.  If any portion of the Property but not the whole 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/or to the extent required by any applicable 
leases and the balance, if any, be 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 any cash portion of the Option Fee previously paid by Buyer to 
Owner shall be refunded to Buyer.

     12. Casualty.  If any "major" damage to the 2001 Kennedy Building occurs
prior to the exercise of the option granted herein, Buyer shall elect within ten
(10) 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 Purchase Price over one-half of the Option Fee.  If any
"minor" damage to the 2001 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 Option Fee.

     For purposes of this paragraph, a "major" damage is defined as damage more
than twenty-five percent (25%) of the value of the 2001 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.

     13. Proposed Vacation of Summer Street and Arthur Street.  It is
contemplated by the parties that part of Summer Street lying between 2001 
Kennedy and 2020 Broadway parking lot and the easterly portion of Arthur Street 
between Summer and Kennedy Streets, will be vacated by Owner and the parties 
agree that upon such vacation that all of such vacated street shall accrue to 
2001 Kennedy and the parties shall 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
                          (2001 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 the real property ("Land") improved
with a building ("Building") commonly known as 2001 Kennedy and is the current 
fee simple owner of real property ("Parking Land") to be used for surface 
parking lot commonly known as the "2020 Broadway 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 Building, 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 and 00/100 Dollars ($7,000,000.00) plus Capital Improvement Cost 
identified in Section VIII hereof (the "Purchase Price"), which shall be paid by
Buyer to Seller as follows:

     (i) $1,999,000.00 has already been paid into escrow as provided for in
     Section II below.

     (ii) The remainder of the Purchase Price will be payable at closing in 
     immediately available funds.

     The Purchase Price shall be allocated as follows:
     $_________________ to 2001 Kennedy;
     $_________________ to Parking Land.


                                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 
$1,999,000.00, (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, 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 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 Building 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 it 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, 2005.  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 as described in Sections III(b) or III(c) hereof.  Notwithstanding the 
foregoing, Buyer may elect to terminate this Purchase Agreement between 
January 15, 2005 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, 2005, or (ii) a change in any item referred to
in (b) above occurs between January 15, 2005 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, 2005 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, 2005 for the discovery of such 
materials prior thereto or (ii) the closing date for the discovery of such 
materials after January 15, 2005 and prior to the closing date and upon such 
termination Buyer shall be entitled to a partial or full refund as described 
in Section 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 thirty (30)
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, but no later than the closing date, as hereafter defined, 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 disclosed 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 
Section IV(a) or 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 $1,999,000.00 in the event of any such 
exchange(s) shall be allocated to 2001 Kennedy.


                                SECTION VIII
                           ADDITIONAL PURCHASE PRICE

  As additional Purchase Price, Buyer shall pay the amount as hereafter set
forth of Seller's expenditures for capital improvements on the Property made 
after June 1, 1999 together with up to a ten percent (10%) fee for Seller's 
profit and overhead if Seller or its affiliates is the general contractor 
("Capital Improvement Cost") provided that such capital expenditures are for 
the improvements described in Exhibit D hereto attached.  Any such capital 
improvement shall be amortized over two hundred four (204) months at the 
lowest Applicable Federal Interest Rates (AFR) as published as of the 
completion date of the improvement by the Internal Revenue Service commencing
as of the date the improvement has been completed.  The Capital Improvement 
Cost for each such capital improvement shall be equal to the monthly amortized
amount multiplied by a number equal to 204 less the number of months 
(including fractions thereof) between the completion date of such improvement
and the closing hereof.


                               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 a 
     fuel oil tank located at the south end of 2001 Kennedy, 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 material for the Property and except for a 
     fuel oil tank located at the south end of 2001 Kennedy, 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 Materials.  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 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, 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 Summer Street, Cleveland Street and Arthur 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 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 has not leased the Property to tenants in violation of 
     paragraph 7 of the Option Agreement.

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

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

          (u)  To the extent commercially reasonable after any 
     condemnation and/or casualty, Seller will upon its acquisition of 
     Title to the Property operate, maintain and repair the Property in a 
     commercially reasonable fashion.

          (v)  Upon Seller's acquisition of Title to the Property, Seller 
     will maintain casualty insurance for at least $9,000,000.00 on the 
     2001 Kennedy 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.

          (w)  Upon Seller's acquisition of Title to the Property, Seller 
     will not thereafter knowingly lease the Property to tenants who 
     engage in the business of the 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 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.

     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 representations and warranties will survive until December 31, 
     2005 ("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, 2005, 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) any applicable abstracts of title in Seller's 
          possession;

               (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 Purchase Price, including the 
          Additional Purchase Price as provided for in Section VIII in cash, 
          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.


                                  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
                         VACATION OF SUMMER STREET

     If at the date of execution of this Purchase Agreement that part of Summer
Street lying between 2001 Kennedy and 2020 Broadway parking lot and the easterly
portion of Arthur Street lying between Kennedy Street and Summer Street has 
been or is in the process of being vacated, it is agreed that all of such 
vacated street shall accrue to 2001 Kennedy and the parties shall 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 any 
vacated street which the City may attempt to impose.


                               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 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: President                    



                         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 leased pursuant to
        paragraph 7 of the Option.

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

(f)	Sanitary sewer easement to County of Hennepin recorded as Document No.
        1546011.

(g)	Declaration of restrictions regarding use of real property where 
        response actions have been taken pursuant to Minnesota Statutes Sections
        115B.01 to 115B.18 recorded as Document No. 2489354.

(h)	Affidavit concerning real property contaminated with hazardous 
        substances recorded as Document No. 2489355.



                                EXHIBIT C


                        LIST ENVIRONMENTAL REPORTS


                                EXHIBIT D


                            CAPITAL IMPROVEMENTS