PURCHASE AGREEMENT

    CHAMPPS AT 11075 INTERSTATE HWY 10 W., SAN ANTONIO, TEXAS


This AGREEMENT, entered into effective as of the 6 of August, 2007.

l.  PARTIES.  Seller  is  AEI Income & Growth  Fund  XXI  Limited
Partnership,  a  Minnesota  limited  partnership  which  owns  an
undivided  100%  interest in the fee title to that  certain  real
property  legally  described in the  attached  Exhibit  "A"  (the
"Property"), commonly known as 11075 Interstate Hwy  10  W.,  San
Antonio,  Texas.  Buyer  is  Champps  Operating  Corporation,   a
Minnesota  corporation, the parent of the current lessee  of  the
property, Champps Entertainment of Texas, Inc ("Lessee")  or  its
assigns.   Seller  wishes to sell and Buyer  wishes  to  buy  the
Property.

2.  PROPERTY. The Property to be sold to Buyer, or its  assignee,
in this transaction consists of an undivided 100% interest in the
Property.    Seller  owns  no  interest  in  any  personalty   in
connection with the Property.

3.  PURCHASE  PRICE.  The purchase price  for  this  Property  is
$3,150,100.00 all cash.

4.  TERMS.  The purchase price for the Property will be  paid  by
Buyer as follows:

    (a) When this agreement is executed, Buyer will pay $5,100.00 to
        Seller (which shall be deposited into escrow according to the
        terms hereof) (the "First Payment").  The First Payment will be
        credited against the purchase price when and if escrow closes and
        the sale is completed.  One Hundred Dollars of the First Payment
        shall be considered non-refundable, binding Option Consideration
        as required under Texas law.

    (b) Buyer  will deposit the balance of the purchase price,
        $3,145,000.00 (the Second Payment") into escrow in sufficient
        time to allow escrow to close on the closing date.

5.  CLOSING  DATE.   Escrow shall close on or before  August  30,
2007.  Without  limitation  of  any  other  provisions  contained
herein,  Buyer may extend the Closing date for up to two  30  day
periods  (not to exceed sixty (60) days by notice or  notices  to
the Seller) provided however, as a condition to being granted the
first thirty day extension, Buyer will be required to make a non-
refundable  deposit,  into escrow according to the terms  hereof,
in  the  amount of Five Thousand Dollars ($5,000.00), and   as  a
condition to being granted the second thirty day extension, Buyer
will  be  required to make an additional non-refundable  deposit,
into  escrow according to the terms hereof, in the amount of  Ten
Thousand Dollars ($10,000.00).

6.  DUE  DILIGENCE.  Buyer  or  Lessee  has  been  in  continuous
possession and control of the property since March 14, 1997,  and
as  such, has had ample opportunity to conduct such due diligence
on the Property as it deems appropriate.

     Buyer shall order at its own expense such title, survey, and
any   other  due  diligence  information  as  Buyer  shall   deem
necessary.   Buyer may only object to those matters of  title  or
survey  encumbering  the Property and caused  by  Seller  without
Buyer's or Lessee's knowledge and written consent.

7. ESCROW. Escrow shall be opened by Seller and the First Payment
deposited in escrow with  Heritage Title Company of Austin,  Inc,
401  Congress,  Suite  1500, Austin Texas 78701.  Attn:  John  P.
Bruce,  Senior  Vice President-Commercial Escrow (phone  512-505-
5012/fax:  512-380-8812)..  A copy  of  this  Agreement  will  be
delivered  to  the  escrow  holder  and  will  serve  as   escrow
instructions   together   with  the  escrow   holder's   standard
instructions  and  any additional instructions  required  by  the
escrow  holder to clarify its rights and duties. If there is  any
conflict  between  these other instructions and  this  Agreement,
this Agreement will control.

8.   CLOSING  COSTS.   Seller  shall  pay  no  closing  costs  in
connection  with the transaction contemplated herein, except  its
own  legal fees. Each party will pay its own attorney's fees  and
costs to document this transaction.

9.  REAL ESTATE TAXES, SPECIAL ASSESSMENTS AND PRORATIONS.

     (a)  Because the Property is subject to a triple net lease (as
       further set forth in paragraph 10(a)(i), the parties acknowledge
       that there shall be no need for a real estate tax proration.

     (b)  All income and all operating expenses including rent from
       the Property shall be prorated between the parties and adjusted
       by them as of the date of Closing.  Seller shall be entitled to
       all income earned prior to the date of Closing, Buyer shall be
       responsible for all operating expenses of the Property prior to
       Closing, and Buyer shall be entitled to all income earned and
       shall be responsible for all operating expenses of the Property
       incurred on and after the date of Closing.

     (c)  These provisions shall survive Closing.

10.  SELLER'S REPRESENTATION AND AGREEMENTS.

     (a)  Seller represents and warrants as of this date that:

     (i)  Except for the Lease Agreement dated March 14, 1997, in
          existence between Seller (as Lessor) and Champps Entertainment or
          Texas, Inc. (as Tenant or Lessee), (the "Lease"), Seller is not
          aware of any leases of the Property.

     (ii) It is not aware of any pending litigation or condemnation
          proceedings against the Property or Seller's interest in the
          Property.

     (iii)  Except  as previously disclosed to Buyer  and  as
          permitted in paragraph (b) below, Seller is not aware of any
          contracts Seller has executed that would be binding on Buyer
          after the closing date.

     (iv) Seller is not now, nor at the Closing shall Seller be, a non-
          resident alien or a foreign person, corporation, partnership,
          trust, estate or entity, in each case within the purview of
          Section 1445 of the Internal Revenue Code.  Seller agrees to
          comply with Section 1445 of the Internal Revenue Code and at the
          Closing will complete and submit to Buyer such instruments in
          connection therewith as Buyer and/or the Title Company may
          require.

     (v)  Seller has all requisite power and authority to consummate
          the transaction contemplated by this Agreement and has by proper
          proceedings duly authorized the execution and delivery of this
          Agreement and  the consummation of the transaction contemplated
          hereby.

     (vi) In  addition to the acts and deeds recited  herein  and
          contemplated to be performed, executed, and delivered by Seller,
          Seller shall perform, execute and deliver or cause to be
          performed, executed, and delivered at the Closing or after the
          Closing, any and all further acts, deeds and assurances as Buyer
          or the Title Company may require and be reasonable in order to
          consummate the transactions contemplated herein.

     (vii)      To Seller's knowledge, neither the execution  and
     delivery of this Agreement nor     the consummation  of  the
     transaction  contemplated  hereby  will  violate  or  be  in
     conflict with (a) any applicable provisions of law, (b)  any
     order  of any court or    other agency of government  having
     jurisdiction hereof, or (c) any agreement or      instrument
     to which Seller is a party or by which Seller is bound.


     (b)   Provided  that  Buyer performs  its  obligations  when
     required, Seller agrees that it will not enter into any  new
     contracts that would materially affect the Property  and  be
     binding  on  Buyer  after the Closing Date  without  Buyer's
     prior consent, which will not be unreasonably withheld.

11.  DISCLOSURES.

     (a)   Seller  has not received any notice of  any  material,
     physical,  or mechanical defects of the Property,  including
     without limitation, the plumbing, heating, air conditioning,
     ventilating, and electrical systems. To the best of Seller's
     knowledge  without  inquiry, all  such  items  are  in  good
     operating  condition and repair and in compliance  with  all
     applicable   governmental,  zoning,  and  land   use   laws,
     ordinances,  regulations and requirements.  If Seller  shall
     receive any notice to the contrary prior to Closing,  Seller
     will inform Buyer prior to Closing.

     (b)   Seller  has not received any notice that the  use  and
     operation  of  the Property is not in full  compliance  with
     applicable  building codes, safety, fire, zoning,  and  land
     use  laws,  and  other applicable local, state  and  federal
     laws,  ordinances, regulations and requirements.  If  Seller
     shall  receive any notice to the contrary prior to  Closing,
     Seller will inform Buyer prior to Closing.

     (c)   Seller  knows  of no facts nor has  Seller  failed  to
     disclose  to  Buyer  any fact known to  Seller  which  would
     prevent  the  Tenant from using and operating  the  Property
     after  the  Closing in the manner in which the Property  has
     been  used and operated prior to the date of this Agreement.
     If  Seller shall receive any notice to the contrary prior to
     Closing, Seller will inform Buyer prior to Closing.

     (d)    Seller has not received any notice that the  Property
     is  in  violation  of  any  federal,  state  or  local  law,
     ordinance, or regulations relating to industrial hygiene  or
     the   environmental  conditions  on,  under,  or  about  the
     Property,   including,  but  not  limited  to,   soil,   and
     groundwater conditions.  To the best of Seller's  knowledge,
     there  is  no  proceeding  or inquiry  by  any  governmental
     authority   with  respect  to  the  presence  of   Hazardous
     Materials  on  the  Property or the migration  of  Hazardous
     Materials  from  or  to  other property.   To  the  best  of
     Seller's  knowledge, without inquiry: the Property  is  not,
     and at the time of the Closing shall not have been, used for
     the  generation,  storage,  transport  or  disposal  of,  or
     contaminated  or threatened with contamination from  outside
     sources  by,  any oil, hazardous waste (as  defined  in  the
     Resource  Conversation  and Recovery  Act,  as  amended,  42
     U.S.C.  Section  6291  et  seq.), hazardous  substances  (as
     defined   in   the  Comprehensive  Environmental   Response,
     Compensation  and  Liability  Act,  as  amended,  42  U.S.C.
     Section 9601 et seq.), or hazardous materials (as defined in
     the Hazardous Material Transportation Act, 49 U.S.C. Section
     1801  et.  seq.) (or as any of the foregoing are defined  in
     any  other federal law, in any applicable state or local law
     or  in  any  regulations  adopted pursuant  to  any  of  the
     foregoing  statutes  or other laws), and  the  Property  has
     never been used as, nor at the time of the Closing shall the
     Property  ever have been used as, a land fill or dump  site.
     Buyer agrees that Seller will have no liability of any  type
     to  Buyer  or Buyer's successors, assigns, or affiliates  in
     connection  with any Hazardous Materials on or in connection
     with  the Property either before or after the Closing  Date,
     except such Hazardous Materials on or in connection with the
     Property  arising  out  of  Seller's  gross  negligence   or
     intentional misconduct.  If Seller shall receive any  notice
     to  the contrary prior to Closing, Seller will inform  Buyer
     prior to Closing.

     (e)   Buyer agrees that it shall be purchasing the  Property
     in  its  then present condition, as is, where is, and Seller
     has  no  obligations to construct or repair any improvements
     thereon  or to perform any other act regarding the Property,
     except as expressly provided herein or as caused by Seller's
     gross negligence or intentional misconduct.

     (f)   Buyer  acknowledges that, its wholly owned subsidiary,
     Lessee,  having been in possession of the Property and  such
     financial  information on the Lessee and Guarantors  of  the
     Lease  as  Buyer  or  its advisors shall require,  Buyer  is
     relying solely on its own investigation of the Property  and
     not  on any information provided by Seller or to be provided
     except as set forth herein.  Buyer further acknowledges that
     the  information,  if  any, to be provided  by  Seller  with
     respect  to  the  Property,  to  the  Lessee,  and  to   the
     Guarantors of Lease, was obtained from a variety of  sources
     and Seller neither (a) has made independent investigation or
     verification   of  such  information,  or  (b)   makes   any
     representations as to the accuracy or completeness  of  such
     information  except as herein set forth.  The  sale  of  the
     Property as provided for herein is made on an "AS IS" basis,
     and  Buyer expressly acknowledges that, in consideration  of
     the   agreements  of  Seller  herein,  except  as  otherwise
     specified herein in paragraph 11(a) and (b) above  and  this
     paragraph  12,  Seller makes no Warranty or  representation,
     Express  or  Implied,  or  arising  by  operation  of   law,
     including,  but not limited to, any warranty  of  condition,
     habitability,  tenantability,  suitability  for   commercial
     purposes,  merchantability,  or  fitness  for  a  particular
     purpose, in respect of the Property.

     The  provisions of (a)-(c) above shall survive  the  closing
     for  a  period of six (6) months. The provisions (d)  -  (f)
     above shall survive Closing.

12.  CLOSING.

     (a)  Before the closing date, Seller will deposit into escrow an
       executed special warranty deed warranting title against lawful
       claims by, through, or under a conveyance from Seller, but not
       further or otherwise, conveying insurable title of the Property
       to Buyer, or its assignee, subject to all exceptions of record
       except those encumbering the Property and caused by Seller
       without Buyer's or Lessee's knowledge and written consent.  On or
       before the closing date, Seller shall also deposit into escrow
       and executed Assignment of Lease assigning all of  Seller's
       rights, title and interest in the Lease as Landlord to the Buyer,
       and the written consent of Lessee and waiver of Lessee's Right of
       First Refusal as set forth in the Lease.

     (b)   On or before the closing date, Buyer will deposit into
       escrow: the balance of the Purchase Price when required under
       Section 4; any additional funds required of Buyer (pursuant to
       this agreement or any other agreement executed by Buyer) to close
       escrow.  Both parties will deliver to the escrow holder any other
       documents reasonably required by the escrow holder to close
       escrow.

     (c)  On the closing date, if escrow is in a position to close,
       the escrow holder will: record the deed in the official records
       of the county where the Property is located; cause the title
       company to commit to issue the title policy; immediately deliver
       to Seller the portion of the purchase price deposited into escrow
       by cashier's check or wire transfer (less debits and prorations,
       if any); deliver to Seller and Buyer a signed counterpart of the
       escrow holder's certified closing statement and take all other
       actions necessary to close escrow.

13.   DEFAULTS.  If Buyer defaults, Buyer will forfeit all rights
and  claims  and  Seller will be relieved of all obligations  and
will  be  entitled to retain all monies heretofore  paid  by  the
Buyer. In addition, Seller shall retain all remedies available to
Seller at law or in equity.  Provided, however, that in no  event
shall  Buyer  be  liable  for  any,  punitive,  consequential  or
speculative  damages  arising  out  of  any  default   by   Buyer
hereunder.

      If  Seller  shall  default, Buyer may, at  its  option,  in
addition  to  any other remedies provided herein,  (1)  terminate
this  agreement and recover all earnest money and  other  amounts
paid  hereunder, together with all expenses paid or  incurred  by
Buyer (including reasonable attorneys' fees) in contemplation  of
Seller's  performance  hereunder, in which event  this  agreement
will be null and void and without recourse to any party in law or
in  equity,  (2)  proceed with this agreement  and  purchase  the
Property   subject  to  an  abatement  in  the   Purchase   Price
satisfactory  to the parties, or (3) pursue any  other  legal  or
equitable   remedy,   including  without   limitation,   specific
performance.  Provided, however, that in no event shall Seller be
liable  for  any, punitive, consequential or speculative  damages
arising out of any default by Seller hereunder.

14.  BUYER'S REPRESENTATIONS AND WARRANTIES.

     a.  Buyer represents and warrants to Seller as follows:

     (i)   In  addition to the acts and deeds recited herein  and
     contemplated  to  be performed, executed, and  delivered  by
     Buyer, Buyer shall perform, execute and deliver or cause  to
     be  performed,  executed, and delivered at  the  Closing  or
     after  the  Closing,  any and all further  acts,  deeds  and
     assurances as Seller or the Title Company may require and be
     reasonable   in   order  to  consummate   the   transactions
     contemplated herein.

     (ii)   Buyer  has  all  requisite  power  and  authority  to
     consummate  the  transaction contemplated by this  Agreement
     and  has by proper proceedings duly authorized the execution
     and  delivery of this Agreement and the consummation of  the
     transaction contemplated hereby.

     (iii)   To  Buyer's  knowledge, neither  the  execution  and
     delivery  of  this  Agreement nor the  consummation  of  the
     transaction  contemplated  hereby  will  violate  or  be  in
     conflict with (a) any applicable provisions of law, (b)  any
     order  of  any  court or other agency of  government  having
     jurisdiction  hereof, or (c) any agreement or instrument  to
     which Buyer is a party or by which Buyer is bound.

15.  MISCELLANEOUS.

     (a)  This Agreement may be amended only by written agreement
     signed by both Seller and Buyer, and all waivers must be  in
     writing  and signed by the waiving party.  Time  is  of  the
     essence.   This  Agreement  will not  be  construed  for  or
     against  a party whether or not that party has drafted  this
     Agreement.  If there is any action or proceeding between the
     parties relating to this Agreement the prevailing party will
     be  entitled to recover attorney's fees and costs.  This  is
     an  integrated  agreement containing all agreements  of  the
     parties  about the Property and the other matters described,
     and  it  supersedes any other agreements or  understandings.
     Exhibits  attached  to this Agreement are incorporated  into
     this Agreement.

     (b)   If  this escrow has not closed by September  30,  2007
     through  no  fault  of Seller, Seller  may  either,  at  its
     election,  extend  the closing date or exercise  any  remedy
     available   to   it  by  law,  including  terminating   this
     Agreement.

     (c)  Funds to be deposited or paid by Buyer must be good and
     clear  funds in the form of cash, cashier's checks  or  wire
     transfers.

     (d)   All notices from either of the parties hereto  to  the
     other  shall be in writing and shall be considered  to  have
     been  duly  given or served if sent by first class certified
     mail,  return receipt requested, postage prepaid,  or  by  a
     nationally recognized courier service guaranteeing overnight
     delivery to the party at his or its address set forth below,
     or  to  such  other  address  as such  party  may  hereafter
     designate by written notice to the other party.

     If to Seller:

          AEI Fund Management XXI, Inc.
          Attention:  Robert P. Johnson and George Rerat
          1300 Wells Fargo Place
          30 East Seventh Street
          St. Paul, MN 55101


     If to Buyer:

          Champps Operating Corporation
          Attention:  Dave Womack and Donna Depoian
          10375 Park Meadows Drive, Suite 560
          Littleton, Colorado  80124-64791

      When  accepted, this offer will be a binding agreement  for
valid  and  sufficient consideration which will bind and  benefit
Buyer, Seller and their respective successors and assigns.  Buyer
is  submitting  this offer by signing a copy of  this  offer  and
delivering it to Seller.  Seller has five (5) business days  from
receipt within which to accept this offer.

      This  Agreement  shall be governed by, and  interpreted  in
accordance with, the laws of the state of Texas.


      IN WITNESS WHEREOF, the Seller and Buyer have executed this
Agreement effective as of the day and year above first written.


BUYER:    Champps Operating Corporation

          By: /s/ Dave Womack
          Its: CFO





SELLER:   AEI INCOME & GROWTH FUND XXI LIMITED PARTNERSHIP, a
          Minnesota limited partnership
          By:  AEI Fund Management XXI, Inc. , a Minnesota
               corporation

          By: /s/ Robert P Johnson
                  Robert P. Johnson, its President



      (THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK)




                            Exhibit A

Lot 14, Block 1, New City Block 16841, Huebner Oaks Commons Unit-
   2,  in  the City of San Antonio, Texas, according to the  plat
   thereof recorded in Volume 9534, Pages 204-205, Deed and  Plat
   Records of Bexar County, Texas;.



                  LEGAL DESCRIPTION OF PROPERTY


A 1.545 acre (67,300 square feet) tract of land, being out of the
B.B.B. and C.R.R. Survey No. 400, Abstract 99, County Block 4767,
consisting of Lot 14, Block 1, New City Block 16841, Huebner Oaks
Commons Unit 2, in the City of San Antonio, Bexar County, Texas
according to the plat thereof recorded in Volume 9534, Page 204
and 205 of the Deed and Plat Records of Bexar County, Texas, and
being more particularly described by metes and bounds as follows:

COMMENCING:    At  a  found 1/2" iron rod with yellow cap  marked
               "Pape-Dawson,"  said  point  being  the  southwest
               corner  of Lot 12, Block 1, New City Block  16841,
               Huebner Oaks Commons Unit 2 as recorded in  Volume
               9534,  Page 204 and 205, said point also being  on
               the east right-of-way of interstate Highway 10, an
               expressway with a variable width right-of-way.

THENCE:        N  54  28  52  W, along said east right-of-way  of
               Interstate  Highway 10, a distance of 66.48  feet,
               to  a  found 1/2" iron rod with yellow cap  marked
               "Pape-Dawson," for the POINT OF BEGINNING and  the
               south corner of this tract:

THENCE:        N 54 28 52 W, a distance of 150.34 feet along said
               east  right-of-way line of Interstate Highway  10,
               to  a  found 1/2" iron rod with yellow cap  marked
               "Pape-Dawson,"  for the point of  curvature  of  a
               curve to the right.

THENCE:        Continuing along said Interstate Highway  10  with
               said curve to the right having a radius of 2748.75
               feet, a central angle of 02 02 15, a chord bearing
               and distance of N 53 23 14 W, 100.15 feet, and  an
               arc length of 100.15 feet in a found 1/2" iron rod
               with  yellow  cap  marked "Pape-Dawson,"  for  the
               north  west corner of this tract, said point  also
               being  the south corner of Lot 13, as recorded  in
               the aforementioned Huebner Oaks Commons Unit 2.

THENCE:        N  43  40  21  E, departing said east right-of-way
               line  of  Interstate Highway 10, along the  common
               property line of Lot 13 and this tract, a distance
               of  426.65   feet to a found 1/2"  iron  rod  with
               yellow  cap  marked "Pape-Dawson," for  the  north
               corner of this tract, said point also being on the
               southwest  property line of Lot 12 as recorded  in
               the aforementioned Huebner Oaks Commons Unit 2.

THENCE:        S  45  51 53 E, departing said common line of Lots
               13  and 14, along the common property line of  Lot
               12  and this tract a distance of 73.50 feet, to  a
               found  1/2" iron rod with yellow cap marked "Pape-
               Dawson,".

THENCE:        S  43 40 21 W, along said common property line,  a
               distance  of 159.42 feet to a found 1/2" iron  rod
               with  yellow  cap  marked  "Pape-Dawson"  for   an
               interior  corner of this tract and a southwesterly
               corner of said Lot 12;

THENCE:        S  45  50  51  E,  continuing along  said  commons
               property  line,  a distance of 139.26  feet  to  a
               found  1/2" iron rod with yellow cap marked "Pape-
               Dawson," for the east corner of this tract and  an
               interior southwesterly corner of said Lot 12,  and
               point  of curvature of a non-tangent curve to  the
               left;

THENCE:        With  said  curve  to  the left  having  a  radial
               bearing of S 40 14 09 E, a radius of 459.29  feet,
               central  angle  of 29 34 26, a chord  bearing  and
               istance  of S 34 58 38 W, 234.45 feet and  an  arc
               length  of  237.07 feet to the POINT OF  BEGINNING
               and containing 1.545 acres of land in the City  of
               San Antonio, Bexar County, Texas