PURCHASE AGREEMENT
               Arby's Restaurant - Montgomery, AL

This  AGREEMENT, entered into effective as of the 20th  of  July,
1999.

l.  PARTIES.  Seller  is  AEI Income & Growth  Fund  XXI  Limited
Partnership which owns an undivided 87.7193% interest in the  fee
title  to  that  certain real property legally described  in  the
attached  Exhibit  "A"  (the "Entire  Property")   Buyer  is  The
Catharine C. Whittenburg Testamentary Trust for J. A. Whittenburg
IV  or  Assigns ("Buyer"). Seller wishes to sell and Buyer wishes
to  buy a portion as Tenant in Common of Seller's interest in the
Entire Property.

2. PROPERTY. The Property to be sold to Buyer in this transaction
consists    of   an   undivided   21.5614   percentage   interest
(hereinafter, simply the "Property") as Tenant in Common  in  the
Entire Property.

3.  PURCHASE  PRICE  .  The purchase price  for  this  percentage
interest in the Entire Property is $250,000, 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  $5,000
     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.

     (b)  Buyer  will deposit the balance of the purchase  price,
     $245,000  (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 2, 1999.

6.  DUE  DILIGENCE. Buyer will have until the expiration  of  the
tenth  business day (The "Review Period") after delivery of  each
of  following items, to be supplied by Seller, to conduct all  of
its  inspections  and due diligence and satisfy itself  regarding
each  item, the Property, and this transaction.  Buyer agrees  to
indemnify and hold Seller harmless for any loss or damage to  the
Entire  Property or persons caused by Buyer or its agents arising
out of such physical inspections of the Entire Property.

     (a)   The  original  and  one  copy  of  a  title  insurance
     commitment  for  an  Owner's  Title  insurance  policy  (see
     paragraph 8 below).

     (b)  A  copy  of  a Certificate of Occupancy or  other  such
     document  certifying completion and granting  permission  to
     permanently  occupy the improvements on the Entire  Property
     as are in Seller's possession.

     (c)  A  copy of an "as built" survey of the Entire  Property
     done concurrent with Seller's acquisition of the Property.

     (d) Lease (as further set forth in paragraph 11(a) below) of
     the Entire Property showing occupancy date, lease expiration
     date,  rent,  and  Guarantys, if any,  accompanied  by  such
     tenant  financial statements as may have been provided  most
     recently to Seller by the Tenant and/or Guarantors.



     Buyer Initial: /s/ DEB /s/ JFT  /s/ JAW IV
     Purchase Agreement for Arby's Restaurant-Montgomery, AL


     It is a contingency upon Seller's obligations hereunder that
two  (2)  copies  of  Co-Tenancy Agreement in the  form  attached
hereto  duly  executed by Buyer and Seller and  dated  on  escrow
closing date be delivered to the Seller on the closing date.

      Buyer may cancel this agreement for ANY REASON in its  sole
discretion  by delivering a cancellation notice, via first  class
mail,  return  receipt  requested, to Seller  and  escrow  holder
before the expiration of the Review Period. Such notice shall  be
deemed  effective only upon receipt by Seller.  If this Agreement
is  not cancelled as set forth above, the First Payment shall  be
non-refundable unless Seller shall default hereunder.

      If  Buyer  cancels this Agreement as permitted  under  this
Section,  except  for  any  escrow  cancellation  fees  and   any
liabilities  under  the first paragraph of  sections  6  of  this
agreement  (which will survive), Buyer (after execution  of  such
documents   reasonably  requested  by  Seller  to  evidence   the
termination  hereof)  shall be returned its  First  Payment,  and
Buyer  will have absolutely no rights, claims or interest of  any
type  in  connection  with  the  Property  or  this  transaction,
regardless of any alleged conduct by Seller or anyone else.

      Unless this Agreement is canceled by Buyer pursuant to  the
terms  hereof, if Buyer fails to make the Second Payment,  Seller
shall   be  entitled  to  retain  the  First  Payment  and  Buyer
irrevocably will be deemed to be in default under this Agreement.
Seller  may, at its option, retain the First Payment and  declare
this Agreement null and void, in which event Buyer will be deemed
to  have canceled this Agreement and relinquish all rights in and
to  the  Property or Seller may exercise its rights under Section
14  hereof.   If  this Agreement is not canceled and  the  Second
Payment  is  made  when required, all of Buyer's  conditions  and
contingencies will be deemed satisfied.

7.  ESCROW. Escrow shall be opened by Seller and funds  deposited
in  escrow upon acceptance of this agreement by both parties. The
escrow  holder  will  be a nationally-recognized  escrow  company
selected by Seller. 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  (and  the  parties agree to  sign  these  additional
instructions).  If  there  is any conflict  between  these  other
instructions and this Agreement, this Agreement will control.

8.   TITLE.  Closing will be conditioned on the commitment  of  a
title  company selected by Seller to issue an Owner's  policy  of
title  insurance, dated as of the close of escrow, in  an  amount
equal  to  the  purchase  price, insuring  that  Buyer  will  own
insurable  title  to  the Property subject  only  to:  the  title
company's  standard exceptions;  current real property taxes  and
assessments;  survey  exceptions;  the  rights  of   parties   in
possession pursuant to the lease defined in paragraph  11  below;
and  other  items of record disclosed to Buyer during the  Review
Period.

      Buyer shall be allowed ten (10) days after receipt of  said
commitment  for examination and the making of any  objections  to
marketability thereto, said objections to be made in  writing  or
deemed  waived.  If any objections are so made, the Seller  shall
be  allowed eighty (80) days to make such title marketable or  in
the  alternative  to  obtain  a commitment  for  insurable  title
insuring over Buyer's objections.  If Seller shall decide to make
no  efforts to make title marketable, or is unable to make  title
marketable or obtain insurable title, (after execution  by  Buyer
of  such documents reasonably requested by Seller to evidence the
termination  hereof) Buyer's First Payment shall be returned  and
this Agreement shall be null and void and of no further force and
effect.  Seller has no obligation to spend any funds or make  any
effort to satisfy Buyer's objections if any.

      Pending  satisfaction of Buyer's objections,  the  payments
hereunder  required shall be postponed, but upon satisfaction  of
Buyer's objections and within ten (10) days after written


     Buyer Initial: /s/ DEB /s/ JFT  /s/ JAW IV
     Purchase Agreement for Arby's Restaurant-Montgomery, AL




notice  of  satisfaction of Buyer's objections to the Buyer,  the
parties shall perform this Agreement according to its terms.

9.   CLOSING COSTS.  Seller will pay one-half of escrow fees, the
cost  of  the  title  commitment and  any  brokerage  commissions
payable.   The  Buyer  will pay the cost of  issuing  a  Standard
Owners  Title Insurance Policy in the full amount of the purchase
price,  if  Buyer shall decide to purchase the same.  Buyer  will
pay all recording fees, one-half of the escrow fees, and the cost
of an update to the Survey in Sellers possession (if an update is
required by Buyer.)  Each party will pay its own attorney's  fees
and costs to document and close this transaction.

10.  REAL ESTATE TAXES, SPECIAL ASSESSMENTS AND PRORATIONS.

     (a)  Because the Entire Property (of which the Property is a
     part) is subject to a triple net lease (as further set forth
     in  paragraph 11(a)(i), the parties acknowledge  that  there
     shall  be no need for a real estate tax proration.  However,
     Seller  represents  that to the best of its  knowledge,  all
     real  estate  taxes and installments of special  assessments
     due  and  payable in all years prior to the year of  Closing
     have been paid in full.  Unpaid real estate taxes and unpaid
     levied and pending special assessments existing on the  date
     of  Closing shall be the responsibility of Buyer and  Seller
     in   proportion  to  their  respective  Tenant   in   Common
     interests,  pro-rated, however, to the date of  closing  for
     the   period   prior  to  closing,  which   shall   be   the
     responsibility of Seller if Tenant shall not pay  the  same.
     Seller  and  Buyer  shall likewise pay  all  taxes  due  and
     payable   in   the  year  after  Closing  and   any   unpaid
     installments  of special assessments payable  therewith  and
     thereafter,  if  such  unpaid  levied  and  pending  special
     assessments and real estate taxes are not paid by any tenant
     of the Entire Property.

     (b)   All income and all operating expenses from the  Entire
     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  and shall be  responsible  for  all
     expenses  incurred prior to the date of Closing,  and  Buyer
     shall  be entitled to its proportionate share of all  income
     earned and shall be responsible for its proportionate  share
     of all operating expenses of the Entire Property incurred on
     and after the date of closing.

11.  SELLER'S REPRESENTATION AND AGREEMENTS.

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

      (i)   Except for the lease in existence between AEI  Income
and  Growth  Fund XXI Limited   Partnership and AEI Institutional
Net  Lease Fund '93 Limited Partnership (as "Landlord")       and
RTM Gulf Coast, Inc. ("Tenant") dated May 31, 1995, Seller is not
aware  of  any    leases of the Property.  The  above  referenced
lease  agreement has a first right of refusal in   favor  of  the
Tenant as set forth in Article 35 of said lease agreement,  which
right shall    apply to any attempted disposition of the Property
by  Buyer after this transaction.  The   above lease also has  an
option to purchase in favor of the tenant as set forth in article
34   of said lease.

     (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.

     (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



     Buyer Initial: /s/ DEB /s/ JFT  /s/ JAW IV
     Purchase Agreement for Arby's Restaurant-Montgomery, AL



     on  Buyer  after  the  Closing Date  without  Buyer's  prior
     consent,  which will not be unreasonably withheld.  However,
     Buyer  acknowledges that Seller retains the right both prior
     to  and after the Closing Date to freely transfer all  or  a
     portion  of  Seller's remaining undivided  interest  in  the
     Entire  Property, provided such sale shall not encumber  the
     Property being purchased by Buyer in violation of the  terms
     hereof or the contemplated Co-Tenancy Agreement.

12.  DISCLOSURES.

     (a)   Seller  has not received any notice of  any  material,
     physical,  or  mechanical defects of  the  Entire  Property,
     including  without  limitation, the plumbing,  heating,  air
     conditioning, ventilating, electrical system. 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 Entire 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  Entire
     Property after the Closing in the manner in which the Entire
     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  Entire
     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 Entire
     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  Entire  Property  or  the  migration  of
     Hazardous Materials from or to other property.  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
     Entire  Property  either before or after the  Closing  Date,
     except such Hazardous Materials on or in connection with the
     Entire 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.

     (f)    Buyer  acknowledges  that,  having  been  given   the
     opportunity  to  inspect  the  Entire  Property   and   such
     financial  information on the Lessee and Guarantors  of  the
     Lease as Buyer or its advisors shall request, if in Seller's
     possession, 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 provided and to be
     provided by Seller with respect to the Property, the  Entire
     Property  and  to  the Lessee and Guarantors  of  Lease  was
     obtained  from a variety of sources and Seller  neither  (a)
     has  made independent investigation or verification of  such
     information,


     Buyer Initial: /s/ DEB /s/ JFT  /s/ JAW IV
     Purchase Agreement for Arby's Restaurant-Montgomery, AL




     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 (d) - (f) above shall survive Closing.

13.  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,  subject  to  the
     exceptions contained in paragraph 8 above.

     (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  sign  and
     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.

14.   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.

     If Seller shall default, Buyer irrevocably waives any rights
to file a lis pendens, a specific performance action or any other
claim,  action or proceeding of any type in connection  with  the
Property or this or any other transaction involving the Property,
and  will  not  do  anything to affect title to the  Property  or
hinder,  delay  or  prevent  any  other  sale,  lease  or   other
transaction involving the Property (any and all of which will  be
null  and void), unless: it has paid the First Payment, deposited
the  balance  of the Second Payment for the purchase  price  into
escrow, performed all of its other obligations and satisfied  all
conditions  under  this  Agreement, and unconditionally  notified
Seller  that it stands ready to tender full performance, purchase
the  Property and close escrow as per this Agreement,  regardless
of  any  alleged  default  or misconduct  by  Seller.   Provided,
however, that in no event shall Seller be liable for any  actual,
punitive, consequential or speculative damages arising out of any
default by Seller hereunder.

15.  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


     Buyer Initial: /s/ DEB /s/ JFT  /s/ JAW IV
     Purchase Agreement for Arby's Restaurant-Montgomery, AL




     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.

     (iv)   Buyer certifies that the office of the Trustee  shall
     consist of five Trustees, any three of whom may act  on  any
     matter.

16.  DAMAGES, DESTRUCTION AND EMINENT DOMAIN.

     (a)   If, prior to closing, the Property or any part thereof
     should  be  destroyed  or  further  damaged  by  fire,   the
     elements,  or any cause, due to events occurring  subsequent
     to the date of this Agreement to the extent that the cost of
     repair exceeds $10,000.00, this Agreement shall become  null
     and void, at Buyer's option exercised, if at all, by written
     notice  to  Seller  within ten (10)  days  after  Buyer  has
     received  written notice from Seller of said destruction  or
     damage.  Seller, however, shall have the right to adjust  or
     settle  any  insured  loss until (i) all  contingencies  set
     forth  in Paragraph 6 hereof have been satisfied, or waived;
     and  (ii)  any  ten-day period provided for  above  in  this
     Subparagraph  16a  for  Buyer to  elect  to  terminate  this
     Agreement  has  expired or Buyer has, by written  notice  to
     Seller,  waived  Buyer's right to terminate this  Agreement.
     If  Buyer  elects to proceed and to consummate the  purchase
     despite  said  damage  or destruction,  there  shall  be  no
     reduction in or abatement of the purchase price, and  Seller
     shall  assign  to  Buyer  the  Seller's  right,  title,  and
     interest  in  and  to  all insurance proceeds  (pro-rata  in
     relation to the Entire Property) resulting from said  damage
     or  destruction to the extent that the same are payable with
     respect to damage to the Property, subject to rights of  any
     Tenant of the Entire Property.

     If  the cost of repair is less than $10,000.00, Buyer  shall
     be  obligated  to  otherwise  perform  hereinunder  with  no
     adjustment  to  the Purchase Price, reduction or  abatement,
     and  Seller shall assign Seller's right, title and  interest
     in and to all insurance proceeds pro-rata in relation to the
     Entire  Property,  subject to rights of any  Tenant  of  the
     Entire Property.

     (b)   If,  prior  to  closing, the  Property,  or  any  part
     thereof,  is  taken by eminent domain, this Agreement  shall
     become null and void, at Buyer's option.  If Buyer elects to
     proceed  and to consummate the purchase despite said taking,
     there  shall  be  no  reduction in,  or  abatement  of,  the
     purchase  price,  and  Seller  shall  assign  to  Buyer  the
     Seller's  right,  title, and interest in and  to  any  award
     made, or to be made, in the condemnation proceeding pro-rata
     in relation to the Entire Property, subject to rights of any
     Tenant of the Entire Property.

      In the event that this Agreement is terminated by Buyer  as
provided  above  in  Subparagraph 16a or 16b, the  First  Payment
shall  be immediately returned to Buyer (after execution by Buyer
of  such documents reasonably requested by Seller to evidence the
termination hereof).


     Buyer Initial: /s/ DEB /s/ JFT  /s/ JAW IV
     Purchase Agreement for Arby's Restaurant-Montgomery, AL



17.  BUYER'S 1031 TAX FREE EXCHANGE.

      While  Seller  acknowledges that Buyer  is  purchasing  the
Property  as  "replacement property" to  accomplish  a  tax  free
exchange,   Buyer   acknowledges  that   Seller   has   made   no
representations,  warranties, or agreements to Buyer  or  Buyer's
agents  that  the transaction contemplated by the Agreement  will
qualify  for such tax treatment, nor has there been any  reliance
thereon by Buyer respecting the legal or tax implications of  the
transactions contemplated hereby.  Buyer further represents  that
it has sought and obtained such third party advice and counsel as
it  deems  necessary in regards to the tax implications  of  this
transaction.

      Buyer  wishes  to  novate/assign the ownership  rights  and
interest  of  this Purchase Agreement to Amarillo  National  Bank
will  act  as  Accommodator  to  perfect  the  1031  exchange  by
preparing  an  agreement  of exchange of  Real  Property  whereby
Amarillo  National  Bank  will  be  an  independent  third  party
purchasing the ownership interest in subject property from Seller
and  selling the ownership interest in subject property to  Buyer
under  the  same  terms  and conditions  as  documented  in  this
Purchase Agreement.  Buyer asks the Seller, and Seller agrees  to
cooperate  in  the  perfection of  such  an  exchange  if  at  no
additional  cost or expense to Seller or delay  in  time.   Buyer
hereby  indemnifies  and holds Seller harmless  from  any  claims
and/or  actions  resulting from said exchange.  Pursuant  to  the
direction  of  Amarillo  National  Bank,  Seller  will  deed  the
property to Buyer.

18. CANCELLATION

     If  any party elects to cancel this Contract because of  any
     breach by another party or because escrow fails to close  by
     the  agreed date, the party electing to cancel shall deliver
     to escrow agent a notice containing the address of the party
     in  breach and stating that this Contract shall be cancelled
     unless  the  breach  is cured within 13 days  following  the
     delivery  of  the notice to the escrow agent.  Within  three
     days  after  receipt of such notice, the escrow agent  shall
     send it by United States Mail to the party in breach at  the
     address contained in the Notice and no further notice  shall
     be  required. If the breach is not cured within the 13  days
     following  the  delivery of the notice to the escrow  agent,
     this Contract shall be cancelled.

19. 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  August  2,  1999,
     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.


     Buyer Initial: /s/ DEB /s/ JFT  /s/ JAW IV
     Purchase Agreement for Arby's Restaurant-Montgomery, AL




     (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:

          Attention:  Robert P. Johnson
            AEI   Institutional  Net  Lease  Fund   '93   Limited
     Partnership
          1300 Minnesota World Trade Center
          30 E. 7th Street
          St. Paul, MN  55101

     If to Buyer:

          The Catharine C. Whittenburg Testamentary Trust for
          J. A. Whittenburg IV or Assigns
          Post Office Box 26
          Amarillo, TX  79105

      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.






     Buyer Initial: /s/ DEB /s/ JFT  /s/ JAW IV
     Purchase Agreement for Arby's Restaurant-Montgomery, AL



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


BUYER:     The  Catharine C. Whittenburg Testamentary  Trust  for
J.A. Whittenburg IV or Asigns

          By:  /s/ Diane E Bowes
                   A Trustee

                   Diane E Bowes
                  (Type or Print Name)

          By:  /s/ Jack F Turner
                   A Trustee

                   Jack F Turner
                  (Type or Print Name)

          By       J.A. Whittenburg IV
                   A Trustee

                   J. A. Whittenburg IV
                  (Type or Print Name)

          By:
                   A Trustee

                  (Type or Print Name)

          By:
                   A Trustee


                  (Type or Print Name)



     Buyer Initial: /s/ DEB /s/ JFT  /s/ JAW IV
     Purchase Agreement for Arby's Restaurant-Montgomery, AL




          AEI Income & Growth Fund XXI Limited Partnership
          By:  AEI Fund Management XXI, Inc.,  its  corporate
               general partner

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







                               EXHIBIT "A"


     Commencing at the Northeast corner of the Southeast  Quarter
     of  the  Southwest Quarter of Section 16, Township 16 North,
     Range  18 East, Montgomery City and County, Alabama,  thence
     West a distance of 535.66 feet; thence North 328.83 feet  to
     the  Southwest corner of Lot 1-T, of the Taco Bell Plat  No.
     3,  Zelda Road as recorded in the Montgomery County  Probate
     Office, said point being on the curve of the Northerly right
     of  way  of Zelda Road, said curve having a radius of 392.86
     feet,  a  central angle of 30 13' 45" and a chord of  204.88
     feet  with  a  chord  bearing of S  59  16'  00"  E,  thence
     southeasterly  along said curve to the end  of  said  curve,
     said  point being the Southeast corner of said Lot 1-T, also
     being  the point of beginning.  Thence N 39 28' 53" E,  from
     the  point of beginning along the southeasterly line of said
     Lot  1-T, a distance of 152.21 feet to an iron pin found  on
     the  southerly  right  of  way of Interstate  Highway  I-85;
     thence  S 52 30' 39" E, along the southerly right of way  of
     Interstate Highway I-85 a distance of 311.90 feet to a found
     iron pin; thence S 74 07' 41" W a distance of 270.89 feet to
     a  found  iron  pin on the northerly right of way  of  Zelda
     Road; thence N 20 20' 05" W along the Northerly right of way
     of  Zelda Road a distance of 28.41 feet to the beginning  of
     the  curve of the northerly right of way of Zelda Road, said
     curve having a radius of 392.86 feet, a central angle of  20
     38' 00" and a chord of 140.71 feet with a chord bearing of N
     31  38' 47" W; thence Northwesterly along said curve to  the
     end of said curve, said point being the southeast corner  of
     said  Lot  1-T, and also being the point of beginning.   The
     said  tract  of land is located in the Northeast Quarter  of
     the  Southwest  Quarter of Section 16,  Township  16  North,
     Range 18 East, Montgomery City and County, Alabama.