AGREEMENT OF PURCHASE AND SALE
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         This AGREEMENT OF PURCHASE AND SALE (the  "Agreement"),  dated December
31,  1997  for  reference  purposes  only,  is  by  and  between  AMERICAN  LAND
CONSERVANCY, a California nonprofit public benefit corporation ("Seller"),  and,
DEL WEBB CONSERVATION HOLDING CORP., an Arizona corporation ("Buyer").


                                    RECITALS
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          A.  The  addresses  and  telephone  numbers  of the  parties  to  this
Agreement are as follows. Telephone numbers are included for information only.

SELLER:                                      BUYER:

American Land Conservancy                    Del Webb Conservation Holding Corp.
456 Montgomery Street, Suite 1450            6001 North 24th Street
San Francisco, CA 94104                      Phoenix, Arizona 85016
Attn: Harriet Burgess                        Attn: LeRoy C. Hanneman, Jr.
Tel: (415) 403-3850                          Tel: (602) 808-7800
Fax: (415) 403-3856                          Fax: (602) 808-8097

          B. Seller is a  conservation  organization  exempt from taxation under
Section 501(c)(3) of the Internal Revenue Code of 1986, as amended (the "Code").
Seller's  mission  is to  acquire  for  public  trust,  and  to  facilitate  the
acquisition  by  appropriate  public  agencies of,  environmentally  significant
resources.  One of the means by which  Seller  accomplishes  this  mission is to
undertake,  in  conjunction  with  appropriate  federal  agencies,  exchanges of
federal land as authorized  under the Federal Land Exchange  Facilitation Act of
1982 ("FLEFA").

          C. Seller has  entered  into that  certain  Agreement  of Sale,  dated
January 29, 1996,  between Seller,  as buyer,  and Jack J. Dreyfus,  Jr, Dreyfus
Charitable  Foundation,  a New York not for profit  corporation,  and William P.
Rogers,  as  sellers  (collectively,  "Dreyfus"),  as  amended  by that  certain
Amendment to Agreement of Sale, dated as of July 29, 1996, as further amended by
that certain  Second  Amendment  to  Agreement of Sale,  dated as of January 31,
1997, as further amended by that certain Reinstatement of and Third Amendment to
Agreement  of Sale,  dated as of  April  15,  1997  (as  amended,  the  "Dreyfus
Agreement"),  pursuant to which Dreyfus has agreed to sell to Seller, and Seller
has agreed to purchase  from  Dreyfus,  the  following:  (i) that  certain  real
property  located on the eastern shore of Lake Tahoe in Washoe  County,  Nevada,
which  is  more  particularly   described  in  Exhibit  A  attached  hereto  and
incorporated herein by reference (the "Subject Property"),  (ii) Seller's rights
in and to that  certain  (30) year  reservation  in favor of Seller  relating to
approximately  ninety  (90)  acres  of real  property  located  adjacent  to the
Property  as set forth at Page 777 of the  Warranty  Deed  recorded  January 10,
1972, in Book 605, Page 773, in the Official  Records of Washoe County,  Nevada,
under Document No. 231291 (the "Reservation"),  and (iii) the certificated water
rights  set forth in  Exhibit  B  attached  hereto  and  incorporated  herein by
reference (the "Water  Rights") (the
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Subject Property, the Reservation and the Water Rights are collectively referred
to herein as the "Dreyfus Property").

          D. Seller  entered into the Dreyfus  Agreement  with the  intention of
acquiring the Dreyfus  Property and conveying the Dreyfus Property to the United
States of America for management by the United States Department of Agriculture,
Forest Service (the "USFS"),  through land exchange transactions with the United
States Department of Interior,  Bureau of Land Management ("BLM"), as authorized
by FLEFA.

          E.  Seller and Buyer have  entered  into that  certain  Memorandum  of
Understanding,  dated  November  14, 1997 (the  "MOU"),  which  provides for the
acquisition and  disposition by Seller and Buyer of the entire Dreyfus  Property
in connection with certain pending federal land exchange transactions  involving
Buyer or Seller  and  certain  other  transactions  and which  contemplates  the
execution and delivery of certain  modifications to the Dreyfus Agreement by the
parties thereto.

          F. Since Dreyfus has  determined  that it is unwilling to  restructure
the  Dreyfus  Agreement  in the manner  contemplated  by the MOU,  it has become
necessary  to  restructure  the terms and  conditions  of  Seller's  and Buyer's
acquisition of the Dreyfus Property as contemplated in the MOU.

          G.  Seller  and Buyer now  intend  for  Seller to  acquire  all of the
Dreyfus  Property on or before December 31, 1997 in accordance with the terms of
the Dreyfus  Agreement for a purchase price of Forty-Eight  Million Five Hundred
Thousand Dollars  ($48,500,000)  (the "Dreyfus Purchase Price"),  which shall be
payable as follows:  (i)  deposits  previously  made to Dreyfus by Seller in the
amount of Three Million Three Hundred Ten Thousand Dollars  ($3,310,000),  which
are  credited  against the Dreyfus  Purchase  Price,  (ii) a cash payment at the
close of escrow in the amount of Twelve Million Dollars ($12,000,000), and (iii)
delivery of a nonrecourse  promissory  note in the principal sum of Thirty-Three
Million One Hundred Ninety Thousand Dollars  ($33,190,000) (the "Dreyfus Note"),
from Seller to Dreyfus, which shall be secured by a first priority deed of trust
encumbering  the Dreyfus  Property (the "Dreyfus Deed of Trust") and which shall
mature on April 1, 1998.

          H. Immediately  upon Seller's  acquisition of the Dreyfus Property and
pursuant to the other terms and  conditions  set forth below,  Seller shall sell
the  Dreyfus  Property  to Buyer for a purchase  price equal to the sum of Fifty
Million Four Hundred  Thousand  Dollars  ($50,400,000),  which  constitutes  the
appraised fair market value of the Dreyfus Property, as finally approved by USFS
and BLM,  plus the amount of certain  clearances  costs  previously  incurred by
Seller,  which purchase price shall be payable as follows: (i) a cash payment by
Buyer to Seller at the close of escrow in the  principal  sum of Twelve  Million
Dollars  ($12,000,000),  (ii) Buyer taking title to the Dreyfus Property subject
to the  deed of trust  securing  the  Dreyfus  Note,  and  (iii)  delivery  of a
nonrecourse  promissory  note in the  principal  sum equal to the balance of the
purchase  price,  from  Buyer to  Seller,  which  shall be  secured  by a second
priority deed of trust encumbering the Dreyfus Property.
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          I. In order to facilitate Seller's acquisition of the Dreyfus Property
pursuant to the terms of the  Dreyfus  Agreement,  Buyer will  advance to Seller
through escrow cash in the amount of Twelve Million Dollars  ($12,000,000) on or
before December 31, 1997,  which shall be used to make the cash payment due from
Seller to Dreyfus at the close of escrow of Seller's  acquisition of the Dreyfus
Property and shall be credited against the cash payment due Seller from Buyer in
connection with Buyer's acquisition of the Dreyfus Property from Seller.

         NOW, THEREFORE,  in consideration of the premises and mutual covenants,
agreements and representations  herein contained and subject to the satisfaction
of the conditions set forth herein, the parties hereto agree as follows:

          1. Purchase and Sale.  Immediately  upon Seller's  acquisition  of the
Dreyfus  Property from Dreyfus  pursuant to the terms of the Dreyfus  Agreement,
Seller  shall  sell to Buyer,  and Buyer  shall  purchase  from  Seller,  all of
Seller's right,  title and interest in, to and under the Dreyfus Property on the
terms and conditions set forth herein

          2. Purchase Price.

                   (a) Purchase Price. The purchase price (the "Purchase Price")
for the  Dreyfus  Property  shall be an  amount  equal  to the sum of (a)  Fifty
Million Four Hundred  Thousand  Dollars  ($50,400,000),  which  constitutes  the
appraised fair market value of the Dreyfus Property finally approved by USFS and
BLM, plus (b) the aggregate  amount of Sixty-Five  Thousand  Dollars  ($65,000),
which represents certain costs incurred by Seller in connection with the Dreyfus
Agreement which Buyer has agreed to reimburse.

                  (b) Payment of Purchase  Price.  The  Purchase  Price shall be
paid by Buyer to Seller as follows:

                            (i)  Buyer's  delivery  to Seller at the Closing (as
defined below) of a cash payment in the amount equal to Twelve  Million  Dollars
($12,000,000) (the "Cash Payment");

                            (ii)  Buyer  taking  title to the  Dreyfus  Property
subject to the Dreyfus Deed of Trust; provided,  that, until the Dreyfus Note is
paid in full and the Dreyfus  Deed of Trust is  reconveyed  by  Dreyfus,  Seller
shall not amend or modify any of the terms of the  Dreyfus  Note or the  Dreyfus
Deed of Trust without first obtaining Buyer's written approval; and

                            (iii) Buyer's delivery to Seller at the Closing of a
nonrecourse  promissory  note by Buyer in favor of Seller in the  principal  sum
equal to Five Million Two Hundred  Seventy-Five  Thousand  Dollars  ($5,275,000)
(the  "ALC  Note").  The ALC  Note  shall be in form  and  substance  reasonably
satisfactory  to Buyer and  Seller.  The ALC Note  shall be secured by a deed of
trust and assignment of rents encumbering the Dreyfus  Property,  which shall be
subject only to the title  exceptions  set forth in Section 6 of this  Agreement
and shall be in form and substance  reasonably  satisfactory to Buyer and Seller
(the "ALC Deed of Trust").

                  (c) Cash  Payment.  Buyer shall  deliver cash in the amount of
Twelve Million Dollars ($12,000,000) into Escrow (as defined below) at least one
day before the scheduled 
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closing of Seller's acquisition of the Dreyfus Property from Dreyfus pursuant to
the terms of the Dreyfus  Agreement  and, in any event on or before 9:00 a.m. on
December  31,  1997.  Seller  and  Buyer  understand  and  agree  that  Seller's
acquisition of the Dreyfus Property from Dreyfus and Buyer's  acquisition of the
Dreyfus Property from Seller shall occur in immediately consecutive transactions
and that the Twelve Million Dollars ($12,000,000) deposited into Escrow by Buyer
shall be used by  Seller to make the cash  payment  due from  Seller to  Dreyfus
under the  Dreyfus  Agreement  at the  closing of  Seller's  acquisition  of the
Dreyfus  Property  and shall  constitute  the Cash Payment due Seller from Buyer
pursuant to Section 2(b)(i) of this Agreement.

          3. Escrow and Closing.

                   (a) Escrow. Buyer has opened an escrow (the "Escrow") for the
purpose of closing Buyer's  purchase of the Subject  Property at the Scottsdale,
Arizona office of First American Title Insurance Company (the "Escrow Holder").

                   (b) Escrow  Instructions.  Buyer and Seller  shall  promptly,
upon  request,  provide the Escrow Holder with escrow  instructions  which shall
incorporate  the  terms of and be  consistent  with  this  Agreement,  and shall
provide that if there is any  inconsistency  between the terms of this Agreement
and such escrow  instructions,  the terms of this  Agreement  shall  prevail and
control.

                   (c) Closing.  The closing (the "Closing") of Buyer's purchase
of the Dreyfus  Property shall occur at the time that all of the  fully-executed
documents and funds  described in Sections 3(d) and 3(e) have been  delivered to
the Escrow Holder.  The Closing shall take place on or before December 31, 1997,
unless  such date is  extended  in  writing by Buyer and  Seller  (the  "Closing
Date").

                   (d)  Documents to be Delivered by Seller.  Not later than one
(1) business  day before the Closing  Date,  Seller shall  deliver to the Escrow
Holder the following documents and items:

                            (i) A grant,  bargain and sale deed,  in  recordable
form, duly executed by Seller,  conveying to Buyer all of Seller's right,  title
and interest in and to the Subject Property and  Reservation,  which shall be in
form and substance reasonably satisfactory to Buyer and Seller;

                            (ii) A water rights  quitclaim  deed,  in recordable
form, duly executed by Seller,  conveying to Buyer all of Seller's right,  title
and interest in and to the Water  Rights,  which shall be in form and  substance
reasonably satisfactory to Buyer and Seller;

                            (iii)  A bill  of sale  conveying  certain  personal
property located on the Subject Property from Buyer to Seller, which shall be in
form and substance reasonably satisfactory to Buyer and Seller;

                            (iv) A non-foreign certificate in form and substance
reasonably satisfactory to Buyer and Seller;
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                            (v) The  originals or copies (if  originals  are not
available)  of any  governmental  licenses or permits  obtained by the  previous
owners of the Dreyfus Property relating to the construction,  development or use
of the  Dreyfus  Property,  to the extent such  licenses  and permits are in the
possession of Seller;

                            (vi)  All  keys,  security  cards  and  other  items
required in order to gain access or to use the Dreyfus Property which are in the
possession  of Seller or any of the  brokers  referenced  in  Section 14 of this
Agreement;

                            (vii) A purchase and sale  agreement  between  Buyer
and Seller  providing for the purchase by Seller from Buyer after the Closing of
a portion of the Subject  Property  having an appraised  fair market  value,  as
finally  approved by USFS and BLM, of  approximately  Three Million Four Hundred
Thousand Dollars ($3,400,000) in connection with the portion of Seller's pending
land exchange transaction with Perma-Bilt,  a Nevada corporation  ("Perma-Bilt")
which is referred  to by Seller and  Perma-Bilt  as "Phase 2B" (the  "Perma-Bilt
Exchange"),  which shall be in form and  substance  reasonably  satisfactory  to
Buyer and Seller (the "Perma-Bilt Agreement");

                            (viii)  Written   confirmation  to  Buyer  from  the
University and Community College System of Nevada ("UNR"), in form and substance
reasonably  satisfactory  to Buyer,  regarding the commitment of UNR to purchase
from  Buyer all of the  existing  structures  and  improvements  located  on the
Subject  Property,  together with a reserved estate relating to a portion of the
Subject Property which shall provide access to and use of such  improvements and
shall be acceptable to USFS and Buyer (the "Reserved  Estate) (the  Improvements
and  the  Reserved  Estate  are  collectively   referred  to  herein,  the  "UNR
Improvements");

                            (ix)  Written  confirmation  to Buyer  from USFS and
BLM, in form and substance reasonably satisfactory to Buyer, regarding the final
approved  appraised fair market value attributed to the Dreyfus Property and the
allocation of such value to the Reserved Estate and the Improvements;

                            (x) Such other documents or certificates as Buyer or
its counsel shall reasonably request.

                   (e) Funds and  Documents to be Delivered by Buyer.  Not later
than one (1) business day before the Closing Date,  Buyer shall deliver or cause
to be delivered to the Escrow Holder the following documents and funds:

                            (i)  Cash  or  immediately  available  funds  in the
amount  equal to the Cash  Payment plus any costs or  prorations  chargeable  to
Buyer under this Agreement;

                            (ii) The original ALC Note;

                            (iii) The original ALC Deed of Trust;

                            (iv) The Perma-Bilt Agreement; and
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                            (v) Such other  documents or  certificates as Seller
or its counsel shall reasonably request.

                   (f) Closing  Expenses and Fees.  All real property  taxes and
assessments relating to the Dreyfus Property shall be prorated between Buyer and
Seller as of the Closing. All transfer taxes due in connection with the transfer
of the Dreyfus  Property  from  Seller to Buyer  shall be paid by Seller.  Buyer
shall pay all other closing costs and expenses  incurred in connection with this
transaction,  including without  limitation all escrow fees,  recording fees and
title insurance policy expenses.

          4.  Clearances.  Buyer and  Seller  understand  and  acknowledge  that
certain clearances (the "Clearances") must be obtained, as required under FLEFA,
before any portion of the Dreyfus Property will be included in any of Buyer's or
Seller's pending land exchange  transactions,  including  without  limitation an
environmental  assessment and approval of title  condition.  Buyer shall use its
reasonable  efforts to obtain,  on or before April 1, 1998, all final Clearances
required  with  respect  to the  Dreyfus  Property  in order to  facilitate  the
parties'  pending  land  exchange  transactions.  All costs  incurred  after the
Closing in connection  with obtaining such  Clearances  shall be borne by Buyer.
Seller  shall take such  reasonable  actions  requested  by Buyer to  facilitate
Buyer's efforts to obtain the legislative  approvals necessary to permit BLM and
Buyer to  proceed  with the  processing  and  closing  of the Phase 2 portion of
Buyer's  pending  federal land exchange with BLM. The  obligations  of Buyer and
Seller under this Section 4 shall survive the Closing.

          5. Buyer's  Inspection of Dreyfus  Property;  Condition of the Dreyfus
Property.  Buyer hereby  acknowledges that Buyer has completed a full inspection
of all aspects of the Dreyfus  Property  and that the Dreyfus  Property is being
sold by Seller to Buyer  "as-is,"  without any  warranties  or  representations,
express or implied,  except for the  representations and warranties set forth in
this Agreement. Buyer acknowledges that Buyer is purchasing the Dreyfus Property
on the basis of its own investigation and assumes the risk that adverse physical
and   environmental   conditions   may  not  have  been   revealed   by  Buyer's
investigation. Closing of escrow shall be evidence that Buyer is satisfied as to
the value and condition of the Dreyfus Property,  including without  limitation,
its physical and  environmental  condition,  title condition,  exact acreage and
boundary lines,  location of easements and rights of way, access,  water supply,
drainage and extent of needed repairs. Buyer hereby waives, releases and forever
discharges Seller and its employees, agents and assigns from any and all claims,
actions, liabilities, damages and expenses whatsoever, direct or indirect, which
Buyer now has or which may arise in connection with the Dreyfus Property, except
with respect to any matter arising out of this Agreement or any gross negligence
or willful misconduct by Seller or its employees, agents and assigns relating to
the Dreyfus Property or the transactions contemplated hereby.

          6.  Examination  of Title.  Seller  shall  convey title to the Dreyfus
Property  subject only to: (a) real estate taxes and assessments not yet due and
payable;  (b) all of the title exceptions set forth in that certain  Preliminary
Report No.  501535CS  (2nd  Amended),  dated  December 5, 1997,  issued by First
American  Title Company of Nevada;  (c) Dreyfus Deed of Trust;  (d) the standard
printed  exceptions on the form of title insurance  policy to be issued to Buyer
pursuant to Section 7; and (e) any other matters approved by Buyer.
                                       6

          7. Title  Insurance.  Buyer may obtain,  at Buyer's  sole  expense,  a
standard  owner's or extended  owner's policy of title  insurance  insuring that
title to the Dreyfus  Property is vested in Buyer at the Closing subject only to
the exceptions noted in Section 6.

          8. Seller's Representations and Warranties. Seller makes the following
representations and warranties in favor of Buyer:

                   (a) Seller is a nonprofit  public  benefit  corporation  duly
organized,  validly existing and in good standing under the laws of the State of
California  and has the full power and  authority  to execute and  deliver  this
Agreement and to perform its  obligations  hereunder  without the consent of any
other party.  Notwithstanding  anything herein to the contrary, it is understood
and agreed that no  representation  or warranty is being made by Seller,  and no
condition to the performance of Buyer's  obligations  under this Agreement shall
exist, with respect to any consent that may be required under the Reservation in
connection  with the transfer  thereof to Buyer.  Seller shall have obtained all
required   corporate  and  other  approvals  required  in  connection  with  the
execution,  delivery and performance of this Agreement.  At the Closing,  Seller
shall own and shall  have the power to sell,  transfer  and  convey to Buyer all
right, title and interest in and to the Dreyfus Property.

                   (b) As of the date of this  Agreement,  there  is no  pending
suit or action against  Seller which,  if adversely  decided,  would prevent the
consummation  of  the  transactions  contemplated  by  this  Agreement.  Without
limiting the generality of the foregoing,  to the best of Seller's knowledge, as
of the date of this Agreement,  there are no actual or threatened suits, actions
or  proceedings,  with  respect to all or part of the Dreyfus  Property  (i) for
condemnation  or (ii)  alleging any material  violation of any  applicable  law,
regulation, ordinance or code (collectively, "Laws and Regulations").

                   (c) Seller has not received any written notice (which remains
outstanding) from any governmental authority stating that all or any part of the
Dreyfus Property violates any Laws and Regulations in any material respect.

                   (d) To the best of Seller's knowledge,  the conveyance of the
Dreyfus  Property to Buyer will not violate any applicable Laws and Regulations,
including without limitation, subdivision laws.

                   (e) Seller  represents and warrants that it is not a "foreign
person" as defined in Section 1445 of the Code.  Seller's United States Taxpayer
Identification Number is 94-3121-656.

                   (f) All documents and items  furnished by Seller to Buyer are
true, correct, accurate and complete to Seller's best knowledge.

                   (g) To Seller's best knowledge, there is no lawsuit, judicial
proceedings or dispute  currently  pending which may affect the Dreyfus Property
which has not been disclosed to Buyer.
                                       7

          9. Buyer's  Representations and Warranties.  Buyer makes the following
representations and warranties in favor of Seller:

                   (a) Buyer is a corporation  duly organized,  validly existing
and in good  standing  under the laws of the State of  Arizona  and has the full
power and  authority  to execute and deliver this  Agreement  and to perform its
obligations  hereunder.  Buyer shall have  obtained all required  corporate  and
other  approvals  required  in  connection  with  the  execution,  delivery  and
performance of this Agreement.

          10.  Survival  of   Representations   and   Warranties.   All  of  the
representations and warranties of Seller and Buyer set forth in Sections 8 and 9
of this Agreement shall survive the Closing.

          11. Possession, Risk of Loss. Possession of the Dreyfus Property shall
be  delivered to Buyer at the  Closing,  free and clear of any other  possessory
interest.  All risk of loss or damage with respect to the Dreyfus Property shall
pass from Seller to Buyer at the Closing.

          12.  Notices.  Any  notice,  demand,   approval,   consent,  or  other
communication  required or desired to be given under this  Agreement  in writing
shall be given in the  manner  set  forth  below,  addressed  to the party to be
served at the  addresses  set forth in Recital A, or at such other  address  for
which that party may have given notice under the  provisions of this Section 12.
Any notice, demand, approval,  consent, or other communication given by (a) mail
shall be deemed to have been given three (3) days  following  the date such mail
is deposited in the United States mail, certified;  (b) overnight common carrier
courier  service shall be deemed to be given on the business day (not  including
Saturday)  immediately  following  the date it was  deposited  with such  common
carrier;  (c)  delivery in person or by  messenger  shall be deemed to have been
given upon delivery in person or by messenger; or (d) electronic facsimile shall
be deemed to have been  given on the  earlier of (i) the date and at the time as
the sending party (or such party's agent) shall have received from the receiving
party  (or  such  party's  agent)  oral  confirmation  of the  receipt  of  such
transmission or (ii) one hour after the completion of transmission of the entire
communication.

          13.  Attorneys'  Fees. If any party to this  Agreement  shall take any
action to enforce this Agreement or bring any action or commence any arbitration
for any relief against any other party, declaratory or otherwise, arising out of
this Agreement,  the losing party shall pay to the prevailing party a reasonable
sum for  attorneys'  fees incurred in bringing such suit or  arbitration  and/or
enforcing  any judgment  granted  therein,  all of which shall be deemed to have
accrued upon the  commencement  of such action or arbitration  and shall be paid
whether  or not such  action or  arbitration  is  prosecuted  to  judgment.  Any
judgment or order entered in such action or arbitration shall contain a specific
provision  providing for the recovery of attorneys'  fees and costs  incurred in
enforcing such judgment.  The amount of attorneys'  fees due hereunder  shall be
determined by a court of competent  jurisdiction and not by a jury. For purposes
of this  section,  attorneys'  fees  shall  include,  without  limitation,  fees
incurred in the following:  (a) post-judgment motions; (b) contempt proceedings;
(c) garnishment,  levy, and debtor and third party examinations;  (d) discovery;
and (e) bankruptcy litigation.
                                       8

          14. Brokers' Commissions.  Buyer and Seller each warrant and represent
to the other that it has not  retained,  nor is it obligated  to, any person for
brokerage,  finder's or similar  services in  connection  with the  transactions
contemplated  by this Agreement,  and that no commission,  finder's fee or other
brokerage  or  agent's  compensation  can be  properly  claimed by any person or
entity based upon the acts of such party with regard to the  transactions  which
are the subject matter of this Agreement. Each party shall indemnify, defend and
hold harmless the other party from and against all claims, demands, liabilities,
losses, damages, costs and expenses (including,  without limitation,  reasonable
attorneys'  fees,  costs of expert  witnesses,  court costs and other litigation
expenses)  arising  from or  related  to such  party's  breach of the  foregoing
representation and warranty.  The  representations,  warranties and covenants of
Buyer and Seller set forth in this Section 14 shall survive the Closing.

          15. Time of the Essence. Time is of the essence of this Agreement.  In
the event that any date specified in this Agreement falls on a Saturday,  Sunday
or a public holiday, such date shall be deemed to be the succeeding day in which
the public agencies and major banks are open for business.

          16. Press Releases.  Seller and Buyer shall consult with each other as
to, and jointly  approve,  the form and  substance of any press release or other
public disclosure of matters related to the Dreyfus Property,  this Agreement or
any of the transactions  contemplated hereby;  provided,  however,  that nothing
herein shall be deemed to prohibit  either party hereto from making  (subject to
such prior  consultation  with the other party as shall be practicable under the
circumstances)  any disclosure  that its counsel deems necessary or advisable in
order to fulfill any of the requirements  under FLEFA applicable to such party's
pending land exchange  transaction or any other legal disclosure  obligations of
such party. The covenants of Buyer and Seller set forth in this Section 16 shall
survive the Closing.

          17. Funding of UNR Improvements.  If UNR is unable to raise sufficient
funds to acquire the UNR  Improvements on or before December 31, 1998 from Buyer
for a  purchase  price  equal  to the  appraised  fair  market  value of the UNR
Improvements,  as finally  approved by USFS and BLM, Buyer and Seller shall each
contribute to UNR, in equal amounts,  cash in the amount necessary to enable UNR
to purchase the UNR  Improvements  from Buyer for such purchase  price (the "UNR
Contribution");  provided,  that in no event shall Seller be required to advance
to UNR an amount  in  excess  of One  Million  Seven  Hundred  Thousand  Dollars
($1,700,000) hereunder. The funds required to be advanced to UNR by Seller under
this Section 17 shall be made available to Seller by Buyer from Buyer's  payment
of the ALC Note upon the maturity thereof. If the ALC Note matures  concurrently
with or  prior to the  closing  of UNR's  acquisition  of the UNR  Improvements,
Seller shall deposit into an interest bearing escrow account under joint control
of Seller and Buyer a portion of the cash  proceeds paid to Seller under the ALC
Note, which portion shall be equal to the amount of the UNR Contribution payable
by Seller  pursuant to this Section 17.  Concurrently  with such deposit,  Buyer
shall  deposit  into such  escrow  account  cash in an amount  equal to Seller's
deposit  to fund a portion of Buyer's  required  contribution  to UNR under this
Section  17. At the time that UNR  acquires  the UNR  Improvements,  the amounts
required of Buyer and Seller to fund such  acquisition  pursuant to this Section
17, if any,  shall be  released to UNR from the funds  deposited  into escrow
                                       9

by Buyer and Seller for UNR's use in connection with such  acquisition,  and any
funds  deposited into escrow by Buyer and Seller which have not been released to
UNR will be released to Buyer and Seller, as appropriate. The covenants of Buyer
and Seller set forth in this Section 17 shall survive the Closing.

          18. Personal Property.  Buyer shall comply with all of the obligations
of Seller  relating to the Dreyfus  Property as set forth in that certain letter
agreement,  dated December 24, 1997 between Dreyfus and Seller,  and executed by
Buyer.  The  covenant  of Buyer set forth in this  Section 18 shall  survive the
Closing.

          19.  Binding on Successors.  This Agreement  shall be binding not only
upon the parties but also,  subject to the  limitations  set forth in Section 20
upon their heirs,  personal  representatives,  assigns,  and other successors in
interest.

          20.  Assignment.  Neither  Buyer nor Seller  may assign its  interests
under this Agreement to any other party without the prior written consent of the
other party. In any event,  any such assignment  shall not release the assigning
party from its obligations under this Agreement.

          21. Entire Agreement; Modification; Waiver. This Agreement constitutes
the entire agreement  between Buyer and Seller  pertaining to the subject matter
contained  in it  and  supersedes  all  prior  and  contemporaneous  agreements,
representations, and understandings,  including, without limitation, the MOU. No
supplement,  modification or amendment of this Agreement shall be binding unless
executed in writing by all the parties.  No waiver of any of the  provisions  of
this  Agreement  shall be  deemed  or shall  constitute  a waiver  of any  other
provision,  whether or not similar, nor shall any waiver constitute a continuing
waiver.  No waiver  shall be  binding  unless  executed  in writing by the party
making the waiver.

          22.  Further  Assurances.  Seller and Buyer shall  execute and deliver
such additional  documents,  including escrow instructions,  and shall take such
other actions as may be reasonable  and necessary to carry out the provisions of
this Agreement.

          23.  Severability.  Each provision of this Agreement is severable from
any and all other provisions of this Agreement.  Should any provision(s) of this
Agreement be for any reason  unenforceable,  the balance shall nonetheless be of
full force and effect.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]
                                       10

          24.  Governing Law. This Agreement  shall be governed and construed in
accordance with the laws of the State of Nevada.

          25.  Counterparts.  This  Agreement  may be  executed  in two or  more
counterparts,  each of which shall be deemed an original  (including copies sent
to a party by telecopy or  facsimile  transmission),  but all of which  together
constitute one and the same instrument.

          26. No Third Party Beneficiaries.  This Agreement has been made and is
made solely for the benefit of Buyer and Seller and their respective  successors
and  permitted  assigns.  Nothing in this  Agreement  is  intended to confer any
rights or remedies  under or by reason of this  Agreement  on any persons  other
than the parties to it and their respective successors and permitted assigns.

          27. No  Partnership.  Nothing  contained  in this  Agreement  shall be
deemed to constitute a joint venture or partnership between Buyer and Seller, it
being the intent of the parties that only the  relationship  of buyer and seller
between Buyer and Seller shall be established.

         IN WITNESS WHEREOF,  the parties hereto have executed this Agreement as
set forth below.

                                 SELLER:

                                 AMERICAN LAND CONSERVANCY, a 
                                 California nonprofit public benefit corporation


Dated:  December 31, 1997        By: /s/ Harriet Burgess
                                    --------------------------------------------
                                         Harriet Burgess
                                         President


                                 BUYER:

                                 DEL WEBB CONSERVATION HOLDING 
                                 CORP., an Arizona corporation


Dated:  December 31, 1997        By: /s/ Mary S. Alexander
                                    --------------------------------------------
                                    Name: Mary S. Alexander
                                         ---------------------------------------
                                    Title: Vice President - Secretary
                                          --------------------------------------
                                       11

         The undersigned hereby acknowledge  receipt of a fully-executed copy of
this  Agreement  and  their  agreement  to act  in  accordance  with  all of the
provisions of this Agreement in connection with the closing of the  transactions
contemplated by this Agreement.

                                          WESTERN TITLE COMPANY


Dated:  December 31, 1997                 By: /s/ Dolores Monroe
                                             -----------------------------------
                                              Dolores Monroe


                                          FIRST AMERICAN TITLE INSURANCE COMPANY


Dated:  December 31, 1997                 By: /s/ Gerry Ring Waltz
                                             -----------------------------------
                                               Gerry Ring Waltz


EXHIBITS:
- ---------

A - Legal Description of Dreyfus Property
B - Description of Water Rights
                                       12

                                                          Exhibit A to Agreement
                                                            of Purchase and Sale


                      LEGAL DESCRIPTION OF DREYFUS PROPERTY
                      -------------------------------------


         The real  property  referred  to herein  is  situate  in the  County of
Washoe, State of Nevada, and legally described as follows:

         Fractional  Sections  11 and 14,  Township  15  North,  Range  18 East,
         M.D.B&M.,  EXCEPTING THEREFROM parcels conveyed to the United States of
         America,  by Deed  recorded  January 10, 1972,  in Book 605,  Page 773,
         Official Records of Washoe County, Nevada, under Document No. 231291.

         A.P.N. 130-360-08.

                                      A-1

                                                          Exhibit B to Agreement
                                                            of Purchase and Sale


                           DESCRIPTION OF WATER RIGHTS
                           ---------------------------


         Those  certain  water  rights on file in the Office of the Nevada State
Engineer, Division of Water Resources, described as follows:

             Application    Certificate         Duty              Uses
             -----------    -----------         ----              ----

                12083           3908         0.0067 csf      Domestic
                12085           4332         0.2500 csf      Power and Domestic
                12086           4333         0.2500 csf      Power and Domestic
                12087           4334         0.2500 csf      Power and Domestic

                                      B-1