Document:

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                                                                  EXHIBIT 10.1.1
                                                                  --------------

                              AMENDMENT NO. 1 TO
                              ------------------
                        PURCHASE AND SALE AGREEMENT AND
                        -------------------------------
                           JOINT ESCROW INSTRUCTIONS
                           -------------------------

          THIS AMENDMENT NO. 1 TO PURCHASE AND SALE AGREEMENT AND JOINT ESCROW
INSTRUCTIONS (this "Amendment") is made and entered into and effective as of
                    ---------
July 20, 2000, by and between KAISER VENTURES INC., a Delaware corporation, and
KAISER STEEL LAND DEVELOPMENT INC., a Delaware corporation (collectively,
"Seller"), and CCG ONTARIO, LLC, a Delaware limited liability company ("Buyer").
 ------                                                                 -----
                                   RECITALS
                                   --------

          A.  WHEREAS, Buyer and Seller have entered into that certain Purchase
and Sale Agreement and Joint Escrow Instructions dated as of July 13, 2000 (the
"Purchase Agreement"); and
 ------------------

          B.  WHEREAS, Buyer and Seller desire to amend the Purchase Agreement,
as more particularly set forth herein.

          NOW, THEREFORE, in consideration of the mutual covenants and
agreements herein contained and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, Buyer and Seller
hereby agree as follows:

                                   AGREEMENT
                                   ---------

     1. Amendments.  The Purchase Agreement is hereby amended as follows:
        ----------

          A. The "Contingency Date" (as defined in Section 1.13 of the Purchase
                  ----------------
Agreement) shall be extended to July 27, 2000.  Seller shall not require Buyer
to deposit any additional funds as a condition to the extension of the
Contingency Date hereunder.

          B. Section 3.1.1.1 of the Purchase Agreement is hereby revised to
read in full as follows:

               3.1.1.1  If on the Contingency Date, the Deed Restriction
               described in Exhibit Y, attached hereto (the "Deed Restriction"),
               the Omnibus Assignment and Assumption Agreement, the CDC
               Guaranty, the Insurance Policies and the IT Contract have not
               been finalized, Buyer shall be entitled to extend the Contingency
               Date to August 4, 2000 and the Closing Date to August 10, 2000,
               by delivering to Seller and Escrow Holder on or before July 27,
               2000 notice of such election and to Escrow Holder Five Hundred
               Thousand Dollars ($500,000) (the "Additional Deposit") in
               immediately available funds provided that, if, by July 27, 2000,
               Seller has not delivered the agreement described in Section
               5.2.17, the easements or indemnity described in Section 5.2.18
               and the consents described in Section 5.2.20, the date for
               posting the Additional Deposit shall be extended to the date two
               business days after Seller has delivered the agreement described
               in Section 5.2.17, the easements or indemnity described in
               Section 5.2.18 and the consents described in Section 5.2.20 and
               provided further that Buyer shall post the Additional Deposit or
               so much thereof as would have been released to Seller
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               under the terms of this Agreement if the Additional Deposit had
               been posted on the date Seller made the deliveries so long as
               Buyer exercised its extension rights hereunder and had not
               terminated this Agreement under Section 4.7 before Seller has
               made the deliveries described above. Upon delivery of the
               Additional Deposit, Escrow Holder shall immediately release Two
               Hundred Fifty Thousand Dollars ($250,000) of the Additional
               Deposit to Seller.

          C. Section 3.1.2 of the Purchase Agreement is hereby revised to read
in full as follows:

               3.1.2 Disposition of Deposit.   In the event this Agreement is
                     ----------------------
               terminated or the Close of Escrow fails to occur by reason of
               Buyer's default hereunder, the Deposit (including all interest
               thereon) shall constitute liquidated damages pursuant to Section
               6.2 below.  In the event this Agreement is terminated or the
               Close of Escrow otherwise fails to occur as a result of a failure
               of a condition precedent described in any of Sections 5.2.2-
               5.2.5, 5.2.7-5.2.9, 5.12.11-5.2.18 or 5.2.20, the Deposit
               (including all interest thereon) shall be returned to Buyer.  If
               this Agreement is terminated or the Close of Escrow otherwise
               fails to occur as a result of a failure of a condition precedent
               described in Sections 5.2.1, 5.2.10 or 5.2.19, only any portion
               of the Deposit (plus interest accrued thereon) not then released
               (or required to be released pursuant to the terms of this
               Agreement) to Seller shall be refundable to Buyer.  Any portion
               of the Deposit released to Seller, once released, (or required to
               be released pursuant to the terms of this Agreement) shall be
               non-refundable to Buyer except in the event of a failure of a
               condition precedent described in any of Sections 5.2.2 - 5.2.5,
               5.2.7-5.2.9, 5.2.11 - 5.2.18 or 5.2.20.  Notwithstanding any
               provision to the contrary contained herein, if the transaction
               described herein fails to close as a result of Seller's material
               default hereunder, the Deposit shall be refunded to Buyer to the
               extent provided for in Section 6.1 hereof.  Upon the Close of
               Escrow, the Deposit (including all interest accrued thereon)
               shall be paid to Seller and shall be credited towards the payment
               of the Purchase Price.

          D. Section 10.3.1 of the Purchase Agreement is hereby to add the
following as a new clause (i): (i) all reasonable costs incurred in connection
with obtaining access for remediation purposes over the Budway Property, the
Rancho Cucamonga Property, the D.T. Sari Property and the Maas Hansen Property
as depicted on Exhibit A-1 attached hereto.

          E. Section 10.3.4 of the Purchase Agreement is hereby revised to read
in full as follows:

               10.3.4  Indemnification by Buyer.  Except only for the Excluded
                       ------------------------
               Liabilities and Losses (as hereinafter defined) arising out of
               Seller's failure to make any payments required of Seller pursuant
               to Section 10.7 hereof, Buyer agrees to assume, indemnify, hold
               harmless and defend Seller and its past, current and future
               affiliates, subsidiaries and each of their officers, directors,
               employees, agents and representatives (collectively, the "Seller
               Parties") from and against any and all Environmental Liabilities
               and Obligations, and from and against any and all liabilities,
               penalties, fines, suits, claims, demands, actions, losses,
               damages, expenses, investigation and remediation costs
               (including, but not limited

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               to, laboratory, handling, transportation, containment,
               neutralization, disposal, capping and other similar costs),
               operation and maintenance costs, financial assurance costs (other
               than costs of Seller's existing financial assurances), Agency
               costs (including, but not limited to, permitting, licensing,
               hazardous waste taxes and oversight costs), causes of action,
               proceedings, judgments, executions and reasonable costs of any
               kind or nature whatsoever (including reasonable attorneys',
               consultants', engineers', experts' and contractors' fees)
               (collectively, "Losses") in connection with, arising out of or
               related to: (a) any Corrective Action; (b) compliance or
               noncompliance with any Requirements; (c) the existence of any
               threat to health, safety or the environment under any Laws, or
               the presence or alleged presence or release of any Hazardous
               Substances on, under, at or from the Real Property or the Tar
               Pits Property; (d) Buyer and ITG's compliance or non compliance
               with any Law; (e) the breach of this Agreement or any Exhibit
               attached hereto and incorporated herein by Buyer except for
               consequential damages incurred by Seller and arising out of such
               breach (as distinct from consequential damages incurred by third
               parties and recovered or recoverable from Seller which third
               party consequential damages shall be recoverable hereunder); (f)
               any breach of the IT Contract or the performance and completion
               bond, as defined in Section 10.4 below and (g) personal injury,
               including death and disability, occurring on or after the Close
               of Escrow caused to employees, contractors, invitees or guests or
               any other persons at or from the Real Property to the extent such
               injury is not related to Hazardous Substances conditions at the
               Real Property or the Adjacent Property; provided, however, that
               this subparagraph (g) of Section 10.3.2 shall not be deemed to
               limit Buyer's assumption and responsibility for any claims
               (whether arising prior to, as of or after the Close of Escrow) as
               provided in this Agreement or in any exhibit hereto related to
               Hazardous Substances conditions that were or are at or from the
               Real Property and/or the Adjacent Property. In addition, except
               for the Excluded Liabilities, Losses arising out of Seller's
               failure to make any payments required of Seller pursuant to
               Section 10.7 hereof, Losses realized by the Seller Parties (or
               any of them) for diminution in value of the Real Property or the
               Adjacent Real Property resulting from the Seller Parties' or any
               of their inability to use the Real Property or the Adjacent Real
               Property for a desired purpose or Losses realized by the Seller
               Parties or any of them pursuant to any contracts or other
               agreements (which Losses shall be assumed and indemnified against
               only to the extent provided for in the Omnibus Assignment and
               Assumption Agreement), Buyer shall assume and indemnify, defend
               and hold the Seller Parties other than any affiliates of Seller
               or any of such affiliates' officers, directors, employees, agents
               and representatives harmless from and against all Losses arising
               out of the presence during Seller's ownership of the Adjacent
               Property of Hazardous Substances in, on or under the Adjacent
               Property in violation of applicable Laws. Any indemnification and
               defense to be provided pursuant to this Section 10.3.4 shall be
               conducted in accordance with the procedures set forth in Section
               14, below. The parties acknowledge that they are continuing to
               negotiate the extent to which Buyer will assume liabilities to
               the MRF and any of the Speedway

                                       3
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               entities for diminution in value claims or claims resulting from
               such entities in ability to use their properties for a desired
               purpose.

          F. Section 10.3.5 is hereby revised to read in its entirety as
follows:

               10.3.5 Seller's Responsibility.  Following the Close of Escrow,
                      -----------------------
               Seller shall refrain from any communications or discussions with
               any Agency or any third party (other than communications or
               discussions relating to the Excluded Liabilities) and from taking
               any other action which could result in any Agency requesting or
               requiring Buyer or the owner of the Real Property, the Tar Pits
               Property or any Adjacent Property to take, perform or cease any
               activity on or with respect to such Real Property, the Tar Pits
               Property or Adjacent Property except communications (which shall
               be made jointly with Buyer) relating to (i) remediation of the
               Tar Pits Property, (ii) elimination of the public hearing
               requirement regarding closure of the Speedway site under the
               Buyer Consent Order and (iii) if not terminated prior to the
               Close of Escrow, termination of the Kaiser Consent Order.  Seller
               and Buyer shall give notice to DTSC and each other Agency with
               which Seller has been in communications within the past twelve
               (12) months regarding the Real Property, the Tar Pits Property
               and/or any Adjacent Property that further communications should
               be addressed to Buyer (although Seller may be copied on such
               notices), and shall so refer any such communications.  Seller
               shall deliver any and all notices and correspondence received
               from any Agency to Buyer within five (5) business days after
               receipt thereof.  Seller acknowledges that the covenants and
               agreements of Seller set forth herein are a material inducement
               to the agreements of Buyer set forth herein.  The provisions of
               this Section 10.3.5 shall not be deemed to prohibit Seller or
               Seller's affiliates from engaging in communications or
               discussions with any Agency with respect to (i) the MRF's
               operations or (ii) the Excluded Liabilities so long as, in each
               event, such communications or discussions do not materially
               impact the corrective Action to be performed by Buyer hereunder.
               Seller shall not be deemed to have engaged in a communication or
               discussion in breach of this Agreement as a result of a material
               impact on the Corrective Action arising out of a communication or
               discussion with an Agency otherwise permitted under clauses (i)
               or (ii), above, if Seller or its applicable affiliate could not
               reasonably have anticipated the material impact and Seller
               provides Buyer with prompt notice of the communication or
               discussion and provides Buyer with an opportunity to participate
               in any follow up communications or discussions.  The provisions
               of this Section 10.3.5 shall be suspended during any period in
               which Buyer is in Default (as hereinafter defined) or if Seller
               takes action to enforce the terms of the performance and
               completion bond or the IT Contract.

          G. Buyer and Seller agree that the term "Environmental Obligations and
Liabilities" shall not include any costs of Seller's existing financial
assurances.

     2. No Other Amendments.  Except as expressly amended hereby, the Purchase
        -------------------
Agreement is unchanged and in full force and effect.

                                       4
<PAGE>

     3. Counterparts. This Amendment may be executed in counterparts, each of
        ------------
which shall be an original and all of which taken together shall constitute the
same instrument.

                           [SIGNATURES ON NEXT PAGE]
                            -----------------------

                                       5
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed this Amendment as
of the dates written below.

Buyer:                                CCG ONTARIO, LLC,
-----
                                      a Delaware limited liability company

                                      By:  Catellus Commercial Group, LLC,
                                           a Delaware limited liability company,
                                           Its sole member

                                           By: /s/ Charles A. McPhee
                                               ----------------------------
                                           Name: Charles A. McPhee
                                           Its: Senior Vice President

Date Executed: July 26, 2000
               -------------

Seller:                               KAISER VENTURES INC.,
------
                                      a Delaware corporation

                                      By: /s/ Terry L. Cook
                                          ---------------------------------
                                      Name: Terry L. Cook
                                            -------------------------------
                                      Its: Executive Vice President -
                                           --------------------------------
                                           General Counsel
                                           --------------------------------

Date Executed: July 26, 2000
               -------------

                                      KAISER STEEL LAND DEVELOPMENT INC.,
                                      a Delaware corporation

                                      By: /s/ Terry L. Cook
                                          ---------------------------------
                                      Name: Terry L. Cook
                                            -------------------------------
                                      Its: Vice President - General Counsel
                                           --------------------------------

Date Executed: July 26, 2000
               --------------

                                       6
<PAGE>

RECEIVED AND ACCEPTED THIS ____ DAY OF ________, 2000.

ESCROW HOLDER:
CHICAGO TITLE INSURANCE COMPANY

By: __________________________
Name: ________________________
Its: _________________________

                                       7<PAGE>

                                                                  EXHIBIT 10.1.2
                                                                  ==============

                              AMENDMENT NO. 2 TO
                              ------------------
                        PURCHASE AND SALE AGREEMENT AND
                        -------------------------------
                           JOINT ESCROW INSTRUCTIONS
                           -------------------------

          THIS AMENDMENT NO. 2 TO PURCHASE AND SALE AGREEMENT AND JOINT ESCROW
INSTRUCTIONS (this "Amendment") is made and entered into and effective as of
                    ---------
July 27, 2000, by and between KAISER VENTURES INC., a Delaware corporation, and
KAISER STEEL LAND DEVELOPMENT INC., a Delaware corporation (collectively,
"Seller"), and CCG ONTARIO, LLC, a Delaware limited liability company ("Buyer").
 ------                                                                 -----

                                   RECITALS
                                   --------

          A.  WHEREAS, Buyer and Seller have entered into that certain Purchase
and Sale Agreement and Joint Escrow Instructions dated as of July 13, 2000, as
amended by that certain Amendment No. 1 to Purchase and Sale Agreement and Joint
Escrow Instructions dated as of July 20, 2000 (as amended, the "Purchase
                                                                --------
Agreement"); and
----------

          B.  WHEREAS, Buyer and Seller desire to amend the Purchase Agreement,
as more particularly set forth herein.

          NOW, THEREFORE, in consideration of the mutual covenants and
agreements herein contained and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, Buyer and Seller
hereby agree as follows:

                                   AGREEMENT
                                   ---------

     1. Amendments.  The Purchase Agreement is hereby amended as follows:
        ----------

          A.  The "Contingency Date" (as defined in Section 1.13 of the Purchase
              -----------------
Agreement) is extended to August 4, 2000.

          B.  The "Closing Date" (as defined in Section 1.12 of the Purchase
                   ------------
Agreement) is extended to August 10, 2000.

          C.  Section 3.1 of the Purchase Agreement is hereby revised to read in
full as follows:

          3.1  Deposit.
               -------

               3.1.1  Delivery by Buyer.  Buyer has delivered the Deposit to
                      -----------------
          Seller.  On July 27, 2000, Buyer shall deliver $500,000 (the
          "Additional Deposit") in immediately available funds to Escrow Holder.
          The Additional Deposit shall be held by Escrow Holder until released
          in accordance with the provisions hereof.

               3.1.1.1.  If on the Contingency Date, the Deed Restriction
               described in Exhibit Y, attached hereto (the "Deed Restriction"),
               the Omnibus Assignment and Assumption Agreement, the CDC
               Guaranty, the Insurance Policies and the IT

                                       1
<PAGE>

               Contract have not been finalized, Buyer shall be entitled to
               extend the Contingency Date to August 11, 2000 and the Closing
               Date to August 14, 2000, by delivering to Seller and Escrow
               Holder on or before the August 4, 2000 notice of such election
               and causing Escrow Holder to release to Seller the amount of
               $250,000 from the Additional Deposit on or before August 4, 2000;
               provided that, if, by August 4, 2000, Seller has not delivered
               the agreement described in Section 5.2.17, the easements or
               indemnity described in Section 5.2.18 and the consents described
               in Section 5.2.20, the date for release of the initial $250,000
               of the Additional Deposit to Seller shall be extended to the date
               when Seller has delivered the agreement described in Section
               5.2.17, the easements or indemnity described in Section 5.2.18
               and the consents described in Section 5.2.20 so long as Buyer has
               not terminated this Agreement under Section 4.7 before Seller has
               made the deliveries described above.

               3.1.1.2  If Buyer has extended the Contingency Date under Section
               3.1.1.1 and the Deed Restriction, Omnibus Assignment and
               Assumption Agreement, the CDC Guaranty, the Insurance Policies
               and the IT Contract have not been finalized by August 11, 2000,
               Buyer shall be entitled to extend the Contingency Date to
               September 11, 2000 and the Closing Date to September 15, 2000 by
               delivering to Seller and Escrow Holder on or before August 11,
               2000 notice of such election and causing Escrow Holder to release
               to Seller the remainder of the Additional Deposit if any portion
               of the Additional Deposit has then been released to Seller under
               3.1.1.1 or, if the none of the Additional Deposit has then been
               released to Seller under 3.1.1.1, by causing Escrow Holder to
               release the remainder of the Additional Deposit when the
               Additional Deposit or any portion thereof is to be released to
               Seller under Section 3.1.1.1.  If Buyer exercises its right to
               extend the Contingency Date and Closing Date under this Section
               3.1.1.2, Buyer shall also deliver to Escrow Holder on or before
               August 14, 2000 immediately available funds in the amount of One
               Million Thousand Dollars ($1,000,000) (the "Final Deposit")
               provided that, if, by August 14, 2000 Seller has not delivered
               the agreement described in Section 5.2.17, the easements or
               indemnity described in Section 5.2.18 and the consents described
               in Section 5.2.20, the date for posting the Final Deposit shall
               be extended to the date two business days after Seller has
               delivered the agreement described in Section 5.2.17, the
               easements or indemnity described in Section 5.2.18 and the
               consents described in Section 5.2.20 and provided further that
               Buyer shall be required to post the Final Deposit if Buyer
               exercised its extension rights hereunder and has not terminated
               this Agreement under Section 4.7 before Seller has made the
               deliveries described above.  Upon delivery of the Final Deposit,
               Escrow Holder shall immediately release the Final Deposit to
               Seller.

               3.1.1.3.  Seller shall be entitled to extend the Closing Date
               pursuant to Section 5.1.

     2. No Other Amendments.  Except as expressly amended hereby, the Purchase
        -------------------
Agreement is unchanged and in full force and effect.

                                       2
<PAGE>

     3. Counterparts. This Amendment may be executed in counterparts, each of
        ------------
which shall be an original and all of which taken together shall constitute the
same instrument.

                           [SIGNATURES ON NEXT PAGE]
                            -----------------------

                                       3
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed this Amendment as
of the dates written below.

Buyer:                        CCG ONTARIO, LLC,
-----
                              a Delaware limited liability company

                              By:  Catellus Commercial Group, LLC,
                                   a Delaware limited liability company,
                                   Its sole member

                                   By: /s/ Charles A. McPhee
                                       ---------------------
                                   Name: Charles A. McPhee
                                   Its: Senior Vice President

Date Executed: July 27, 2000
               -------------

Seller:                       KAISER VENTURES INC.,
------
                              a Delaware corporation

                              By: /s/ Terry L. Cook
                                  -----------------
                              Name: Terry L. Cook
                                    ---------------
                              Its: Executive Vice President - General Counsel
                                   ------------------------------------------

Date Executed: July 27, 2000
               -------------

                              KAISER STEEL LAND DEVELOPMENT INC.,
                              a Delaware corporation

                              By: /s/ Terry L. Cook
                                  -----------------
                              Name: Terry L. Cook
                                    ---------------
                              Its: Vice President - General Counsel
                                   --------------------------------

Date Executed: July 27, 2000
               -------------

                                      S-1
<PAGE>

RECEIVED AND ACCEPTED THIS ____ DAY OF _________, 2000.

ESCROW HOLDER:
CHICAGO TITLE INSURANCE COMPANY

By:___________________________
Name: ________________________
Its:__________________________

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