Document:

<PAGE>

                                                                 EXHIBIT 4.16

                    THIRD AMENDMENT TO REIMBURSEMENT AGREEMENT

              This THIRD AMENDMENT TO REIMBURSEMENT AGREEMENT (this
"Amendment"), dated as of June 30, 1999, by and among HILTON HOTELS
CORPORATION, a Delaware corporation (the "Company"), DEUTSCHE BANK AG, NEW
YORK BRANCH, as issuer of the Letter of Credit (in such capacity, the
"Issuer"); DEUTSCHE BANK AG, NEW YORK BRANCH AS SUCCESSOR TO DEUTSCHE BANK
AG, LOS ANGELES BRANCH, THE BANK OF NEW YORK, SOCIETE GENERALE, CIBC INC.,
AND BANCA NATIONALE DEL LAVORO (herein collectively, the "Existing Banks" and
individually an "Existing Bank"); and DEUTSCHE BANK AG, NEW YORK BRANCH, as
agent (in such capacity, the "Agent") and each of the Banks listed on
Schedule A hereto (each, a "New Bank" and, collectively, the "New Banks").
Unless otherwise expressly defined herein, any capitalized term used herein
and defined in the Reimbursement Agreement (as defined below) shall have the
meaning assigned to it in the Reimbursement Agreement.

                                 WITNESSETH:

              WHEREAS, the Issuer has issued that certain letter of credit
No. 839-53762, dated May 16, 1996 (the "Letter of Credit"), pursuant to that
certain reimbursement agreement, dated as of May 16, 1996, as amended by a
First Amendment to Reimbursement Agreement, dated as of December 17, 1996, as
further amended by a Second Amendment to Reimbursement Agreement, dated as of
May 1, 1998, and as further amended by that certain Letter Agreement, dated
May 10, 1999 (collectively, the "Original Reimbursement Agreement"; as
amended from time to time, including by this Agreement, the "Reimbursement
Agreement"), by and between the Company, the Agent, the Issuer and the Banks;

              WHEREAS, the Company, the Issuer, the Agent and the Banks each
desire to amend the Original Reimbursement Agreement in the manner and
pursuant to the terms and conditions set forth herein;

              NOW, THEREFORE, in consideration of the promises made hereunder
by the Company, this Issuer, the Agent and the Banks, and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto, intending to be legally bound, hereby agree
as follows:

              1.     ASSIGNMENT AND ASSUMPTION.

              1.1.  ASSIGNMENT AND ASSUMPTION. Each Existing Bank hereby
sells and assigns to each New Bank without recourse and without
representation or warranty (other than as expressly provided herein), and
each New Bank hereby purchases and assumes from each Existing Bank,

<PAGE>

that interest in and to each Existing Bank's rights and obligations in
respect of the Letter of Credit Commitment, the Risk Participation and the
Loans set forth on Schedule A hereto under the Reimbursement Agreement as of
the date hereof which for each such New Bank represents such New Bank's
Letter of Credit Commitment as set forth on such Schedule A (calculated after
giving effect to this Amendment), and represents all of the outstanding
rights and obligations under the Reimbursement Agreement that are being sold
and assigned to each such New Bank pursuant to this Amendment.

              1.2.   EFFECTIVENESS. In accordance with the requirements of
Section 11.04(c) of the Reimbursement Agreement, on the Third Amendment
Effective Date (as defined below), each New Bank shall be a "Bank" party to
the Reimbursement Agreement and shall have all of the rights and obligations
of a Bank with a Letter of Credit Commitment as set forth in such Schedule A
and each Existing Bank shall be released from its obligations thereunder to a
corresponding extent and no further consent or action by any party shall be
required. The provisions of Section 11.04(d) shall not be applicable to the
New Banks.

              1.3.   REPRESENTATION AND WARRANTIES. Each Existing Bank (i)
represents and warrants that it is the legal and beneficial owner of the
interest being assigned by it hereunder and that such interest is free and
clear of any adverse claim; (ii) makes no representation or warranty and
assumes no responsibility with respect to any statements, warranties or
representations made in or in connection with the Reimbursement Agreement or
the Related Documents or the execution, legality, validity, enforceability,
genuineness, sufficiency or value of the Reimbursement Agreement or the
Related Documents or any other instrument or document furnished pursuant
thereto; and (iii) makes no representation or warranty and assumes no
responsibility with respect to the financial condition of the Company or the
performance or observance by the Company of any of their respective obligations
under the Reimbursement Agreement or the Related Documents to which they are
a party or any other instrument or document furnished pursuant thereto.

              1.4.   CONFIRMATION. Each New Bank (i) confirms that it has
received a copy of the Reimbursement Agreement, together with such other
documents and information as it has deemed appropriate to make its own credit
analysis and decision to enter into this Amendment; (ii) agrees that it will,
independently and without reliance upon the Agent, or any other New Bank and
based on such documents and information as it shall deem appropriate at the
time, continue to make its own credit decisions in taking or not taking
action under the Reimbursement Agreement; (iii) appoints and authorizes the
Agent and the Collateral Agent to take such action as agent on its behalf and
to exercise such powers under the Reimbursement Agreement and Related
Documents as are delegated to the Agent and the Collateral Agent by the terms
thereof, together with such powers as are reasonably incidental thereto; and
(iv) agrees that it will perform in accordance with their terms all of the
obligations which by the terms of the Reimbursement Agreement are required to
be performed by it as a Bank.

              2.     AMENDMENTS TO REIMBURSEMENT AGREEMENT.

                                     -2-

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              2.1    CONSENTS. The Company, the Issuer, the Agent and each of
the New Banks executing this Agreement hereby consent to the following
amendments to the Reimbursement Agreement on the terms and subject to the
conditions set forth herein.

              2.2    DEFINITIONS.

              2.2.1  The following definitions are hereby added to the
Reimbursement Agreement:

              "PARK PLACE" means Park Place Entertainment Corporation, a
       Delaware corporation, and immediately prior to the Spin-Off, a Subsidiary
       holding the assets of the Borrower's Gaming Segment.

              "PPE ASSUMED NOTES" means the Borrower's $300,000,000 7.375%
       Notes Due 2002 and $325,000,000 7.00% Notes Due 2004.

              "SPIN-OFF" means (A) the transfer to Park Place of all or
       substantially all of the assets of the Borrower and its Subsidiaries
       comprising the Borrower's Gaming Segment and (B) the distribution by
       the Borrower to its stockholders of all capital stock of Park Place held
       by the Borrower.

              "YEAR 2000 ISSUE" means failure of computer software, hardware and
       firmware systems, and equipment containing embedded computer chips, to
       properly receive, transmit, process, manipulate, store, retrieve,
       re-transmit or in any other way utilize data and information due to the
       occurrence of the year 2000 or the inclusion of dates on or after
       January 1, 2000.

              2.2.2  The definition of Consolidated Debt is amended by the
       addition of the following proviso:

              ;PROVIDED that Consolidated Debt shall exclude: (A) the PPE
       Assumed Notes on the conditions that (i) such Debt shall have been
       assumed by Park Place on terms such that as between the Borrower and
       Park Place, Park Place is obligated to make payments of principal and
       interest on such Debt, and to reimburse the Borrower for any such
       payment made by the Borrower and (ii) the Spin-Off shall have occurred,
       and (B) Debt of the Borrower or a Subsidiary as to which a sum of cash
       and cash equivalents sufficient to provide for payment in full of such
       Debt at its scheduled maturity or at an earlier date at which it shall
       have been called for redemption shall have been irrevocably deposited in
       trust for the benefit of the holders of such Debt or a representative of
       such holders so as to result in legal or in-substance defeasance
       thereof; PROVIDED, FURTHER, that, notwithstanding clause (A) in the
       foregoing proviso, if Park Place fails to pay when due any principal of
       or interest on or any other amount with respect to the PPE Assumed Notes
       or reimburse the Borrower for payment thereof, and such failure is
       continuing, on and after the 90th day after such payment default first
       occurs any of the PPE Assumed Notes then outstanding shall be included in
       Consolidated Debt, unless such Debt then would be excluded therefrom
       pursuant to clause (B) in the foregoing proviso.

                                       -3-
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              2.2.3  The definition of Consolidated EBITDA is amended by the
addition of the following proviso:

              ;PROVIDED that Consolidated EBITDA for any period shall be
       adjusted on a pro forma bases (i) to include (or exclude) amounts
       attributable to hotel operations acquired (or sold or otherwise
       discontinued) during such period as if such acquisition (or
       disposition) had occurred on the first day of such period and (ii) to
       include amounts (annualized on a simply arithmetic basis) attributable
       to hotel projects which commenced operations during such period and were
       in operation for at least one full fiscal quarter during such period;
       PROVIDED, FURTHER, that for purposes of determining Consolidated EBITDA
       for any period, Consolidated Net Income shall exclude any interest
       income attributable to the assumption or payment by Park Place of the PPE
       Assumed Notes.

              2.3    OTHER AMENDMENTS.

              2.3.1  SECTION 7.10. Section 7.10 is hereby deleted in its
entirety and amended in full to read as follows:

              "Section 7.10. LEVERAGE RATIO. The Leverage Ratio will at no
       time exceed 4.5:1."

              2.3.2  SECTION 7.14. The following section is hereby added to the
       Reimbursement Agreement:

              Section 7.14. YEAR 2000. The Company shall make, and shall cause
       each of its Subsidiaries to make, all required systems changes by
       December 31, 1999, in computer software, hardware and firmware systems
       and equipment containing embedded microchips owned or operated by or
       for the Company and its Subsidiaries required as a result of the Year
       2000 Issue to permit the proper functioning of such computer systems
       and other equipment, except to the extent that the failure to take any
       such action could not reasonably be expected to result in a Default or
       to have a material adverse effect on the business, financial position,
       results of operations or prospects of the Company and its Consolidated
       Subsidiaries, considered as a whole. At the request of any Bank, the
       Company shall provide, and shall cause each of its Subsidiaries to
       provide, to such Bank reasonable assurance of its compliance with the
       preceding sentence.

              2.3.3  PRICING SCHEDULE. The Pricing Schedule attached as
Exhibit A to the first Amendment to Reimbursement Agreement, dated as of
December 17, 1996 is hereby deleted in its entirety and the Pricing Schedule
attached to the Agreement as Exhibit A is hereby incorporated into the
Reimbursement Agreement by this reference as if originally set forth in full
therein.

              3. EXTENSION OF SCHEDULED EXPIRATION DATE.

              3.1    EXTENSION. In accordance with Section 2.01 of the
Reimbursement Agreement, on and as of the Third Amendment Effective Date the
Scheduled Expiration Date, which was extended to July 15, 1999 by that certain
letter agreement dated May 10, 1999, shall be further extended to October 18,
2001. The notice requirement of Section 2.01 is hereby waived in respect of
this extension.

                                      -4-

<PAGE>

              3.2.   NOTIFICATION. The second sentence of Section 2.01 is
hereby deleted in its entirety and amended in full to read as follows:

       Upon the receipt of a written request of the Company given
       to the Agent not more than sixty (60) days nor less than
       forty-five (45) days prior to any Scheduled Expiration Date
       and upon the receipt of the written approval of all of the
       Banks, the Issuer may elect, at its sole option, to extend the
       Scheduled Expiration Date for one additional year or for such
       longer or shorter period as all the Banks may agree.

              4.     REPRESENTATIONS AND WARRANTIES. The Company represents
and warrants to the Issuer, the Agent and the Banks as follows:

              4.1    AUTHORITY. The Company has all necessary power and has
taken all corporate action necessary to make this Agreement and all other
agreements and instruments executed in connection herewith the legal, valid
and binding obligations they purport to be.

              4.2    NO LEGAL OBSTACLE TO AGREEMENT. The execution of this
Agreement has not constituted or resulted in and will not constitute or
result in a breach  of any provision of any contract to which the Company is
a party, or the violation of any law, judgment, decree or governmental order,
rule or regulation applicable to, or result in the creation under any
agreement or instrument of any security interest, lien, charge or
encumbrance upon any of the assets of, the Company, except in favor of the
Agent and the Banks or as permitted by the Reimbursement Agreement. No
approval or authorization of any governmental authority is required to permit
the execution, delivery or performance of this Agreement, or the transactions
contemplated hereby or thereby.

              4.3    INCORPORATION OF CERTAIN REPRESENTATIONS AND WARRANTIES.
The representations and warranties set forth in Article VI of the
Reimbursement Agreement are true and correct in all respects on and as of the
date hereof, as through made on and as of the date hereof, except to the extent
that such representations and warranties expressly relate to an earlier
date.

              4.4    DEFAULT. Upon this Agreement becoming effective pursuant
to Section 5.1 hereof, no Default or Event of Default has occurred and is
continuing. The parties agree that the Spin-Off does not give rise to a
Default under Section 7.04 or Section 7.08.

              4.5    LOANS. Upon this Agreement becoming effective pursuant
to Section 5.1 hereof there are no Loans outstanding under the Reimbursement
Agreement.

              4.6    FINANCIAL INFORMATION. (a) The consolidated balance
sheet of the Company and its Consolidated Subsidiaries as of December 31,
1998 and the related consolidated statements of income and cash flows for the
fiscal year then ended, reported on by __________________ and set forth in
the Company's 1998 Form 10-K, a copy of which has been delivered to the Agent,
the Issuer and each of the Banks, fairly present in all material respects, in

                                     -5-

<PAGE>
conformity with GAAP, the consolidated financial position of the Company and
is Consolidated Subsidiaries as of such date and their consolidated results
of operations and cash flows for such fiscal year.

              (b)    The unaudited consolidated balance sheet of the Company
and its Consolidated Subsidiaries as of March 31, 1999 and the related
unaudited consolidated statements of income and cash flows for the three
months then ended, set forth in the Company's quarterly report for the fiscal
quarter ended March 31, 1999 as filed with the Securities and Exchange
Commission on Form 10-Q, a copy of which has been delivered to the Agent, the
Issuer and each of the Banks, fairly present, in conformity with GAAP applied
on a basis consistent with the Company's quarterly report for the fiscal
quarter ended March 31, 1999, the consolidated financial position of the
Company and its Consolidated Subsidiaries as of such date and their
consolidated results of operations and cash flows for such three-month period
(subject to normal year-end adjustments).

              4.7    YEAR 2000. The Company and its Subsidiaries have
reviewed the effect of the Year 2000 issue on the computer software, hardware
and firmware systems and equipment contained embedded microchips owned or
operated by or for the Company and its Subsidiaries. The costs to the Company
and its Subsidiaries of any reprogramming required as a result of the Year 2000
Issue to permit the proper functioning of such systems and equipment and the
proper processing of data, and the testing of such reprogramming, and of
required systems changes are not reasonably expected to result in a Default
or to have a material adverse effect on the business, financial position,
results of operations or prospects of the Company and its Consolidated
Subsidiaries, considered as a whole.

              5.     MISCELLANEOUS.

              5.1    EFFECTIVE DATE. This Amendment shall become effective
on the date (the "Third Amendment Effective Date") when the Company, the
Agent, the Issuer, each Existing Bank and each New Bank shall have signed a
counterpart hereof (whether the same or different counterparts) and shall have
delivered (including by way of facsimile transmission) the same to the Agent.

              5.2    EFFECT OF AGREEMENT ON REIMBURSEMENT. Except as affected
hereby, the Reimbursement Agreement, the other Related Documents and any and
all other agreements, documents, certificates and other instruments executed
in connection therewith, shall remain in full force and effect in accordance
with their respective terms. Except as otherwise provided herein, the
Reimbursement Agreement, the other Related Documents and any and all other
agreements, documents, certificates and other instruments executed in
connection therewith, are in all respects ratified and confirmed, and nothing
contained in this Agreement shall, or shall be construed to, modify,
invalidate or otherwise affect any provision of such agreements, documents,
certificates and instruments or any right of the parties thereto.

              5.3    COUNTERPARTS. This Amendment may be executed in any
number of counterparts and by the different parties hereto on separate
counterparts, each of which counterparts when executed and delivered shall be
an original, but all of which shall together

                                 -6-

<PAGE>

constitute one and they same instrument. A complete set of counterparts shall be
lodged with the Company and the Agent.

              5.4    GOVERNING LAW. THIS AMENDMENT AND THE RIGHTS AND
OBLIGATIONS OF THE PARTIES HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE WITH
AND GOVERNED BY THE LAW OF THE STATE OF NEW YORK.

              5.5    REFERENCE. From and after the Second Amendment Effective
Date, all references in the Reimbursement Agreement and each of the Related
Documents to the Reimbursement Agreement shall be deemed to be references to
the Reimbursement Agreement as amended hereby.

                               *       *       *

                                      -7-

<PAGE>

              IN WITNESS WHEREOF, the parties hereto have caused this
Agreement to be duly executed and delivered by their respective duly
authorized officers as of the date first above written.

                              THE COMPANY

                              HILTON HOTELS CORPORATION

                              By  /s/ Mariel Albrecht
                                ------------------------------------------------
                                Title:

                              Hilton Hotels Corporation
                              9336 Civic Center Drive
                              Beverly Hills, CA 90210
                              Attention: Mariel Albrecht
                                         Vice President and Assistant Treasurer
                              Tel:       (310) 205-4331
                              Fax:       (310) 205-7849

                              THE AGENT

                              DEUTSCHE BANK AG, NEW YORK BRANCH, as
                                Agent

                              By
                                ----------------------------------------------
                                Title:

                              By
                                ----------------------------------------------
                                Title:

                              Deutsche Bank AG, New York Branch
                              31 West 52nd Street
                              New York, New York 10019
                              Attention: Inken Finnamore
                              Tel:       (212) 469-8348
                              Fax:       (212) 469-8501

                                      -8-

<PAGE>

                              THE ISSUER

                              DEUTSCHE BANK AG, NEW YORK BRANCH, as
                                Issuer of the Letter of Credit

                              By
                                ----------------------------------------------
                                Title:

                              By
                                ----------------------------------------------
                                Title:

                              Deutsche Bank AG, New York Branch
                              31 West 52nd Street
                              New York, New York 10019
                              Attention: Volker Fischer
                                         Trade Finance
                              Tel:       (212) 469-8636
                              Fax:       (212) 469-7880

                                      -9-

<PAGE>

                              THE EXISTING BANKS

                              DEUTSCHE BANK AG, NEW YORK BRANCH, AS
                                SUCCESSOR TO DEUTSCHE BANK AG, LOS
                                ANGELES BRANCH

                              By
                                ----------------------------------------------
                                Title:

                              By
                                ----------------------------------------------
                                Title:

                              Deutsche Bank AG, New York Branch, as Successor to
                               Deutsche Bank AG, Los Angeles Branch
                              31 West 52nd Street
                              New York, New York 10019
                              Attention: Thomas Foley
                                         Vice President
                              Tel:       (212) 469-8636
                              Fax:       (212) 469-7880

                              THE BANK OF NEW YORK

                              By
                                ----------------------------------------------
                                Title:

                              The Bank of New York
                              10990 Wilshire Boulevard
                              Suite 1125
                              Los Angeles, California 90024
                              Attention: Lisa Brown
                              Tel:       (310) 996-8656
                              Fax:       (310) 996-8667

                                        -10-

<PAGE>

                              SOCIETE GENERALE

                              By
                                ----------------------------------------------
                                Title:

                              Societe Generale
                              2029 Century Park East
                              Suite 2900
                              Los Angeles, California 90067
                              Attention: Alex Kim
                              Tel:       (310) 788-7104
                              Fax:       (310) 551-1537

                              CIBC, INC.

                              By
                                ----------------------------------------------
                                Title:

                              CIBC Inc.
                              350 South Grand Avenue
                              Suite 2600
                              Los Angeles, California 90071
                              Attention: Dean Decker
                              Tel:       (213) 617-6245
                              Fax:       (213) 346-0157

                              BANCA NAZIONALE DEL LAVORO

                              By
                                ----------------------------------------------
                                Title:

                              BANCA NAZIONALE DEL LAVORO
                              25 West 51st Street
                              New York, NY 10019
                              Attention: Adolph Mascari
                              Tel:       (212) 314-0207
                              Fax:       (212) 765-2978

                                       -11-

<PAGE>

                              THE NEW BANKS

                              DEUTSCHE BANK AG, NEW YORK BRANCH, AS
                                SUCCESSOR TO DEUTSCHE BANK AG, LOS
                                ANGELES BRANCH

                              By
                                ----------------------------------------------
                                Title:

                              By
                                ----------------------------------------------
                                Title:

                              Deutsche Bank AG, New York Branch, as Successor to
                               Deutsche Bank AG, Los Angeles Branch
                              31 West 52nd Street
                              New York, New York 10019
                              Attention: Thomas Foley
                                         Vice President
                              Tel:       (212) 469-8636
                              Fax:       (212) 469-7880

                              CITICORP USA, INC.

                              By
                                ----------------------------------------------
                                Title:

                              Citicorp USA, Inc.
                              787 West 5th Street
                              29th Floor
                              Los Angeles, California 90071
                              Attention: Walter L. Larsen
                                         Managing Director
                              Tel:       (213) 239-1501
                              Fax:       (213) 624-9765

                                     -12-

<PAGE>

                              THE BANK OF NEW YORK

                              By
                                ----------------------------------------------
                                Title:

                              The Bank of New York
                              10990 Wilshire Boulevard
                              Suite 1125
                              Los Angeles, California 90024
                              Attention: Lisa Brown
                              Tel:       (310) 996-8656
                              Fax:       (310) 996-8667

                              SOCIETE GENERALE

                              By
                                ----------------------------------------------
                                Title:

                              Societe Generale
                              2029 Century Park East
                              Suite 2900
                              Los Angeles, California 90067
                              Attention: Alex Kim
                              Tel:       (310) 788-7104
                              Fax:       (310) 551-1537

                                       -13-<PAGE>

                                                                 EXHIBIT 4.17

                  FOURTH AMENDMENT TO REIMBURSEMENT AGREEMENT

               This FOURTH AMENDMENT TO REIMBURSEMENT AGREEMENT (this
"Amendment"), dated as of November 30, 1999, by and among HILTON HOTELS
CORPORATION, a Delaware corporation (the "Company"), DEUTSCHE BANK AG, NEW
YORK BRANCH, as issuer of the Letter of Credit (in such capacity, the
"Issuer"); DEUTSCHE BANK AG, NEW YORK BRANCH AS SUCCESSOR TO DEUTSCHE BANK AG,
LOS ANGELES BRANCH, THE BANK OF NEW YORK, SOCIETE GENERALE, CITICORP USA,
INC. (herein collectively, the "Banks" and individually a "Bank"); and
DEUTSCHE BANK AG, NEW YORK BRANCH, as agent (in such capacity, the "Agent").
Unless otherwise expressly defined herein, any capitalized term used herein
and defined in the Reimbursement Agreement (as defined below) shall have the
meaning assigned to it in the Reimbursement Agreement.

                                WITNESSETH:

              WHEREAS, the Issuer has issued that certain letter of credit
No. 839-53762, dated May 16, 1996 (the "Letter of Credit"), pursuant to that
certain reimbursement agreement, dated as of May 16, 1996, as amended by a
First Amendment to Reimbursement Agreement, dated as of December 17, 1996, as
further amended by a Second Amendment to Reimbursement Agreement, dated as of
May 1, 1998, as further amended by that certain Letter Agreement, dated May
10, 1999, and as further amended by a Third Amendment to Reimbursement
Agreement, dated as of June 30, 1999 (collectively, the "Original
Reimbursement Agreement"; as amended from time to time, including by this
Agreement, the "Reimbursement Agreement"), by and between the Company, the
Agent, the Issuer and the Banks;

              WHEREAS, the Company, the Issuer, the Agent and the Banks each
desire to amend the Original Reimbursement Agreement in the manner and
pursuant to the terms and conditions set forth herein;

              NOW, THEREFORE, in consideration of the promises made
hereunder by the Company, the Issuer, the Agent and the Banks, and for other
good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto, intending to be legally bound,
hereby agree as follows:

              1.     AMENDMENTS TO REIMBURSEMENT AGREEMENT.

              1.1.   CONSENTS.  The Company, the Issuer, the Agent and each
of the Banks executing this Agreement hereby consent to the following
amendments to the Reimbursement Agreement on the terms and subject to the
conditions set forth herein.

<PAGE>

              1.2    DEFINITIONS.

              1.2.1  AMENDMENT TO CERTAIN EXISTING DEFINED TERMS.  The
following terms defined in the Reimbursement Agreement are hereby amended in
full to read as follows:

              "Consolidated EBITDA" means, for any period, Consolidated Net
Income for such period before (i) income taxes, (ii) interest expense, (iii)
depreciation and amortization, (iv) minority interest, (v) extraordinary
loses or gains, (vi) Pre-Opening Expenses, (vii) transactional expenses
associated with the Spin-Off and the Promus Acquisition, (viii) discontinued
operations and (ix) nonrecurring non-cash charges; PROVIDED that:

                     (a) Consolidated EBITDA for my period shall be adjusted
              on a pro forma basis (i) to include (or exclude) amounts
              attributable to hotel operations acquired (or sold or otherwise
              discontinued) during such period as if such acquisition (or
              disposition) had occurred on the first day of such period and (ii)
              to include amounts (annualized on a simple arithmetic basis)
              attributable to hotel projects which commenced operations during
              such period and were in operation for at least one full fiscal
              quarter during such period;

                     (b) for purposes of determining Consolidated EBITDA for
              any period, Consolidated Net Income shall exclude any interest
              income attributable to the assumption or payment by Park Place
              of the PPE Assumed Notes;

                     (c) in calculating "Consolidated EBITDA" for that portion
              of any period occurring prior to the Fourth Amendment Effective
              Date, "Consolidated EBITDA" shall be computed on the basis of the
              combined operating results of the Company, Promus and their
              respective Consolidated Subsidiaries for such periods reflected
              in the Pro Forma Combined Financial Statements; and

                     (d) the operating results of each New Project which
              commences operations and records not less than one full fiscal
              quarter's operations during the relevant period shall be
              annualized on a simple arithmetic basis.

              "Consolidated Net Income" means, for any period, the
consolidated net income of the Company and its Consolidated Subsidiaries for
such period, PROVIDED that for that portion of any period occurring prior to
the Fourth Amendment Effective Date, such consolidated net income shall be
the pro forma combined net income of the Company, Promus and their respective
Consolidated Subsidiaries for such periods reflected in the Pro Forma
Combined Financial Statements PLUS the Pro Forma Adjustments applicable to
that portion of such period.

              1.2.2  ADDITIONAL DEFINED TERMS.  The following definitions
are hereby added to the Reimbursement Agreement:

              "Consolidated Interest Expense" means, for any period net
interest expense of the Company and its Consolidated Subsidiaries for such
period, determined in accordance with generally accepted accounting
principles, PROVIDED that for that portion of any period occurring prior to
the Fourth Amendment Effective Date, "Consolidated Interest Expense" shall be

                                      -2-

<PAGE>

computed on the basis of the net interest expense allocated to the Company
and its Consolidated Subsidiaries and shown on the Pro Forma Combined
Financial Statements.

              "Gaming Segment" means the former gaming segment (as "segment"
is used in Regulation S-K and Regulation S-X of the Securities and Exchange
Commission) of the Company which, prior to December 31, 1998, was comprised
of assets and operations now principally owned and conducted by Park Place.

              "Investment Grade" means (i) with respect to S&P, a rating of
BBB- or higher and (ii) with respect to Moody's, a rating of Baa3 or higher.

              "New Project" means each now hotel or resort project (as
opposed to any project which consists of an extension or redevelopment of an
operating hotel or resort) having a development and construction budget in
excess of $50,000,000 which receives a certificate of completion or
occupancy and all relevant operational licenses, and in fact commences
operations after November 30, 1999.

              "Pre-Opening Expenses" means, with respect to any fiscal
period, the amount of expenses (other than Consolidated Interest Expense)
incurred with respect to capital projects which are classified as
"pre-opening expenses" on the applicable financial statements of the Company
and its Consolidated Subsidiaries for such period (or, with respect to that
portion of any period occurring prior to September 30, 1999, the Pro Forma
Combined Financial Statements), prepared in accordance with generally
accepted accounting principles.

              "Pricing Certificate" means a Pricing Certificate,
substantially in the form of Exhibit B hereto, properly completed and signed
by an Authorized Officer.

              "Pro Forma Adjustment" means an adjustment to the amount of
Consolidated Net Income set forth in the Pro Forma Combined Financial
Statements for the period prior to the Fourth Amendment Effective Date
reflecting anticipated synergies from the Promus Acquisition (on a pro forma
combined basis) equal in each fiscal period set forth below to the amount set
forth opposite that fiscal period:

<TABLE>
<CAPTION>
           Fiscal Period                           Pro Forma Adjustment
           -------------                           --------------------
           <S>                                     <C>
           January 1 through March 31, 1999        $10,000,000
           April 1 through June 30, 1999           $10,000,000
           July 1 through September 30, 1999       $10,000,000
           October 1 through December 31, 1999     $ 9,500,000
</TABLE>

              "Pro Forma Combined Financial Statements" means (a) from
November 30, 1999 until the Company delivers the pro forma combined financial
statements described in Section 7.02(j), the pro forma combined financial
statements of the Company and its Consolidated Subsidiaries (exclusive of its
former Gaming Segment) and Promus and its Consolidated Subsidiaries for the
twelve month period ended September 30, 1999 heretofore delivered by the
Company to the Agent and each Bank, and (b) thereafter, the pro forma
combined financial statements for the twelve month period ended December 31,
1999, so delivered.

                                      -3-

<PAGE>

              "Promus" means Promus Hotel Corporation, Inc., a Delaware
corporation.

              "Promus Acquisition" means the merger of Promus Hotels
Corporation with a Subsidiary of the Company on the effective date hereof, as
a result of which the Company will own, directly or indirectly, all of the
issued and outstanding capital stock of the corporation surviving such merger.

              "Rating Agencies" means S&P or Moody's.

              1.3    OTHER AMENDMENTS

              1.3.1  INFORMATION. Section 7.02 of the Reimbursement Agreement
         is amended to add thereto new clause (j), to read in full as follows:

              "(j)   as soon as available and in any event no later than
       March 31, 2000, a pro forma combined statement of income of the Company,
       Promus and their respective Consolidated Subsidiaries for the period
       commencing January 1, 1999 and ending on December 31, 1999, and a pro
       forma combined balance sheet of the Company, Promus and their respective
       Consolidated Subsidiaries as at December 31, 1999, in each case prepared
       in a manner consistent with the Pro Forma Combined Financial Statements
       delivered to the Agent and the Banks prior to the date hereof."

              1.3.2  STATUS ELECTION. Section 7.02(c) of the Reimbursement
Agreement is hereby amended to delete clause (iii) thereof, it being
understood that the Company shall not be required to notify the Agent or the
Banks of whether interest rates and fees shall be determined on the basis of
its Ratings or the Leverage Ratio (with the Company to automatically receive
the benefits of the more favorable basis of computation).

              1.3.3  PRICING CERTIFICATE AND COMBINED PRO FORMAS. Section
7.02 of the Reimbursement Agreement is further amended to add thereto new
clause (k), to read in full as follows:

              "(k)   as soon as available and in any event not later than the
       last day of February of each year, a completed Pricing Certificate as of
       December 31 of the prior year."

              1.3.4  SECTION 7.10. Section 7.10 is hereby deleted in its
entirety and amended in full to read as follows:

              "Section 7.10. LEVERAGE RATIO. The Leverage Ratio will not, as
              of the last day of any fiscal quarter of the Company described
              in the matrix below, exceed the ratio set forth opposite that
              fiscal quarter:

                     Fiscal Quarters Ending                   Maximum Ratio
                     ----------------------                   -------------
                     September 30, 1999 through and           5.00:1.00
                     including December 31, 2000

                                     -4-

<PAGE>

                     March 31, 2001 through and including
                     March 31, 2002                           4.75:1.00

                     Thereafter                               4.50:100."

              1.3.5  PRICING SCHEDULE. The Pricing Schedule attached as
Exhibit A to the Third Amendment to Reimbursement Agreement, dated as of
June 30, 1996 is hereby deleted in its entirety and the Pricing Schedule
attached to this Agreement as Exhibit A is hereby incorporated into the
Reimbursement Agreement by this reference as if originally set forth in full
therein.

              2.     REPRESENTATIONS AND WARRANTIES. The Company represents
and warrants to the Issuer, the Agent and the Banks as follows:

              2.1    AUTHORITY. The Company has all necessary power and has
taken all corporate action necessary to make this Agreement and all other
agreements and instruments executed in connection herewith the legal, valid
and binding obligations they purport to be.

              2.2    NO LEGAL OBSTACLE TO AGREEMENT. The execution of this
Agreement has not constituted or resulted in and will not constitute or
result in a breach of any provision of any contract to which the Company is a
party, or the violation of any law, judgment, decree or governmental order,
rule or regulation applicable to, or result in the creation under any
agreement or instrument of any security interest, lien, charge or encumbrance
upon any of the assets of, the Company, except in favor of the Agent and the
Banks or as permitted by the Reimbursement Agreement. No approval or
authorization of any governmental authority is required to permit the
execution, delivery or performance of this Agreement, or the transactions
contemplated hereby or thereby.

              2.3    INCORPORATION OF CERTAIN REPRESENTATIONS AND WARRANTIES.
The representations and warranties set forth in Article VI of the
Reimbursement Agreement are true and correct in all respects on and as of the
date hereof, as through made on and as of the date hereof, except to the
extent that such representations and warranties expressly relate to an
earlier date.

              2.4    DEFAULT. Upon this Agreement becoming effective pursuant
to Section 3.1 hereof, no Default or Event of Default has occurred and is
continuing.

              3.     MISCELLANEOUS.

              3.1    EFFECTIVE DATE. This Amendment shall become effective on
the date (the "Fourth Amendment Effective Date") when the Company, the Agent,
the Issuer, each Existing Bank and each New Bank shall have signed a
counterpart hereof (whether the same or different counterparts) and shall have
delivered (including by way of facsimile transmission) the same to the Agent.

              3.2    EFFECT OF AGREEMENT ON REIMBURSEMENT. Except as affected
hereby, the Reimbursement Agreement, the other Related Documents and any and
all other agreements, documents, certificates and other instruments executed
in connection therewith, shall remain in

                                      -5-

<PAGE>

full force and effect in accordance with their respective terms. Except as
otherwise provided herein, the Reimbursement Agreement, the other Related
Documents and any and all other agreements, documents, certificates and other
instruments executed in connection therewith, are in all respects ratified
and confirmed, and nothing contained in this Agreement shall, or shall be
construed to, modify, invalidate or otherwise affect any provision of such
agreements, documents, certificates and instruments or any right of the
parties thereto.

              3.3    EFFECT OF BREACH OF AGREEMENT. The Company hereby
acknowledges and agrees that a breach of or noncompliance with any of the
representations, warranties, covenants or terms contained herein shall
constitute an Event of Default.

              3.4    NO WAIVER OF EVENT OF DEFAULT. The execution of this
Agreement by the Issuer, the Agent and the Banks does not constitute a waiver
of any Event of Default which not exists or which may occur hereafter.

              3.5    COUNTERPARTS. This Amendment may be executed in any
number of counterparts and by the different parties hereto on separate
counterparts, each of which counterparts when executed and delivered shall be
an original, but all of which shall together constitute one and the same
instrument. A complete set of counterparts shall be lodged with the Company
and the Agent.

              3.6    GOVERNING LAW. THIS AMENDMENT AND THE RIGHTS AND
OBLIGATIONS OF THE PARTIES HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE WITH
AND GOVERNED BY THE LAW OF THE STATE OF NEW YORK.

              3.7    REFERENCE. From and after the Fourth Amendment Effective
Date, all references in the Reimbursement Agreement and each of the Related
Documents to the Reimbursement Agreement shall be deemed to be references to
the Reimbursement Agreement as amended hereby.

                                 *       *       *

                                        -6-

<PAGE>

              IN WITNESS WHEREOF, the parties hereto have caused this
Agreement to be duly executed and delivered by their respective duly
authorized officers as of the date first above written.

                              THE COMPANY

                              HILTON HOTELS CORPORATION

                              By  /s/ Mariel Albrecht
                                ------------------------------------------------
                                Title:

                              Hilton Hotels Corporation
                              9336 Civic Center Drive
                              Beverly Hills, CA 90210
                              Attention: Mariel Albrecht
                                         Vice President and Assistant Treasurer
                              Tel:       (310) 205-4331
                              Fax:       (310) 205-7849

                              THE AGENT

                              DEUTSCHE BANK AG, NEW YORK BRANCH, as
                                Agent

                              By
                                ----------------------------------------------
                                Title:

                              By
                                ----------------------------------------------
                                Title:

                              Deutsche Bank AG, New York Branch
                              31 West 52nd Street
                              New York, New York 10019
                              Attention: Inken Finnamore
                              Tel:       (212) 469-8348
                              Fax:       (212) 469-8501

                                      -7-

<PAGE>

                              THE ISSUER

                              DEUTSCHE BANK AG, NEW YORK BRANCH, as
                                Issuer of the Letter of Credit

                              By
                                ----------------------------------------------
                                Title:

                              By
                                ----------------------------------------------
                                Title:

                              Deutsche Bank AG, New York Branch
                              31 West 52nd Street
                              New York, New York 10019
                              Attention: Volker Fischer
                                         Trade Finance
                              Tel:       (212) 469-8636
                              Fax:       (212) 469-7880

                                      -8-

<PAGE>

                              THE BANKS

                              DEUTSCHE BANK AG, NEW YORK BRANCH, AS
                                SUCCESSOR TO DEUTSCHE BANK AG, LOS
                                ANGELES BRANCH

                              By
                                ----------------------------------------------
                                Title:

                              By
                                ----------------------------------------------
                                Title:

                              Deutsche Bank AG, New York Branch, as Successor to
                               Deutsche Bank AG, Los Angeles Branch
                              31 West 52nd Street
                              New York, New York 10019
                              Attention: Thomas Foley
                                         Vice President
                              Tel:       (212) 469-8636
                              Fax:       (212) 469-7880

                              CITICORP USA, INC.

                              By
                                ----------------------------------------------
                                Title:

                              Citicorp USA, Inc.
                              787 West 5th Street
                              29th Floor
                              Los Angeles, California 90071
                              Attention: Walter L. Larsen
                                         Managing Director
                              Tel:       (213) 239-1501
                              Fax:       (213) 624-9765

                                     -9-

<PAGE>

                              THE BANK OF NEW YORK

                              By
                                ----------------------------------------------
                                Title:

                              The Bank of New York
                              10990 Wilshire Boulevard
                              Suite 1125
                              Los Angeles, California 90024
                              Attention: Lisa Brown
                              Tel:       (310) 996-8656
                              Fax:       (310) 996-8667

                              SOCIETE GENERALE

                              By
                                ----------------------------------------------
                                Title:

                              Societe Generale
                              2029 Century Park East
                              Suite 2900
                              Los Angeles, California 90067
                              Attention: Alex Kim
                              Tel:       (310) 788-7104
                              Fax:       (310) 551-1537

                                       -10-

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