Document:

Exhibit 10.27

                SIXTH AMENDED AND RESTATED JOINT FILING AGREEMENT
                -------------------------------------------------
                          PURSUANT TO RULE 13d-1(k)(1)
                          ----------------------------

This Sixth Amended and Restated Agreement is made pursuant to Rule 13d-1(k)(1)
under the Securities Exchange Act of 1934, as amended (the "Act") by and among
the parties listed below, each referred to herein as a "Joint Filer." The Joint
Filers agree that a statement of beneficial ownership as required by Section
13(d) of the Act and the Rules thereunder may be filed on each of their behalf
on Schedule 13D or Schedule 13G, as appropriate, and that said joint filing may
thereafter be amended by further joint filings. The Joint Filers state that they
each satisfy the requirements for making a joint filing under Rule 13d-1.

Dated: June 4, 2007

                     [remainder of page intentionally blank]

<PAGE>

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
date first above written.

                                    Flag Luxury Riv, LLC

                                    By: /s/ Paul Kanavos
                                       -----------------------------------------
                                    Name:   Paul Kanavos
                                    Title:  President

                                    CKX, Inc.

                                    By:  /s/ Robert F.X. Sillerman
                                       -----------------------------------------
                                    Name:   Robert F.X. Sillerman
                                    Title:  Chief Executive Officer

                                    FX Luxury Realty, LLC

                                       By: Flag Luxury Properties, LLC
                                          ----------------------------

                                          By: /s/ Paul Kanavos
                                             -----------------------------------
                                          Name:  Paul Kanavos
                                          Title: President

                                       By: CKX, Inc.
                                          ----------------------------

                                          By: /s/ Robert F.X. Sillerman
                                             -----------------------------------
                                          Name:   Robert F.X. Sillerman
                                          Title:  Chief Executive Officer

                                    Flag Luxury Properties, LLC

                                    By: /s/ Paul Kanavos
                                       -----------------------------------------
                                    Name:   Paul Kanavos
                                    Title:  President

<PAGE>

                                    MJX Flag Associates, LLC

                                    By: /s/ Robert F.X. Sillerman
                                       -----------------------------------------
                                    Name:   Member
                                    Title:  Robert F.X. Sillerman

                                    RH1, LLC

                                    By: Flag Leisure Group, LLC
                                        Its sole member

                                          By: /s/ Paul Kanavos
                                             -----------------------------------
                                          Name:  Paul Kanavos
                                          Title: President

                                    Flag Leisure Group, LLC

                                    By: /s/ Paul Kanavos
                                       -----------------------------------------
                                    Name:   Paul Kanavos
                                    Title:  President

<PAGE>

                                    MJX Real Estate Ventures, LLC

                                    By: /s/ Robert F.X. Sillerman
                                       -----------------------------------------
                                    Name:   Robert F.X. Sillerman
                                    Title:  Member

                                    LMN 134 Family Company LLC

                                    By: /s/ Mitchell J. Nelson
                                       -----------------------------------------
                                    Name:   Mitchell J. Nelson
                                    Title:  Managing Member

                                    Mitchell J. Nelson

                                    /s/ Mitchell Nelson
                                    --------------------------------------------

                                    Robert F.X. Sillerman

                                    /s/ Robert F.X. Sillerman
                                    --------------------------------------------

                                    Paul Kanavos

                                    /s/ Paul Kanavos
                                    --------------------------------------------

<PAGE>

                                    Brett Torino

                                    /s/ Brett Torino
                                    --------------------------------------------

<PAGE>

                                    ONIROT Living Trust dated 06/20/2000

                                    By: /s/ Brett Torino
                                       -----------------------------------------
                                    Name:   Brett Torino
                                    Title:  Trustee

<PAGE>

                                    Rivacq LLC

                                    By: SOF U.S. Hotel Co-Invest Holdings,
                                       -----------------------------------
                                        L.L.C.
                                        ------

                                       By: SOF-VII U.S. Hotel Holdings, L.L.C.
                                          ------------------------------------

                                          By: /s/ Barry S. Sternlicht
                                             -----------------------------------
                                          Name:   Barry S. Sternlicht
                                          Title:  Chief Executive Officer

                                       By: I-1/I-2 U.S. Holdings, L.L.C.

                                          By: /s/ Barry S. Sternlicht
                                             -----------------------------------
                                          Name:   Barry S. Sternlicht
                                          Title:  Chief Executive Officer

                                    SOF U.S. Hotel Co-Invest Holdings, L.L.C.

                                    By: SOF-VII U.S. Hotel Holdings, L.L.C.
                                        -----------------------------------

                                       By: /s/ Barry S. Sternlicht
                                          --------------------------------------
                                       Name:   Barry S. Sternlicht
                                       Title:  Chief Executive Officer

                                    By: I-1/I-2 U.S. Holdings, L.L.C.

                                       By: /s/ Barry S. Sternlicht
                                          --------------------------------------
                                       Name:   Barry S. Sternlicht
                                       Title:  Chief Executive Officer

                                    SOF-VII U.S. Hotel Holdings, L.L.C.

                                    By: /s/ Barry S. Sternlicht
                                       -----------------------------------------
                                    Name:   Barry S. Sternlicht
                                    Title:  Chief Executive Officer

<PAGE>

                                    I-1/I-2 U.S. Holdings, L.L.C.

                                    By: /s/ Barry S. Sternlicht
                                       -----------------------------------------
                                    Name:   Barry S. Sternlicht
                                    Title:  Chief Executive Officer

                                    Starwood Global Opportunity Fund VII-A, L.P.

                                    By:  /s/ Barry S. Sternlicht
                                       -----------------------------------------
                                       Its general partner

                                       By: Starwood Capital Group Global, L.L.C.
                                          --------------------------------------
                                       Its General manager

                                                 /s/ Barry S. Sternlicht
                                                 -------------------------------
                                                 Name:  Barry S. Sternlicht
                                                 Title: Chief Executive Officer

                                    Starwood Global Opportunity Fund VII-B, L.P.

                                    By: SOF-VII Management, L.L.C.
                                       -----------------------------------------
                                    Its general partner

                                       By: Starwood Capital Group Global, L.L.C.
                                          --------------------------------------
                                       Its General manager

                                               By: /s/ Barry S. Sternlicht
                                                  ------------------------------
                                               Name:   Barry S. Sternlicht
                                               Title:  Chief Executive Officer

                                    Starwood U.S. Opportunity Fund VII-D, L.P.

                                    By: SOF-VII Management, L.L.C.
                                       -----------------------------------------
                                       Its general partner

                                       By: Starwood Capital Group Global, L.L.C.
                                          --------------------------------------
                                          Its General manager

                                               By: /s/ Barry S. Sternlicht
                                                  ------------------------------
                                               Name:   Barry S. Sternlicht
                                               Title:  Chief Executive Officer

<PAGE>

                                 Starwood U.S. Opportunity Fund VII-D-2, L.P.

                                    By: SOF-VII Management, L.L.C.
                                       -----------------------------------------
                                       Its general partner

                                       By: Starwood Capital Group Global, L.L.C.
                                          --------------------------------------
                                          Its General manager

                                               By: /s/ Barry S. Sternlicht
                                                  ------------------------------
                                               Name:   Barry S. Sternlicht
                                               Title:  Chief Executive Officer

                                    Starwood Capital Hospitality Fund I-1, L.P.

                                    By: SCG Hotel Management, L.L.C.
                                       -----------------------------------------
                                       Its general partner

                                       By: Starwood Capital Group Global, L.L.C.
                                           -------------------------------------
                                           Its General manager

                                              By: /s/ Barry S. Sternlicht
                                                 -------------------------------
                                                 Name:  Barry S. Sternlicht
                                                 Title: Chief Executive Officer

                                    Starwood Capital Hospitality Fund I-2, L.P.

                                    By: SCG Hotel Management, L.L.C.
                                       -----------------------------------------
                                       Its general partner

                                       By: Starwood Capital Group Global, L.L.C.
                                           -------------------------------------
                                           Its General manager

                                              By: /s/ Barry S. Sternlicht
                                                 -------------------------------
                                                 Name:  Barry S. Sternlicht
                                                 Title: Chief Executive Officer

<PAGE>

                                    SOF-VII Management, L.L.C.

                                       By: Starwood Capital Group Global, L.L.C.
                                          --------------------------------------
                                          Its General manager

                                               By: /s/ Barry S. Sternlicht
                                                  ------------------------------
                                               Name:   Barry S. Sternlicht
                                               Title:  Chief Executive Officer

                                    SCG Hotel Management, L.L.C.

                                       By: Starwood Capital Group Global, L.L.C.
                                          --------------------------------------
                                          Its General manager

                                               By: /s/ Barry S. Sternlicht
                                                  ------------------------------
                                               Name:   Barry S. Sternlicht
                                               Title:  Chief Executive Officer

                                    Starwood Capital Group Global, LLC

                                    By: /s/ Barry S. Sternlicht
                                       -----------------------------------------
                                    Name:   Barry S. Sternlicht
                                    Title:  Chief Executive Officer

                                    Barry S. Sternlicht

                                    /s/ Barry S. Sternlicht
                                    --------------------------------------------Exhibit 10.28

                              FLAG LUXURY RIV, LLC
                               650 Madison Avenue
                            New York, New York 10022

                                  May 29, 2007

Rivacq LLC
591 West Putnam Avenue
Greenwich, CT  06830
Attention: Barry Sternlicht

RH1, LLC
c/o Torino Companies
4445 Wagon Trail Avenue
Las Vegas, NV 89118
Attention: Brett Torino

      Re:   Allocation of Fee Under Option Agreement
            ----------------------------------------

Dear Barry and Brett:

Reference is made to the Agreement (the "Option Agreement"), dated March 21,
2007, among Riv Acquisition Holdings, Inc. ("RAH"), Triple Five Investco LLC
("Triple Five") and Dominion Financial LLC (together with Triple Five, "T5").

This will confirm that (i) each of Flag Luxury Riv, LLC ("Flag") and Rivacq LLC
("Rivacq") contributed 50% (or $1,150,000) of the aggregate payment of
$2,300,000 paid by RAH to T5 pursuant to the Option Agreement and, accordingly,
(ii) each of Flag and Rivacq are entitled to the beneficial ownership of 50% of
any shares of Riviera Holdings Corporation that RAH may acquire from T5 upon
exercise of the option under the Option Agreement.

Please sign below to indicate your acknowledgment of the foregoing.

                                    Very truly yours,

                                    FLAG LUXURY RIV, LLC

                                    By:/s/ Paul Kanavos
                                       -----------------------------------------
                                       Name: Paul Kanavos
                                       Title: President

<PAGE>

Acknowledged and Agreed:

RIVACQ LLC

By: SOF U.S. Hotel Co-Invest Holdings,
    L.L.C.

    By: SOF-VII U.S. Hotel Holdings, L.L.C.

        By: /s/ Barry S. Sternlicht
            ----------------------------
            Name: Barry S. Sternlicht
            Title: Chief Executive Officer

By: I-1/I-2 U.S. Holdings, L.L.C.

    By: /s/ Barry S. Sternlicht
        ----------------------------
        Name: Barry S. Sternlicht
        Title: Chief Executive Officer

RH1, LLC

By: Flag Leisure Group, LLC
    Its sole member

    By: /s/ Paul Kanavos
        ----------------------------
        Name: Paul Kanavos
        Title: President

                                       -2-

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