RIV ACQUISITION HOLDINGS INC. 650 Madison Avenue 15th Floor New York, New York 10022 July 18, 2007 Syd Ghermezian Triple Five Investco, LLC. 9510 West Sahara, Suite 200 Las Vegas, Nevada 89117 Dear Mr. Ghermezian: Reference is made to the agreement...

                                                                   EXHIBIT 10.31

                          RIV ACQUISITION HOLDINGS INC.
                               000 Xxxxxxx Xxxxxx
                                   00xx Xxxxx
                            Xxx Xxxx, Xxx Xxxx 00000


                                  July 18, 2007

Xxx Xxxxxxxxxx
Triple Five Investco, LLC.
0000 Xxxx Xxxxxx, Xxxxx 000
Xxx Xxxxx, Xxxxxx 00000

Dear Xx. Xxxxxxxxxx:

Reference is made to the agreement dated March 21, 2007 among Riv Acquisition
Holdings Inc. ("RAH"), Triple Five Investco LLC and Dominion Financial LLC (the
"Agreement"). RAH hereby advises you that it is extending the Term (as defined
in the Agreement) pursuant to section 2 of the Agreement for thirty days
commencing on July 20, 2007. In consideration of such extension, RAH has already
wired the amount of $173,547.29 to the account previously designated by you.

Sincerely,



/s/ Xxxx Xxxxxxx
---------------------
Xxxx Xxxxxxx
President