EXHIBIT 10.21

                            PATENT SECURITY AGREEMENT
                            -------------------------
                   (Savvis Communications International, Inc.)

         THIS PATENT SECURITY AGREEMENT ("Agreement") is between Savvis
Communications International, Inc., a Delaware corporation ("Debtor"), and
General Electric Capital Corporation, a Delaware corporation, as Agent for
itself and other Lessors from time to time party to the Restated Lease Agreement
as defined below (in such capacity, together with its successors and assigns in
such capacity, "Secured Party"), and as Lessor pursuant to that certain Amended
and Restated Lease Agreement dated as of March 8, 2002 (as the same may be
amended, modified, supplemented, renewed, extended or restated from time to
time, the "Restated Lease Agreement") among Savvis Communications Corporation, a
Delaware corporation and Secured Party.

                                R E C I T A L S:
                                ---------------

         A.      Debtor and Secured Party have entered into that certain
Security Agreement dated as of March 18, 2002 (as the same may be amended,
modified, supplemented, renewed, extended or restated from time to time, the
"Security Agreement"; all terms defined in the Security Agreement, wherever used
herein, shall have the same meanings herein as are prescribed by the Security
Agreement).

         B.      Pursuant to the terms of the Security Agreement, Debtor has
granted to Secured Party a lien and security interest in all General Intangibles
of Debtor including, without limitation, all of Debtor's right, title, and
interest in, to and under all now owned and hereafter acquired Patents and
Patent Licenses, and all products and Proceeds thereof, to secure the payment of
the Obligations (as defined in the Restated Lease Agreement).

         NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Debtor hereby grants to Secured
Party a lien and continuing security interest in all of Debtor's right, title,
and interest in, to, and under the following (all of the following items or
types of Property being herein collectively referred to as the "Patent
Collateral"), whether presently existing or hereafter created or acquired, and
such grant insofar as it applies to Collateral covered by the Master Lease
Agreement (as defined in the Restated Lease Agreement), is in confirmation of
the existing and continuing Lien and security interest granted under the Master
Lease Agreement:

                  (1)      each Patent and each application for a Patent
         ("Patent Application"), including, without limitation, each Patent and
         Patent Application referred to in Schedule 1 annexed hereto, together
         with any reissues, continuations, divisions, modifications,
         substitutions or extensions thereof;

                  (2)      each Patent License,  including,  without limitation,
         each Patent License referred to in Schedule 1 annexed hereto; and

                  (3)       all products and Proceeds of the foregoing,
         including, without limitation, any claim by Debtor against third
         parties for past, present, or future infringement or breach of any
         Patent or Patent License, including, without limitation, any Patent or
         Patent License referred to in Schedule 1 annexed hereto, and any Patent
         issued pursuant to a Patent Application referred to in Schedule 1
         annexed hereto.

The lien and security interest contained in this Agreement is granted in
conjunction with the liens and security interests granted to Secured Party
pursuant to the Security Agreement.




TRADEMARK SECURITY AGREEMENT (Savvis Communications International, Inc.) - 1

<PAGE>

         Debtor hereby acknowledges and affirms that the rights and remedies of
Secured Party with respect to the liens and security interests in the Patent
Collateral made and granted hereby are more fully set forth in the Security
Agreement, the terms and provisions of which are incorporated by reference
herein as if fully set forth herein.


















TRADEMARK SECURITY AGREEMENT (Savvis Communications International, Inc.) - 2
<PAGE>


         IN WITNESS WHEREOF, Debtor has caused this Agreement to be duly
executed by its duly authorized officer as of the date written above.

                                           DEBTOR:
                                           ------

                                           SAVVIS COMMUNICATIONS INTERNATIONAL,
                                           INC., a Delaware corporation


                                           By:  /s/ David J. Frear
                                               ---------------------------------
                                           Name:  David J. Frear
                                           Title: President

                                           SECURED PARTY:
                                           -------------

                                           GENERAL ELECTRIC CAPITAL CORPORATION,
                                           a Delaware corporation, as Agent


                                           By: /s/ Robert Wotten
                                               ---------------------------------
                                           Name:  Robert Wotten
                                           Title: Vice President



TRADEMARK SECURITY AGREEMENT (Savvis Communications International, Inc.) - 3
<PAGE>


                                 ACKNOWLEDGMENT
                                 --------------

STATE OF Virginia          )

                           )

COUNTY OF Fairfax          )

         This instrument was acknowledged before me this 13th day of
March, 2002, by David J. Frear, as President of Savvis Communications
International, Inc., a Delaware corporation, on behalf of such corporation.

                                          /s/ Tracey Guyan
                                          -------------------------------------
         {Seal}                           Notary Public in and for the State of
                                              Virginia

My commission expires: 8/31/03





STATE OF Connecticut       )

                           )

COUNTY OF Fairfield        )

         This instrument was acknowledged before me this 15th day of March,
2002, by Robert Wotten, as Vice President of General Electric Capital
Corporation, a Delaware corporation, as Agent, on behalf of such corporation.


                                          /s/ Delythe Eugenie Lowry
                                          -------------------------------------
         {Seal}                           Notary Public in and for the State of
                                              Connecticut

My commission expires: 8/31/05







TRADEMARK SECURITY AGREEMENT (Savvis Communications International, Inc.) - 4

<PAGE>


                                   Schedule 1
                                       to
                            Patent Security Agreement
                            -------------------------

                                     PATENTS
                                     -------

None.


                                 PATENT LICENSES
                                 ---------------

None.












TRADEMARK SECURITY AGREEMENT (Savvis Communications International, Inc.) - 5