Document:

<PAGE>

                     TRADEMARK SECURITY INTEREST ASSIGNMENT
                     --------------------------------------

          This TRADEMARK SECURITY INTEREST ASSIGNMENT (the "Assignment") dated
as of March 18, 1999 is made by Coast Hotels and Casinos, Inc., a Nevada
corporation ("Borrower") and Coast Resorts, Inc., a Nevada corporation
("Guarantor"), together with each other Person who may become a party hereto
pursuant to Section 9 of this Assignment (each a "Grantor" and collectively,
"Grantors"), jointly and severally, in favor of Bank of America National Trust
and Savings Association, as the Administrative Agent under the Loan Agreement
referred to below for the ratable benefit of each of the Lenders which are
parties to the Loan Agreement from time to time, as Secured Party, with
reference to the following facts:

                                    RECITALS
                                    --------

          A.   Pursuant to the Loan Agreement (the "Loan Agreement") of even
date herewith among Borrower, the Lenders referred to therein, and the
Administrative Agent, the Lenders are extending a reducing revolving line of
credit to Borrower (as at any time amended, the "Loan Agreement").

          B.   Guarantor has issued a Guaranty of even date herewith of the
Obligations of Borrower under the Loan Agreement (as at any time amended,
renewed, replaced, extended or supplanted, the "Guaranty").

          C.   It is a condition to the credit facilities under the Loan
Agreement that Borrower and Guarantor enter into this Assignment, and Borrower
has covenanted to cause any Subsidiary hereafter formed or acquired by Borrower
or Guarantor to enter into a joinder hereto.

                                   AGREEMENT

          NOW, THEREFORE, in order to induce the Lenders to extend the
aforementioned credit facilities to Borrower, and for other good and valuable
consideration, the receipt and adequacy of which are hereby acknowledged,
Borrower and Guarantor, as initial Grantors hereunder, and each of the
subsequent Grantors which hereafter become party hereto, hereby jointly and
severally represent, warrant, covenant and agree as follows:

                                      -1-
<PAGE>

          1.   Definitions.  This Assignment is the Trademark Assignment
               -----------
referred to in the Loan Agreement.  Terms defined in the Loan Agreement and not
otherwise defined in this Assignment shall have the meanings defined for those
terms in the Loan Agreement.  As used in this Assignment, the following terms
shall have the meanings respectively set forth after each:

          "Assignment" means this Trademark Security Interest Assignment, and
           ----------
any extensions, modifications, renewals, restatements, supplements or amendments
hereof, including, without limitation, any documents or agreements by which
        ---------
additional Grantors become party hereto.

          "Collateral" means and includes all of the following:  (a) all of
           ----------
Grantors' now-existing, or hereafter acquired, right, title, and interest in and
to all of Grantors' trademarks, trade names, trade styles, and service marks;
all prints and labels on which said trademarks, trade names, trade styles, and
service marks appear, have appeared, or will appear, and all designs and general
intangibles of a like nature; all applications, registrations, and recordings
relating to the foregoing in the United States Patent and Trademark Office
("USPTO") or in any similar office or agency of the United States, any State
thereof, or any political subdivision thereof, and all reissues, extensions, and
renewals thereof, including those trademarks, trade names, trade styles, service
marks, terms, designs, and applications described in Schedule 1 hereto (the
                                                     ----------
"Trademarks"); (b) the goodwill of the business symbolized by each of the
Trademarks, including, without limitation, all customer lists and other records
relating to the distribution of products or services bearing the Trademarks; (c)
all licenses and sublicenses of trademarks, trade names, trade styles and
service marks, to the extent that there exists no prohibition as a matter of law
on the transfer thereof for security as contemplated by this Assignment, and (d)
any and all proceeds of any of the foregoing, including any claims by Grantors
against third parties for past, present and future infringement of the
Trademarks or any licenses with respect thereto, provided that the term
                                                 --------
"Collateral", as used in this Assignment, shall not include gaming licenses or
-----------                                     ---
liquor licenses which are not transferable without the consent of Governmental
Authorities.

          "Secured Obligations" means (a) in the case of Borrower, any and all
           -------------------
present and future Obligations of any type or nature of Borrower to the
Administrative Agent, the Lenders, and any one or more of them, arising under or
relating to the Loan Documents or any one or more of them, and (b) in the case
of Guarantor and each other Grantor, the obligations of that Grantor under any
guaranty which that Grantor has executed in favor of Secured Party with respect
to the obligations of Borrower to Secured Party, in each case whether due or to
become due, matured or unmatured, liquidated or unliquidated, or contingent or

                                      -2-
<PAGE>

noncontingent, including Obligations of performance as well as Obligations of
               ---------
payment, and including interest that accrues after the commencement of any
             ---------
bankruptcy or insolvency proceeding by or against any Grantor.

          "Secured Party" means the Administrative Agent who shall receive and
           -------------
hold the assignments made hereunder for the ratable benefit of each of the
Lenders which are parties to the Loan Agreement from time to time.  Subject to
the terms and conditions of the Loan Agreement, any right, remedy, privilege, or
power of Secured Party shall be exercised by the Administrative Agent.

          2.   Assignment.  For valuable consideration, Grantors and each of
               ----------
them hereby jointly and severally grant and assign to Secured Party a security
interest, to secure the prompt and indefeasible payment and performance of the
Secured Obligations, and each of them, in and to all of the presently existing
and hereafter acquired Collateral.  This Assignment is a continuing and
irrevocable agreement and all the rights, powers, privileges and remedies
hereunder shall apply to any and all Secured Obligations, including those
arising under successive transactions which shall either continue the Secured
Obligations, increase or decrease them and notwithstanding the bankruptcy of any
Grantor or any other event or proceeding affecting any Grantor.

          3.   Representations, Warranties and Covenants.  Grantors, and each of
               -----------------------------------------
them, represent, warrant and agree that:

               (a) All of the existing Collateral is valid and subsisting and in
     full force and effect, and Grantors own the sole, full, and clear title
     thereto, and the right and power to grant the security interests granted
     hereunder (subject to any inconsistent rights of the Trustee under the 13%
     Indenture).  Grantors will, at their expense, perform all acts and execute
     all documents necessary to maintain the existence of the Collateral as
     valid, subsisting, and registered trademarks, including, without
     limitation, the filing of any renewal affidavits and applications.  The
     Collateral is not subject to any Liens, claims, mortgages, assignments or
     licenses of any nature whatsoever, whether recorded or unrecorded, except
                                                                        ------
     as permitted by the Loan Agreement.

               (b) As of the date hereof, none of Grantors or their Subsidiaries
     has any Trademarks registered, or subject to pending applications, in the
     USPTO, or any similar office or agency in the United States, other than
     those described in Schedule 1.
                        ----------

               (c) No Grantor nor any Subsidiary of any Grantor shall file any

                                      -3-
<PAGE>

     application for the registration of a trademark with the USPTO or any
     similar office or agency in the United States, or State therein, unless
     such Grantor or Subsidiary has informed Secured Party of such action in
     advance or informs Secured Party promptly thereafter.  Upon request of
     Secured Party, Grantors shall execute and deliver to Secured Party any and
     all agreements, instruments, documents, and such other papers as may be
     reasonably requested by Secured Party to evidence the grant and assignment
     of a security interest to Secured Party of such trademark.  Each Grantor
     authorizes Secured Party to modify this Assignment by amending Schedule 1
                                                                    ----------
     to include any new trademark or service mark, and any trademark or service
     mark renewal of any Grantor applied for and obtained hereafter.

               (d) No Grantor nor any Subsidiary of any Grantor has abandoned
     any of the Trademarks, and no Grantor nor any Subsidiary of any Grantor
     will do any act, or omit to do any act, whereby the Trademarks may become
     abandoned, canceled, invalidated, unenforceable, avoided, or avoidable.
     Each Grantor shall notify Secured Party promptly if it knows, or has reason
     to know, of any reason why any application, registration, or recording may
     become abandoned, canceled, invalidated, or unenforceable.

               (e) Grantors will render any assistance, as Secured Party may
     reasonably determine is necessary, to Secured Party in any proceeding
     before the USPTO, any federal or state court, or any similar office or
     agency in the United States, or any State therein, to protect Secured
     Party's security interest in the Trademarks.

               (f) Grantors assume all responsibility and liability arising from
     the use of the Trademarks, and each Grantor hereby indemnifies and holds
     the Administrative Agent and each of the Lenders harmless from and against
     any claim, suit, loss, damage, or expense (including reasonable attorneys'
     fees) arising out of any alleged defect in any product manufactured,
     promoted, or sold by any Grantor (or any Affiliate or Subsidiary thereof)
     in connection with any Trademark or out of the manufacture, promotion,
     labeling, sale, or advertisement of any such product by any Grantor or any
     Affiliate or Subsidiary thereof.

               (g) Grantors shall promptly notify Secured Party in writing of
     any adverse determination in any proceeding in the USPTO or domestic
     Governmental Agency, court or body, regarding any Grantor's ownership of
     any of the Trademarks. In the event of any material infringement of any of
     the Trademarks by a third party, Grantors shall promptly notify Secured
     Party of such infringement and shall diligently pursue damages or an
     injunction for such infringement.

                                      -4-
<PAGE>

               (h) Each Grantor shall, at its sole expense, do, make, execute
     and deliver all such additional and further acts, things, assurances, and
     instruments, in each case in form and substance reasonably satisfactory to
     Secured Party, relating to the creation, validity, or perfection of the
     security interests provided for in this Assignment under 35 U.S.C. Section
     261, 15 U.S.C. Section 1051 et seq., the Uniform Commercial Code or other
                                 -- ---
     Law of the United States, the State of California, or of any other States
     as Secured Party may from time to time reasonably request, and shall take
     all such other action as the Secured Party may reasonably require to more
     completely vest in and assure to Secured Party its security interest in any
     of the Collateral, and each Grantor hereby irrevocably authorizes Secured
     Party or its designee, at such Grantor's expense, to execute such
     documents, and file such financing statements with respect thereto with or
     without such Grantor's signature, as Secured Party may reasonably deem
     appropriate.  In the event that any recording or refiling (or the filing of
     any statement of continuation or assignment of any financing statement) or
     any other action, is required at any time to protect and preserve such
     security interest, Grantors shall, at their sole cost and expense, cause
     the same to be done or taken at such time and in such manner as may be
     necessary and as may be reasonably requested by Secured Party.  Each
     Grantor further authorizes Secured Party to have this or any other similar
     security agreement recorded or filed with the Commissioner of Patents and
     Trademarks or other appropriate federal, state or government office.

               (i) Secured Party is hereby irrevocably appointed by each Grantor
     as its lawful attorney and agent, with full power of substitution to
     execute and deliver on behalf of and in the name of any or all Grantors,
     such financing statements and other documents and agreements, and to take
     such other action as Secured Party may deem necessary for the purpose of
     perfecting, protecting or effecting the security interests granted herein
     and effected hereby, and any mortgages or Liens necessary or desirable to
     implement or effectuate the same, under any applicable Law, and Secured
     Party is hereby authorized to file on behalf of and in the name of any or
     all Grantors, at Grantors' sole expense, such financing statements,
     documents and agreements in any appropriate governmental office.

               (j) Secured Party may, in its sole discretion, pay any amount, or
     do any act which Grantors fail to pay or do as reasonably required
     hereunder to preserve, defend, protect, maintain, record, amend, or enforce
     the Secured Obligations, the Collateral, or the security interest granted
     hereunder, including, but not limited to, all filing or recording fees,
     court costs, collection charges, and reasonable attorneys' fees. Grantors
     will be liable to Secured Party for any such payment, and any amount so

                                      -5-
<PAGE>

     paid shall be an expense reimbursable by Borrower under Section 11.3 of the
     Loan Agreement (or, in the proper case, by each other Grantor under the
     expense provisions of its Guaranty).

          4.   Events of Default.  Any "Event of Default" as defined in the Loan
               -----------------
Agreement shall constitute an Event of Default hereunder.

          5.   Rights and Remedies.  Upon the occurrence and during the
               -------------------
continuance of any such Event of Default, in addition to all other rights and
remedies of Secured Party, whether provided under Law, the Loan Agreement or
otherwise, Secured Party may enforce its security interest hereunder which may
be exercised without notice to, or consent by, any Grantor, except as such
                                                            ------
notice or consent is expressly provided for hereunder.  Upon such enforcement:

               (a) Secured Party may use any of the Trademarks for the sale of
     goods, completion of work in process, or rendering of services in
     connection with enforcing any security interest granted to Secured Party by
     Grantors or any Subsidiary of any Grantor.
               (b) Secured Party may grant such license or licenses relating to
     the Collateral for such term or terms, on such conditions and in such
     manner, as Secured Party shall, in its sole discretion, deem appropriate.
     Such license or licenses may be general, special, or otherwise, and may be
     granted on an exclusive or nonexclusive basis throughout all or part of the
     United States of America and its territories and possessions.

               (c) Secured Party may assign, sell, or otherwise dispose of the
     Collateral, or any part thereof, either with or without special conditions
     or stipulations, except that Secured Party agrees to provide Grantors with
                      ------
     ten (10) days' prior written notice of any proposed disposition of the
     Collateral.  Each Grantor hereby irrevocably appoints Borrower as its agent
     for the purpose of receiving notice of sale hereunder, and agrees that such
     Grantor conclusively shall be deemed to have received notice of sale when
     notice of sale has been given to Borrower.  Each Grantor expressly waives
     any right to receive notice of any public or private sale of any Collateral
     or other security for the Secured Obligations except as expressly provided
                                                   ------
     in this Section 5(c). Secured Party shall have the power to buy the
     Collateral, or any part thereof, and Secured Party shall also have the
     power to execute assurances and perform all other acts which Secured Party
     may, in Secured Party's sole discretion, deem appropriate or proper to
     complete such assignment, sale, or disposition.  In any such event,
     Grantors shall be liable for any deficiency.

                                      -6-
<PAGE>

               (d) In addition to the foregoing, in order to implement the
     assignment, sale or other disposition of any of the Collateral pursuant to
     Section 5(c) hereof, Secured Party may, at any time, execute and deliver,
     on behalf of Grantors, and each of them, pursuant to the authority granted
     in powers of attorney, one or more instruments of assignment of the
     Trademarks (or any application, registration, or recording relating
     thereto), in form suitable for filing, recording, or registration. Grantors
     agree to pay Secured Party, on demand, all costs incurred in any such
     transfer of the Collateral, including, but not limited to any taxes, fees,
     and reasonable attorneys' fees.

               (e) Secured Party may first apply the proceeds actually received
     from any such use, license, assignment, sale, or other disposition of
     Collateral first to the reasonable costs and expenses thereof, including,
     without limitation, reasonable attorneys' fees and all legal, travel, and
     other expenses which may be incurred by Secured Party.  Thereafter, Secured
     Party may apply any remaining proceeds to such of the Secured Obligations
     as provided in the Loan Agreement.  Grantors shall remain liable to Secured
     Party for any expenses or Secured Obligations remaining unpaid after the
     application of such proceeds, and Grantors will pay Secured Party, on
     demand, any such unpaid amount, together with interest at the rate(s) set
     forth in the Loan Agreement.

               (f) Upon request of Secured Party, Grantors shall supply to
     Secured Party, or Secured Party's designee, Grantors' knowledge and
     expertise relating to the manufacture and sale of the products and services
     bearing the Trademarks and Grantors' customer lists and other records
     relating to the Trademarks and the distribution hereof.

          Nothing contained herein shall be construed as requiring Secured Party
to take any such action at any time.  All of Secured Party's rights and
remedies, whether provided under Law, the Loan Agreement, this Assignment, or
otherwise shall be cumulative, and none is exclusive of any right or remedy
otherwise provided herein or in any of the other Loan Documents, at law or in
equity.  Such rights and remedies may be enforced alternatively, successively,
or concurrently.

          Secured Party or Designee will keep such confidential information,
lists or records provided hereunder in confidence in accordance with Section
11.4 of the Loan Agreement.

                                      -7-
<PAGE>

          6.   Waivers.
               -------

               (a) Each Grantor hereby waives any and all rights that it may
     have to a judicial hearing, if any, in advance of the enforcement of any of
     Secured Party's rights hereunder, including, without limitation, its rights
     following any Event of Default and during the continuance thereof to take
     immediate possession of the Collateral and exercise its rights with respect
     thereto.

               (b) Secured Party shall not be required to marshal any present or
     future security for (including, but not limited to, this Assignment and the
     Collateral subject to a security interest hereunder), or guaranties of, the
     Secured Obligations or any of them, or to resort to such security or
     guaranties in any particular order.  Each Grantor hereby agrees that it
     will not invoke any Law relating to the marshaling of collateral which
     might cause delay in or impede the enforcement of Secured Party's rights
     under this Assignment or any other instrument evidencing any of the Secured
     Obligations or by which any of such Secured Obligations is secured or
     guaranteed, and each Grantor hereby irrevocably waives the benefits of all
     such Laws.

               (c) Except for notices specifically provided for herein, each
     Grantor hereby expressly waives demand, notice, protest, notice of
     acceptance of this Assignment, notice of loans made, credit extended,
     collateral received or delivered or other action taken in reliance hereon
     and all other demands and notices of any description.  With respect both to
     Secured Obligations and any collateral therefor, each Grantor assents to
     any extension or postponement of the time of payment or any other
     indulgence, to any substitution, of any Person primarily or secondarily
     liable, to the acceptance of partial payment thereon and the settlement,
     compromising or adjusting of any thereof, all in such manner and at such
     time or times as Secured Party may deem advisable.  Secured Party shall
     have no duty as to the protection of the Collateral or any income thereon,
     nor as to the preservation of rights against prior parties, nor as to the
     preservation of any rights pertaining thereto except as otherwise required
     by Law.  Secured Party may exercise its rights with respect to the
     Collateral without resorting or regard to other collateral or sources of
     reimbursement for liability. Secured Party shall not be deemed to have
     waived any of its rights upon or under the Loan Agreement or the Collateral
     unless such waiver be in writing and signed by the Secured Party.  The
     exercise of the rights under this Agreement are not intended by the parties
     to constitute an "action" within the meaning of Sections 580a, 580d, or 726
     of the California Code of Civil Procedure.  No delay or omission on the
     part of the Secured Party in exercising any right shall operate as a waiver
     of any right on any future occasion.  All rights and remedies of the
     Secured Party under the Loan

                                      -8-
<PAGE>

     Agreement or on the Collateral, whether evidenced hereby or by any other
     instrument or papers, shall be cumulative and may be exercised singularly
     or concurrently.

          7.   Costs and Expenses.    Grantors will pay any and all charges,
               ------------------
costs and taxes incurred in implementing or subsequently amending this
Assignment, including, without limitation, recording and filing fees, appraisal
fees, stamp taxes, and reasonable fees and disbursements of Secured Party's
counsel incurred by Secured Party, and the allocated cost of in-house counsel to
Secured Party, in connection with this Assignment, and in the enforcement of
this Assignment and in the enforcement or foreclosure of any Liens, security
interests or other rights of the Secured Party under this Assignment, or under
any other documentation heretofore, now, or hereafter given to Secured Party in
furtherance of the transactions contemplated hereby.

          8.   Continuing Effect.  This Assignment shall remain in full force
               -----------------
and effect and continue to be effective should any petition be filed by or
against any Grantor for liquidation or reorganization, should any Grantor become
insolvent or make an assignment for the benefit of creditors or should a
receiver or trustee be appointed for all or any significant part of any
Grantor's assets.

          9.   Joinder.  Any other Person may become a Grantor hereunder and
               -------
become bound by the terms and conditions of this Assignment by executing and
delivering to Administrative Agent an Instrument of Joinder substantially in the
form attached hereto as Exhibit A, accompanied by such documentation as
                        ---------
Administrative Agent may require to establish the due organization, valid
existence and good standing of such Person, its qualification to engage in
business in each material jurisdiction in which it is required to be so
qualified, its authority to execute, deliver and perform this Assignment, and
the identity, authority and capacity of each Responsible Official thereof
authorized to act on its behalf.

          10.  Release of Grantors.  This Assignment and all Secured Obligations
               -------------------
of Grantors hereunder shall be released when all Secured Obligations have been
paid in full in cash or otherwise performed in full and when no portion of the
Commitments remain outstanding.  Upon such release of Grantors' Secured
Obligations hereunder, Secured Party shall return and reassign any Collateral to
Grantors, or to the Person or Persons legally entitled thereto, and shall
endorse, execute, deliver, record and file all instruments and documents, and do
all other acts and things, reasonably required for the return of the Collateral
to Grantors, or to the Person or Persons legally entitled thereto, and to
evidence or document the release of Secured Party's interests arising under this
Assignment, all as reasonably requested by, and at the reasonable expense of,
Grantors.

                                      -9-
<PAGE>

          11.  Additional Powers and Authorization.  Secured Party shall be
               -----------------------------------
entitled to the benefits accruing to it as Administrative Agent under the Loan
Assignment and the other Loan Documents.  Notwithstanding anything contained
herein to the contrary, Secured Party may employ agents, trustees, or attorneys-
in-fact and may vest any of them with any Property (including, without
limitation, any Collateral assigned hereunder), title, right or power deemed
necessary for the purposes of such appointment.

          12.  WAIVER OF JURY TRIAL.  EACH GRANTOR AND SECURED PARTY EXPRESSLY
               --------------------
WAIVE THEIR RESPECTIVE RIGHTS TO A TRIAL BY JURY OF ANY CLAIM, DEMAND, ACTION OR
CAUSE OF ACTION BASED UPON OR ARISING OUT OF OR RELATED TO THIS ASSIGNMENT, THE
LOAN AGREEMENT, THE OTHER LOAN DOCUMENTS OR THE TRANSACTIONS CONTEMPLATED HEREBY
OR THEREBY IN ANY ACTION, PROCEEDING OR OTHER LITIGATION OF ANY TYPE BROUGHT BY
ANY OF THE PARTIES AGAINST ANY OTHER PARTY OR PARTIES, WHETHER NOW EXISTING OR
HEREAFTER ARISING AND WHETHER WITH RESPECT TO CONTRACT CLAIMS, TORT CLAIMS, OR
OTHERWISE.  EACH GRANTOR AND SECURED PARTY AGREE THAT ANY SUCH CLAIM, DEMAND,
ACTION OR CAUSE OF ACTION SHALL BE TRIED BY A COURT TRIAL WITHOUT A JURY.
WITHOUT LIMITING THE FOREGOING, THE PARTIES FURTHER AGREE THAT THEIR RESPECTIVE
RIGHTS TO A TRIAL BY JURY ARE WAIVED BY OPERATION OF THIS SECTION AS TO ANY
ACTION, COUNTERCLAIM OR OTHER PROCEEDING WHICH SEEKS, IN WHOLE OR IN PART, TO
CHALLENGE THE VALIDITY OR ENFORCEABILITY OF THIS ASSIGNMENT, THE LOAN AGREEMENT
OR THE OTHER LOAN DOCUMENTS OR ANY PROVISION HEREOF OR THEREOF.  THIS WAIVER
SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS, RENEWALS, SUPPLEMENTS OR MODIFICATIONS
TO THIS ASSIGNMENT, THE LOAN AGREEMENT AND THE OTHER LOAN DOCUMENTS.  ANY PARTY
HERETO MAY FILE AN ORIGINAL COUNTERPART OR A COPY OF THIS SECTION WITH ANY COURT
AS WRITTEN EVIDENCE OF THE CONSENT OF THE SIGNATORIES HERETO TO THE WAIVER OF
THEIR RIGHT TO TRIAL BY JURY.

          13.  GOVERNING LAW.  THIS AGREEMENT SHALL BE CONSTRUED AND ENFORCED IN
               -------------
ACCORDANCE WITH AND GOVERNED BY THE FEDERAL LAWS OF THE UNITED STATES OF AMERICA
AND THE LAWS OF THE STATE OF CALIFORNIA.

          14.  Miscellaneous.
               -------------

                                      -10-
<PAGE>

               (a) Grantors and Secured Party may from time to time agree in
     writing to the release of certain of the Collateral from the security
     interest created hereby.

               (b) Any notice, request, demand or other communication required
     or permitted under this Assignment shall be in writing and shall be deemed
     to be properly given if done in accordance with Section 11.6 of the Loan
     Agreement.

               (c) Except as otherwise set forth in the Loan Agreement, the
     provisions of this Assignment may not be modified, amended, restated or
     supplemented, whether or not the modification, amendment, restatement or
     supplement is supported by new consideration, except by a written
                                                   ------
     instrument duly executed and delivered by Secured Party and Grantors.

               (d) Except as otherwise set forth in the Loan Agreement or this
     Assignment, any waiver of the terms and conditions of this Assignment, or
     any Event of Default and its consequences hereunder or thereunder, and any
     consent or approval required or permitted by this Assignment to be given,
     may be made or given with, but only with, the written consent of Secured
     Party on such terms and conditions as specified in the written instrument
     granting such waiver, consent or approval.

               (e) Any failure or delay by Secured Party to require strict
     performance by Grantors of any of the provisions, warranties, terms, and
     conditions contained herein, or in any other agreement, document, or
     instrument, shall not affect Secured Party's right to demand strict
     compliance and performance therewith, and any waiver of any default shall
     not waive or affect any other default, whether prior or subsequent thereto,
     and whether of the same or of a different type.  None of the warranties,
     conditions, provisions, and terms contained herein, or in any other
     agreement, document, or instrument, shall be deemed to have been waived by
     any act or knowledge of Secured Party, its agents, officers, or employees,
     but only by an instrument in writing, signed by an officer of Secured Party
     and directed to Grantors, specifying such waiver.

               (f) If any term or provision of this Assignment conflicts with
     any term or provision of the Loan Agreement, the term or provision of the
     Loan Agreement shall control.

                                      -11-
<PAGE>

               (g) If any provision hereof shall be deemed to be invalid by any
     court, such invalidity shall not affect the remainder of this Assignment.

               (h) This Assignment supersedes all prior oral and written
     assignments and agreements between the parties hereto on the subject matter
     hereof.

               (i) This Assignment shall be binding upon, and for the benefit
     of, the parties hereto and their respective legal representatives,
     successors, and assigns.

               (j) This Assignment may be executed in one or more counterparts,
     each of which shall be deemed an original and all of which, taken together,
     shall constitute one and the same agreement.

          IN WITNESS WHEREOF, each of Borrower and Guarantor have executed this
Assignment by its duly authorized officer as of the date first written above.

                                 COAST HOTELS AND CASINOS, INC.,
                                 a Nevada corporation

                                 By:_______________________________

                                 Title: ___________________________

                                 COAST RESORTS, INC.,
                                 a Nevada corporation

                                 By:_______________________________

                                 Title: ___________________________

                                      -12-
<PAGE>

STATE OF CALIFORNIA      )
                         )
COUNTY OF LOS ANGELES    )

On March ___, 1999, before me, _______________________, Notary Public,
personally appeared ___________________________

[_] personally known to me or [_] proved to me on the basis of satisfactory
evidence to be the person whose name is subscribed to the within instrument and
acknowledged to me that he executed the same in his authorized capacity, and
that by his signature on the instrument the person, or the entity upon behalf of
which the person acted, executed the instrument.

WITNESS my hand and official seal.

                                        _________________________________

STATE OF CALIFORNIA      )
                         )
COUNTY OF LOS ANGELES    )

On March___, 1999, before me, _______________________, Notary Public, personally
appeared ___________________________

[_] personally known to me or [_] proved to me on the basis of satisfactory
evidence to be the person whose name is subscribed to the within instrument and
acknowledged to me that he executed the same in his authorized capacity, and
that by his signature on the instrument the person, or the entity upon behalf of
which the person acted, executed the instrument.

WITNESS my hand and official seal.

_________________________________

                                      -13-
<PAGE>

                                   SCHEDULE 1
                                   ----------

                        Existing and Pending Trademarks
                        -------------------------------

<TABLE>
<CAPTION>

                                    Registration          Registration
Mark                        Class      Number           Date         Owner
----                        -----   ------------      --------     ---------
<S>                         <C>     <C>               <C>          <C>
Gone Country                   41      2,123,611      12/23/97     Guarantor
Super Sequential               41      2,163,477      06/08/98     Borrower
Party Poker                    41      2,127,100      01/06/98     Borrower
Cajun Quarters                 41      2,163,476      06/09/98     Borrower
Paycheck Party Machine         41      2,116,281      11/25/97     Borrower
Crawfish Quarters              41      2,127,099      01/06/98     Borrower
</TABLE>

                                  Schedule 1
<PAGE>

                                   EXHIBIT A
                                       TO
                     TRADEMARK SECURITY INTEREST ASSIGNMENT

                             INSTRUMENT OF JOINDER
                             ---------------------

          THIS INSTRUMENT OF JOINDER ("Joinder") is executed as of
_________________, _____, by ______________________________, a
___________________________ ("Joining Party"), and delivered to Bank of America
National Trust and Savings Association, as Administrative Agent, pursuant to the
Trademark Security Interest Assignment (the "Assignment") dated as of March 18,
1999 made by Coast Hotels and Casinos, Inc. and Coast Resorts, Inc. in favor of
the Administrative Agent and the Lenders (the "Assignment").  Terms used but not
defined in this Joinder shall have the meanings defined for those terms in the
Assignment.

                                    RECITALS
                                    --------

          (A) The Assignment was made by the Grantors in favor of the
Administrative Agent for the benefit of the Lenders that are parties to that
certain Loan Agreement dated as of March 18, 1999 by and among Coast Hotels and
Casinos, Inc., a Nevada corporation ("Borrower"), the Lenders which are parties
thereto, and Bank of America National Trust and Savings Association, as the
Administrative Agent for the Lenders.

          (B) Joining Party has become a Subsidiary of Borrower, and as such is
required pursuant to the Loan Agreement to become a Grantor.

          (C) Joining Party expects to realize direct and indirect benefits as a
result of the availability of the credit facilities under the Loan Agreement to
Borrower.

          NOW THEREFORE, Joining Party agrees as follows:

                                   AGREEMENT
                                   ---------

          (1) By this Joinder, Joining Party becomes a "Grantor" under and
pursuant to Section 9 of the Assignment.  Joining Party agrees that, upon its
execution hereof, it will become a Grantor under the Assignment with respect to
all Obligations of Borrower heretofore or hereafter incurred under the Loan
Documents, and will be bound by all terms, conditions, and duties applicable to
a Grantor under the Assignment.
<PAGE>

          (2) The effective date of this Joinder is _________, _____.

                                    "Joining Party"

                                    ______________________________,
                                    a _____________________________

                                    By:____________________________

                                    Title:_________________________

ACKNOWLEDGED:

BANK OF AMERICA NATIONAL TRUST
AND SAVINGS ASSOCIATION,
as Administrative Agent

By:__________________________

Title:_______________________<PAGE>

                                                                   Exhibit 10.81

                                                       Standard [LOGO] Chartered

                                                       Standard Chartered Bank
                                                       7 World Trade Center
                                                       New York, NY 10048

                                                       Telephone 212-667-0700

December 30, 1999

Tarrant Apparel Group
3151 East Washington Blvd
Los Angeles, CA 90023

Attn: Mr. Patrick Chow, Treasurer

Ladies and Gentlemen:

Standard Chartered Bank (the "Bank") is pleased to make available an uncommitted
line of credit (the "Facility") to Tarrant Apparel Group (the "Borrower") under
the following terms and conditions. This letter agreement shall supersede and
replace all previous letter agreements between the Bank and the Borrower. No
commitment to lend can be assumed or inferred hereby. The purpose of this letter
agreement is to outline the general parameters of the transactions that the Bank
would consider entering into with the Borrower from time to time.

1.    AMOUNT:

                  An aggregate principal amount at any time outstanding of up to
                  USD10,000,000 (the "Aggregate Exposure") may be made available
                  for the advances ("Advances") for periods up to but not
                  exceeding 90 days for general corporate purposes, and in any
                  event shall be available at the Bank's sole discretion.

2.    AVAILABILITY:

                  The Bank may terminate the Facility at any time in its sole
                  discretion and with immediate effect by written notice to the
                  Borrower. The Bank shall at all times reserve the right to
                  alter the terms of the facility

3.    INTEREST AND FEES:

                  The Borrower agrees to pay the Bank's rate for advances to be
                  determined on the date of transaction as specified in the
                  Promissory Note dated hereof.

4.    TAXES:

                  Payments of all amounts of principal and interest shall be
                  free and clear of and without deduction for any present or
                  future taxes, levies, imposts or duties imposed by any
                  governmental authority in any jurisdiction or political
                  subdivision or taxing authority therein.

                                                                     Page 1 of 5
<PAGE>

                                                       Standard [LOGO] Chartered

5.    DEFAULT INTEREST:

                  The Borrower agrees to pay interest on any amount which is not
                  repaid or paid when due hereunder or under the Promissory Note
                  (whether at stated maturity, by acceleration or otherwise),
                  until paid in full at a rate per annum equal to 5% above the
                  Prime Rate as quoted by the Bank from time to time.

6.    EVIDENCE OF INDEBTEDNESS:

                  The Borrower agrees that the Bank's internal books and
                  records, the Promissory Note and any other documents required
                  by the Bank which are executed and delivered by the Borrower
                  shall be conclusive evidence (absent manifest error) with
                  respect to all interest rates, repayments and repayment dates
                  and of the Borrower's indebtedness to the Bank. In addition,
                  all terms and conditions of the annexed Promissory Note and
                  any other documents executed in connection herewith are
                  incorporated by reference into any credit contemplated
                  hereunder.

7.    Y2K:        The Borrower represents and warrants that it has made a full
                  and complete assessment of the anticipated costs, problems and
                  uncertainties associated with the inability of certain
                  computer applications and systems to effectively handle data,
                  including dates, on and after January 1, 2000 as same may
                  effect the business, operations and financial condition of the
                  Borrower, its customers, suppliers and vendors. The Borrower
                  has a realistic and achievable program for testing and, as
                  needed, reediting its computer applications and systems on a
                  timely basis. Based on their assessment and program, the
                  Borrower does not reasonably anticipate any material adverse
                  effect on its operations, business or financial condition as a
                  result of issues related to bringing its applications and
                  systems into operational compliance on or before January 1,
                  2000.

8.    CONDITIONS PRECEDENT:

                  As a precondition to the Bank's considering to extend the
                  credit contemplated by this letter agreement (but with the
                  Bank retaining full discretion as to whether to extend any
                  credit from time to time), the Borrower shall have executed
                  and delivered to the Bank, in form and substance satisfactory
                  to the Bank, the following documents:

                  (a) Facility Letter: the duplicate copy of this letter
                  agreement and the following documents duly signed by officers
                  empowered to sign on the Borrowers behalf;

                  (b) Corporate Standing: a certificate of the Secretary or
                  Assistant Secretary of the Borrower certifying the incumbency
                  and specimen signatures of the officers of the Borrower
                  executing this letter agreement and each of the related
                  documents and that attached hereto are (i) a true and complete
                  copy of the resolutions of the Borrowers board of directors
                  which authorize the acceptance of the credit and the related
                  obligations contemplated by this letter agreement (which
                  resolutions shall not have been rescinded as of the date of
                  such certification) and (ii) true and complete copies of the
                  Borrower's articles or certificate of incorporation and all
                  amendments thereto as in effect as of the date of such
                  certification;

                  (c) Promissory Note in the Bank's form duly executed by
                  officers empowered to sign on the Borrower's behalf; and

                                                                     Page 2 of 5
<PAGE>

                                                       Standard [LOGO] Chartered

                  (d) Any and all other documents that the Bank may reasonably
                  request from time to time.

9.    REPRESENTATIONS AND WARRANTIES:

                  The Borrower represents and warrants to the Bank that the
                  following statements are true and accurate as of the date
                  hereof and shall be true and accurate as of the date of the
                  disbursement of any credit contemplated hereunder, except as
                  communicated to and approved by the Bank in writing.

                  (i)   The Borrower is a corporation duly organized, validly
                        existing and in good standing under the laws of the
                        state of its incorporation and is fully qualified to do
                        business wherever such qualification is necessary. The
                        Borrower has full corporate power and authority to
                        execute this letter and incur the obligations and
                        indebtedness contemplated hereunder. The execution,
                        delivery and performance by the Borrower of its
                        obligations contemplated herein will not contravene any
                        law, regulation, by-law or contractual obligations
                        binding upon the Borrower;

                  (ii)  The Borrower's obligation contemplated hereunder
                        constitutes the Borrower's valid and legally binding
                        obligation enforceable against the Borrower in
                        accordance with its terms, except as the enforceability
                        thereof may be limited by applicable bankruptcy,
                        insolvency, reorganization, moratorium or similar laws
                        affecting the enforcement of creditor's rights generally
                        and by general principles of equity and has been duly
                        authorized by the Borrower's board of directors; and

                  (iii) To the best knowledge of the Borrower, there are no
                        pending or threatened actions or proceedings before any
                        court or administrative agency which, if determined
                        adversely, would materially affect the financial
                        condition or operations of the Borrower.

10.   COVENANTS:

                  The Borrower hereby agrees that, as long as any Facility
                  remains outstanding and unpaid, the Borrower shall:

                  (i)   provide the Bank audited annual consolidated financial
                        statements (including consolidating schedules), prepared
                        in accordance with GAAP, within 90 days of the end of
                        the Borrower's fiscal year end;

                  (ii)  submit to the Bank management prepared audited
                        consolidated quarterly financial statements, prepared in
                        accordance with GAAP, within 45 days of the end of the
                        Borrowers' fiscal quarter.

11.   RIGHT OF SET-OFF:

                  In addition to the rights granted to it by applicable law, the
                  Bank has the right to set-off and apply to any of the
                  Borrower's obligations hereunder any amount received by it
                  from the Borrower, including any balance in any deposit
                  account of the Borrower maintained with the Bank or any of its
                  branches.

                                                                     Page 3 of 5
<PAGE>

                                                       Standard [LOGO] Chartered

12.   ASSIGNMENTS:

                  The Bank may at any time assign or sell participation in all
                  or a portion of its rights and obligations hereunder to one or
                  more banks or other financial institutions. The Borrower shall
                  not assign or delegate any of its rights or obligations
                  hereunder without the prior written consent of the Bank and
                  any attempted assignment by the Borrower without such consent
                  shall be null and void.

13.   LEGAL FEES AND EXPENSES:

                  The Borrower agrees to pay to the Bank on its first demand all
                  costs and expenses incurred by the Bank in connection with the
                  preparation, execution and/or amendment of this letter
                  agreement and the enforcement or collection of any obligations
                  arising in connection with the transactions contemplated
                  hereby, including, without limitation, reasonable attorneys'
                  fees, a reasonable estimate of the allocated cost of Bank's
                  in-house counsel and other legal expenses.

14.   WAIVERS:

                  The failure of the Bank at any time to require performance by
                  the Borrower of any provisions hereof shall in no way affect
                  the Bank's rights to require such performance at any time
                  thereafter, nor shall the waiver by the Bank of the breach of
                  any provision hereof be taken or held to be a waiver or
                  modification of any succeeding breach of such provision. No
                  modification or waiver of any provisions of this letter
                  agreement shall be effective unless in writing, signed by the
                  Bank, and only to the extent specifically set forth therein;
                  nor shall any such waiver or modification be applicable except
                  in the specific instance for which given.

15.   GOVERNING LAW; WAIVER OF TRAIL BY JURY; CONSENT TO JURISDICTION:

                  The Borrower agrees that any legal action arising out of or in
                  any connection with this letter agreement or bankers'
                  acceptances, overdrafts or letters of credit may be brought by
                  the Bank, in its discretion, in the State or Federal Courts
                  located in New York City and the Borrower waives the right to
                  trail by jury in any action or proceeding related hereto or in
                  connection with the obligations undertaken hereby and in the
                  security documents related hereto.

                  THE BORROWER'S OBLIGATIONS WITH RESPECT TO THIS LETTER
                  AGREEMENT AND THE OBLIGATIONS CONTEMPLATED HEREUNDER SHALL BE
                  GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE
                  STATE OF NEW YORK.

                                                                     Page 4 of 5
<PAGE>

                                                       Standard [LOGO] Chartered

If the terms and conditions specified in this letter agreement are acceptable to
you, please indicate your acceptance thereof by signing and returning the
attached copy to us.

Very truly yours,
STANDARD CHARTERED BANK

By: /s/ Andrew Y. Ng                         By: /s/ Larry Fitzgerald
   -----------------------------                --------------------------------
Name:  Andrew Y. Ng                          Name:  Larry Fitzgerald
Title: Vice President                        Title: Vice President

Agreed to and accepted by:
TARRANT APPAREL GROUP

By: /s/ Gerard Guez                          By:
   -----------------------------                --------------------------------
Name: Gerard Guez                            Name:
Title: Chief Executive Officer               Title:
Date: 1-13-00                                Date:

                                                                     Page 5 of 5

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