Document:

Exhibit 10.13

                       ASSIGNMENT AND ASSUMPTION OF LEASE

     THIS ASSIGNMENT AND ASSUMPTION OF LEASE ("Assignment") entered into
effective as of the 3rd day of October, 2003, by McCARTER & ENGLISH, LLP, a New
Jersey limited liability partnership, having an address of Four Gateway Center,
100 Mulberry Street, Newark, New Jersey 07102 ("Assignor") and GREENHILL & CO.,
LLC, a New York limited liability company, with an address of 300 Park Avenue,
23rd Floor, New York, New York 10022 ("Assignee")

                              W I T N E S S E T H:

     WHEREAS TST 300 Park, L.P. ("Landlord") and Assignor entered into that
certain lease, dated as of April 21, 2000 (the "Lease"), a true and complete
copy of which is attached hereto as Exhibit A, with respect to those certain
premises consisting of the entire eighteenth floor of the Building located at
300 Park Avenue, New York, New York, all as more fully described in the Lease
(the "Leased Premises"); and

     WHEREAS Assignor desires to assign the Lease and the leasehold estate
created thereunder to Assignee and, subject to the terms and conditions hereof,
Assignee desires to assume the obligations of Assignor, as tenant under the
Lease, all in accordance with the terms and conditions hereinafter set forth.

     NOW, THEREFORE, in consideration of the covenants and agreements
hereinafter set forth and for other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, Assignor and Assignee covenant
and agree as follows:

     1. Capitalized terms not defined herein shall have the meaning as set forth
in the Lease.

     2. Assignor intends, and hereby agrees to act in good faith, to deliver
possession of the Leased Premises to Assignee as of November 3, 2003; provided,
however, the date that Assignor actually delivers possession of the Leased
Premises to Assignee, in accordance with the terms and provisions set forth in
this Assignment, including but not limited to Section 12 below, shall be the
"Assignment Date". As of the Assignment Date; (i) Assignor hereby assigns,
transfers and conveys to Assignee the leasehold estate and all of its right,
title and interest as tenant in, to, and under the Lease; and (ii) Assignee
hereby accepts the assignment of the Lease, and the leasehold estate created
thereunder, by Assignor and assumes, absolutely and irrevocably, and agrees to
be bound by all the terms, covenants, provisions, and conditions of the Lease.

          a. Except as set forth in Subsection 2(b) below, Assignee acknowledges
and agrees that the Leased Premises are being assigned to it in an "AS-IS",
"WHERE-IS" condition.

          b. Notwithstanding anything to the contrary herein, if during the
first six (6) months of the term of this Assignment Assignee discovers the
presence of asbestos (which asbestos were present in or on the Leased Premises
prior to the Assignment Date), then Assignor shall, within forty-five days of
Assignee's written request therefor, reimburse Assignee for the reasonable
out-of-pocket costs and expenses incurred by Assignee to encapsulate such
asbestos; provided, however, Assignee hereby agrees to pay the first $15,000 of
costs and expenses for such encapsulation.

     3. Notwithstanding anything contained in this Agreement to the contrary,
Assignor hereby indemnities and agrees to hold Assignee harmless from and
against any loss, damage, liability, cost or expenses (including reasonable
attorneys' fees and court costs) resulting to Assignee by virtue of the failure
by Assignor to perform or comply with any term, covenant, or condition of the
Lease required to be performed or complied with, or any other matter accruing
under the Lease, prior to the Assignment Date. Notwithstanding anything
contained in this Agreement to the contrary, Assignee hereby indemnifies and
agrees to hold Assignor harmless from and against any loss, damage, liability,
cost or expenses (including reasonable attorneys' fees and court costs)
resulting to Assignor by virtue of Assignee's failure to perform or comply with
any term, covenant, or condition of the Lease required to be performed or
complied with, or any other matter accruing under the Lease, on or after the
Assignment Date (including, without limitation, during any period beyond the
original term of the Lease, whether as the result of a holdover, an extension or
modification of the Lease, or otherwise).

     4. Assignee acknowledges and agrees that the assignment effectuated hereby,
together with the Consent of Landlord to be obtained in accordance with the
provisions of Section 6 hereof, shall release and relieve Assignor from any
liability or obligation to Landlord under the provisions, covenants and
conditions of the Lease to the extent the same may arise on or after the
Assignment Date; provided, however, nothing in this Section 4 or in Paragraph 9
of the Landlord's Consent to Assignment and Amendment to Lease shall limit
Assignor's liabilities or obligations to Assignee as set forth in this
Assignment.

     5. Assignor represents and warrants that the amount of the Security Deposit
presently held by the Landlord is $1,550,000 in the form of a letter of credit
(the "Existing Letter of Credit"). Assignee shall be responsible for providing
Landlord with a substitute letter of credit satisfying the provisions of Article
35 of the Lease on the Assignment Date (as more fully set forth in that certain
Consent to Assignment and Amendment to Lease, dated on or about even date
herewith, and by and between Landlord, Assignor and Assignee).

     6. This Assignment is subject to, and shall become effective only upon the
written consent of Landlord to the making of this Assignment, in the form
attached hereto as Exhibit B.

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     7. In consideration of Assignee entering into this Assignment and assuming
the obligations of the Tenant under the Lease, Assignor agrees to pay to
Assignee the following;

     (a)  A construction allowance of $58,125.00 (less a credit for Base Rent
          paid by Assignor for the remaining days in the current month), payable
          on or before the Assignment Date.

     (b)  The sum of $322,109.37, payable in three (3) equal monthly
          installments of 107,369.79, which installments shall be payable (i) on
          the first day of the first month following the Assignment Date, (ii)
          on the first day of the second month following the Assignment Date,
          and (iii) on the first day of the third month following the Assignment
          Date.

     (c)  The following amounts in order to reimburse Assignee for a portion of
          the Fixed Rent due under the Lease as follows:

          (i)  Monthly installments of $18,567.71 commencing upon the first day
               of the fourth month following Assignment Date, and continuing
               until the earlier to occur of (l) the July 1, 2005 or (2) any
               earlier termination of the Lease.

          (ii) Monthly installments of $28,255.21 commencing on July 1, 2005 and
               continuing until the earlier to occur of (1) the day immediately
               preceding the fourth anniversary of the Assignment Date or (2)
               any earlier termination of the Lease.

          (iii) Monthly installments of $25,026.04 commencing on the fourth
               anniversary of the Assignment Date and continuing until the
               earlier to occur of (1) the Expiration Date for the initial Term
               of the Lease of July 31, 2010, or (2) any earlier termination of
               the Lease.

     (d)  Monthly payments equal to one-twelfth (1/12th) of the lesser of (i)
          Tenant's Proportionate Share of the increase in Taxes for the
          2003/2004 Comparison Year over the Base Taxes, or (ii) in the event
          Taxes for any Lease Year are less than the Taxes for the 2003/2004
          Comparison Year, Tenant's Proportionate Share of the increase in Taxes
          for such Comparison Year over the Base Taxes ("Assignor's Tax
          Contribution"). Assignor's Tax Contribution shall be payable to
          Assignee on or prior to the first day of each month commencing upon
          the first day of the first month following Assignment Date, and
          continuing until the earlier to occur of (i) the Expiration Date of
          the initial Term of the Lease on July 31, 2010 or (ii) any earlier
          termination of the Lease. Monthly payments shall

                                       3

          be based upon Landlord's estimate of Tenant's Tax Payments as set
          forth in Section 8.2 of the Lease, and shall be subject to annual
          reconciliation within ten (10) Business Days after each annual
          Statement of Taxes is provided to Assignor.

     (e)  Monthly payments equal to one-twelfth (1/12th) of the lesser of (i)
          Tenant's Proportionate Share of the increase in Operating Expenses for
          the 2003 Comparison Year over the Base Operating Expenses, or (ii) in
          the event Operating Expenses for any Comparison Year (as defined in
          the Lease) are less than the Operating Expenses for the 2003
          Comparison Year, Tenant's Proportionate Share of the increase in
          Operating Expenses for such Comparison Year over the Base Operating
          Expenses ("Assignor's Operating Expense Contribution"). Assignor's
          Operating Expense Contribution shall payable to Assignee on or prior
          to the first day of each month commencing upon the first day of the
          first month following Assignment Date, and continuing until the
          earlier to occur of (i) the Expiration Date of the initial Term of the
          Lease on July 31, 2010 or (ii) any earlier termination of the Lease.
          Monthly payments shall be based upon Landlord's estimate of Tenant's
          Operating Payment as set forth in Section 8.3 of the Lease, and shall
          be subject to annual reconciliation within ten (10) Business Days
          after each annual Statement of Taxes is provided to Assignor.

     (f)  In the event Assignor does not deliver possession of the Leased
          Premises to Assignee on or before December 3, 2003, then Assignor
          hereby agrees to pay to Assignee a sum equal to $4,440 per day for
          each day after December 3, 2003 that Assignor does not deliver
          possession of the Leased Premises to Assignee, with at least twenty
          (20) days prior written notice to Assignee of the delivery date.

     8. Assignor and Assignee each warrants and represents to the other that it
had no dealing with any broker or finder concerning this Assignment other than
CBRE Real Estate Services, Inc. and The Garibaldi Group in cooperation with The
Staubach Company (collectively, the "Brokers"). Each party hereto agrees to
indemnify and hold the other party harmless from any and all liabilities and
expenses, including, without limitation, reasonable attorneys' fees and
disbursements, arising out of claims against the other party by any other
broker, consultant, finder or like agent claiming to have brought about this
Assignment based upon the alleged acts of the indemnifying party. Assignor shall
be responsible for any commissions and fees owed to Brokers in connection with
this Assignment and its negotiation pursuant to a separate agreement between
Assignor and/or Assignee and Brokers.

     9. This Assignment shall be construed and enforced in accordance with the
laws of the State of New York. Assignee and Assignor agree that any

                                       4

action or proceeding brought to enforce any provision of this Assignment shall
be brought in the courts of the State of New York.

     10. Assignor represents and warrants to Assignee that (a) Assignor is the
holder of the tenant's interest in the Lease, (b) Assignor's interest as tenant
under the Lease has not been pledged or otherwise assigned to any other party,
(c) Exhibit A contains a true and complete copy of the Lease and any amendments
thereto, and (d) all rent due and payable under the Lease has been paid by
Assignee through the date hereof, (e) Assignee has receive no notice from
Landlord that Assignor is in default of any of its obligations under the Lease,
and (f) Assignor has not exercised its renewal option as provided in Article 37
of the Lease.

     11. Assignor covenants, represents and warrants to Assignee that, as of the
date hereof, and through the Assignment Date:

          a. Assignor is in, and shall be in compliance with all Requirements
applicable to the Leased Premises, as more fully set forth in Section 9.1(a) of
the Lease; and

          b. Tenant has not and shall not (i) cause or permit any Hazardous
Materials to be brought into the Building, (ii) cause or permit the storage or
use of the Hazardous Materials in any manner not permitted by any Requirements,
or (iii) cause or permit the escape, disposal or release of any Hazardous
Material within the vicinity of the Building.

     12. Assignor therefore agrees if Assignor can not deliver the Leased
Premises to Assignee on or before November 3, 2003, then the Assignment Date
shall be made effective as of the date which Assignor actually delivers
possession to Assignee (which date shall not be less than 20 days after Assignee
receives written notice that Assignor is able to deliver possession on such
date). Further, notwithstanding anything to the contrary herein, if Assignor is
unable to deliver the Leased Premises to Assignee on or before December 31,
2003, then Assignee may terminate this Assignment (and retain the monetary
payments set forth in Section 7(b) above) with written notice to Assignor.

     13. Each of the following events shall be an "Event of Default" hereunder:

          a. Assignor fails to pay when due any monetary payment required under
this Assignment and such default continues for five Business Days after notice
of such default is given to Assignor, except that if Tenant shall have given two
such notices of default in the payment of any monetary payment in any twelve
month period, Assignor shall not be entitled to any further notice of
delinquency in the payment of any monetary payment or an extended period in
which to make payment until such time as twelve consecutive months have elapsed
without Assignor having failed to make ay such payment when due, and

                                       5

the occurrence of any default in the payment of any monetary payment within such
twelve month period after giving of two such notices shall constitute and Event
of Default; or

          b. Assignor defaults in the observance or performance of any other
term, covenant, condition of this Assignment to be observed or performed by
Assignor and such default continues for more than 20 days after notice by
Assignee of such default; or

          c. Assignor's interest in this Assignment shall devolve upon or pass
to any Person, whether by operation of law or otherwise (provided, however,
Assignor may merge with another entity so long as (i) Assignee is provided
notice thereof and (ii) such new entity is liable hereunder); or

          d. Assignor generally does not, or is unable to, or admits in writing
its inability to, pay its debts as they become due; or

          e. Assignor files a voluntary petition in bankruptcy or insolvency, or
is adjudicated a bankrupt or insolvent, or files any petition or answer seeking
any reorganization, liquidation, dissolution or similar relief under any present
of future federal bankruptcy act or any other present or future applicable
federal, state or other statute or law, or makes an assignment for the benefit
of creditors or seeks or consents to acquiesces in the appointment of any
trustee, receiver, liquidator or other similar official for Assignor or for all
or part of Assignor's property; or

          f. if, within 60 days after the commencement of any proceeding against
Assignor, whether by the filing of a petition or otherwise, seeking bankruptcy,
insolvency, reorganization, arrangement, composition, readjustment, liquidation,
dissolution or similar relief under the present or any future federal bankruptcy
act or any other present or future applicable federal, state or other statute or
law, such proceeding shall not have been dismissed, or if, within 60 days after
the appointment of any trustee, receiver, liquidator or other similar official
for Assignor or for all or any part of Assignor's property, without the consent
or acquiescence of Assignor, such appointment shall not have been vacated or
otherwise discharged, or if any lien, execution or attachment or other similar
filing shall be made or issued against Assignor or any of Assignor's property
pursuant to which the Leased Premises shall be take or occupied or attempted to
be take or occupied by someone other than Assignor.

     14. If any Event of Default occurs, Assignee shall have the following
rights and remedies:

          a. Assignee shall have the right to accelerate all payments due,
through and including the Expiration Date for the initial Term of the Lease,
under Subsection 7(c)(i)-(iii) of this Assignment, and such payments (less a

                                       6

discount rate of four percent (4%)) shall at once become due and payable and may
be collected forthwith ("Accelerated Monthly Rent Payments");

          b. Assignee shall have the right, as liquidated and agreed damages, to
estimate the payments due under Subsections 7(d) and (e) above by multiplying
the then applicable monthly payment amount under Subsections 7(d) and (e) and
multiplying such monthly payment amount (less a discount rate of four percent
(4%)) by the total months remaining under the initial Term of the Lease
("Liquidated Damages"), and declare such amount due and payable;

          c. Assignor shall pay to Assignee all monetary payments then due and
payable under the terms of this Assignment, the Accelerated Monthly Rent
Payments and Liquidated Damages;

          d. Assignee shall be entitled to draw upon the letter of credit
deposited by Assignor as security, and Assignor shall be entitled to the
proceeds thereof, which monies, shall be applied to the amounts due and owing to
Assignee and against any damages payable by Assignor to Assignee;

          e. Any damages payable under this Assignment and not paid when due
shall bear interest at the Interest Rate from the due date until paid, and the
interest shall be deemed additional payments required hereunder; and

          f. The rights and remedies set forth above are cumulative and shall
not preclude Assignee from invoking any other remedy allowed in law or equity.

     15. a. Assignor shall, within 15 days after the execution of this
Assignment, deliver a clean, irrevocable, non-documentary and unconditional
letter of credit from Wachovia Bank, N.A. or other financial institution and in
form reasonably approved by Assignee ("Letter of Credit"). The Letter of Credit
shall (i) name Assignee as beneficiary, (ii) be in the initial amount of
$1,000,000.00, (iii) have a term of not less than one year, (iv) permit multiple
drawings, (v) be fully transferable by Assignor without the payment of any fees
or charges by Assignee, and (vi) otherwise be in form and content reasonably
satisfactory to Assignee. Subject to the reductions in the face amount of the
Letter of Credit set forth below, the Letter of Credit shall provide that it
shall be deemed automatically renewed, without amendment, for consecutive
periods of one year each thereafter during the Term through the date that is at
least 60 days after the Expiration Date, unless the issuing bank sends notice
("Non-Renewal Notice") to Assignee by certified mail not less than 45 days next
preceding the then expiration date of the letter of credit stating that the
issuing bank has elected not renew the letter of credit. Assignee shall have the
right, upon receipt of the Non-Renewal Notice, to draw the full amount of the
letter of credit, by sight draft on the issuing bank, and shall thereafter hold
or apply the cash proceeds of the letter of credit as permitted by this
Assignment.

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          b. Notwithstanding the above, the Letter of Credit shall provide that
it shall automatically be reduced by the amount of $125,000.00 on each annual
anniversary of the execution of this Assignment, or if no automatic reduction
provision is contained in the Letter of Credit, the Letter of Credit may be
replaced by a new Letter of Credit for such reduced amount or an amendment to
the existing Letter of Credit reducing the face amount thereof. Upon delivery to
Landlord of a replacement Letter of Credit in such reduced face amount, but
meeting all of the other requirements set forth above, the then existing Letter
of Credit will be returned to Tenant.

          c. Assignor shall annually make available for Assignee's inspection
such financial statements and information as reasonably required by Assignee in
order for Assignee to determine Assignor's ability to perform Assignor's
obligations hereunder.

          d. Notwithstanding anything to the contrary herein, if within 30 days
of the date of this Assignment Assignor fails to deliver the Letter of Credit,
then Assignee may terminate this Assignment with written notice to Assignor.

     16. In the event that Landlord seeks reimbursement (from either Assignee or
Assignor) for the costs and expenses incurred by Landlord in connection with
this Assignment, Assignor and Assignee hereby agree to equally (i.e. 50/50)
split responsibility for such costs and expenses.

     17. This Assignment may be executed in counterparts, each of which shall be
deemed an original, but all of which together shall constitute one and the same
instrument. The parties hereto may execute and deliver this Assignment by
forwarding facsimile, telefax, or other means of copies of this Assignment
showing execution by the parties sending the same, and the parties agree and
intend that such signature shall have the same effect as an original signature,
that the parties shall be bound by such means of execution and delivery, and
that the parties hereby waive any defense to validity based on any such copies
or signatures.

     18. This Assignment shall be binding upon and inure to the benefit of the
parties hereto and their respective successors and assigns.

              [The remainder of this page intentionally left blank]

                                       8

     IN WITNESS WHEREOF, the undersigned have executed this document effective
as of the date and year first above written.

                                        ASSIGNOR:

                                        McCARTER & ENGLISH, LLP

                                        By: /s/Andrew T. Berry
                                            ------------------------------------
                                        Name: Andrew T. Berry
                                        Title: Chairman, Executive Committee

                                        ASSIGNEE:

                                        GREENHILL & CO., LLC

                                        By: /s/Harold J. Rodriguez, Jr.
                                            ------------------------------------
                                        Name: Harold J. Rodriguez, Jr.
                                        Title: Chief Financial Officer

                                       9

                                    EXHIBIT A
                                     [LEASE]

                                       10Exhibit 10.14

                               SUBLEASE AGREEMENT

     THIS SUBLEASE AGREEMENT ("Agreement"), dated as of the date below and
effective as of January 1, 2004, is entered into by Greenhill Aviation Co., LLC,
a New York limited liability company, with offices located at Westchester County
Airport, 16 Hangar Road, White Plains, New York 10604 ("Permittee"), and
Riversville Aircraft Corporation, a New York corporation ("Tenant"):

                                   BACKGROUND

     Pursuant to that certain Hangar and Office/Shop Use Permit dated as of June
25, 2003 ("Permit") between Signature Flight Support Corporation ("Signature")
and Permittee, Signature has authorized Permittee to use and occupy hangar space
of approximately 7,100 square feet in Signature's C-2 hangar storage facility
(the "Permitted Space"). Capitalized terms not defined herein shall have the
meaning attributable to them in the Permit.

     Tenant desires to sublease 2,521 square feet of the Permitted Space (the
"Sublease Space") to be used and occupied by Tenant for the storage of its
Pilatus aircraft, registration number N922RG. Permittee desires to sublease the
Sublease Space to Tenant, subject to the Permit.

     The parties agree as follows:

     1. Lease of Sublease Space. Subject to the Permit, Permittee hereby
subleases to Tenant the Sublease Space. Notwithstanding anything to the contrary
contained herein, Tenant accepts the Sublease Space "AS IS, WHERE IS AND WITH
ALL FAULTS."

     2. Permitted Use. Tenant may use the Sublease Space for any other use
permitted under the Permit and applicable law. Subject to the terms and
conditions of the Permit. Tenant agrees to comply with all applicable
governmental laws, rules, statutes and regulations, relating to its use of the
Sublease Space.

     3. Term.

          A. The term of this Agreement shall commence on the date herein below
     written, and shall terminate on June 30, 2006 (the "Term"), provided that
     Permittee and Tenant may terminate this Agreement upon 30 days prior
     written notice to the other party.

          B. Notwithstanding anything to the contrary herein, Tenant hereby
     acknowledges and agrees that it shall not have the right to possession of
     the Sublease Space beyond the term of the Permit, and this Agreement shall
     immediately terminate upon the termination or cancellation of the Permit.
     If Tenant remains in possession of the Sublease Space after the termination
     or expiration of this Agreement, then Tenant will be deemed to be occupying
     the Sublease Space on a month-to-month basis as a holdover tenant, subject
     to the terms and conditions of this Agreement and the Permit (including
     holdover rent).

     4. Rent; Additional Rent.

          A. Commencing on the date of this Agreement (the Commencement Date"),
     Tenant will pay the Permittee, on or before the first (1st) day of each
     calendar month in advance, to Permittee, at the address set forth above,
     the amount of three thousand nine hundred dollars ($3,900).

          B. Commencing on the Commencement Date, Tenant will be responsible to
     pay, as additional rent, any and all expenses and costs arising out of
     Tenant's use of the Sublease Space.

     5. Approvals. Tenant, at Tenant's sole cost and expense, shall obtain and
maintain during the entire Term of the Permit all governmental licenses,
permits, approvals or other relief required of or deemed necessary by Tenant for
its use of the Sublease Space, including without limitation applications for
zoning variances, zoning ordinances, amendments, special use permits, and
construction permits (collectively referred to as "Governmental Approvals").
Permittee agrees to reasonably assist Tenant with such applications at no cost
to Permittee or Signature.

     6. Indemnification and Insurance.

          A. Tenant agrees to indemnify, defend and hold Permittee harmless from
     and against any injury, loss, damage or liability (or any claims in respect
     of the foregoing), costs or expenses (including reasonable attorneys' fees
     and court costs) arising directly from the installation, use, maintenance
     or repair of the Sublease Space or the breach of any provision of this
     Agreement, except to the extent attributable to the gross negligence or
     willful misconduct of Permittee, its employees or agents.

          B. Tenant shall comply with all insurance requirements set forth in
     the Permit. Tenant shall name Permittee and Signature as additional
     insureds on all insurance policies required under the Permit.

     7. Warranties.

          A. Tenant and Permittee each acknowledge and represent that it is duly
     organized, validly existing and in good standing and has the right, power
     and authority to enter into this Agreement and bind itself hereto through
     the party set forth as signatory for the party below.

          B. Permittee represents and warrants that as long as Tenant is not in
     default, then Permittee grants to Tenant sole, actual, quiet and peaceful
     use, enjoyment and possession of the Sublease Space.

     8. Environmental.

          A. Tenant will be responsible for compliance with any and all
     environmental and industrial hygiene laws, including any regulations,
     guidelines, standards, or policies of any governmental authorities
     regulating or imposing standards of liability or standards of conduct with
     regard to any environmental or industrial hygiene condition or matters as

                                      -2-

     may now or at any time hereafter be in effect, that are now or were related
     to Tenant's activity conducted in, or on, the Sublease Space.

          B. Tenant agrees to hold harmless and indemnify Permittee and
     Signature from and to assume all duties, responsibilities, and liabilities
     at its sole cost and expense, for all duties, responsibilities and
     liability (for payment of penalties, sanctions, forfeitures, losses, costs,
     or damages), and for responding to any action, notice, claim, order,
     summons, citation, directive, litigation, investigation or proceeding which
     is related to Environmental Damages, as defined in Section 10b of the
     Permit, that arise directly or indirectly in connection with the presence,
     suspected presence, relapse or suspected or threatened release of any
     Hazardous and Regulated Substances arising from or caused by Tenant's use
     of the Hangar.

          C. To Permittee's current actual knowledge, neither Permittee nor any
     third party has generated, disposed of, released, nor found any hazardous
     materials on or about the Sublease Space in violation of any environmental
     laws. It is understood by Tenant, however, that Permittee has not made any
     independent investigations to confirm the accuracy of the foregoing
     representation.

     9. Tenant shall have access to the Sublease Space under the same terms and
conditions set forth in the Permit.

     10. Removal. All personal property brought onto the Sublease Space by
Tenant will be and remain Tenant's personal property and, at Tenant's option,
may be removed by Tenant at any time during the Term; provided, that Tenant, at
its own cost, repairs any damages. Any alterations or improvements made by
Tenant to the Sublease Space shall be removed by Tenant prior to the end of the
Term and Tenant will restore the Sublease Space to its original condition.

     11. Maintenance; Utilities.

          A. Tenant will keep and maintain the Sublease Space in good condition,
     reasonable wear and tear excepted.

          B. Tenant will be responsible for an annual payment of its
     proportionate share, equal to thirty percent (30%), of any maintenance or
     utilities charged to Permittee.

     12. Default and Right to Cure.

          A. The following will be deemed a default by Tenant and a breach of
     this Agreement: (i) nonpayment of Rent if such rents remain unpaid for more
     than ten (10) days after the first day of each month; or (ii) Tenant's
     failure to perform any other term or condition under this Agreement or
     under the Permit within thirty (30) days after receipt of written notice
     from Permittee or Signature specifying the failure. If Tenant remains in
     default beyond any applicable cure period, Permittee will have the right to
     exercise any and all rights and remedies available to it under law and
     equity, including the right to cure Tenant's default and to deduct the
     costs of cure from any moneys owed to Permittee by Tenant.

                                      -3-

          B. The following will be deemed a default by Permittee and a breach of
     this Agreement. Permittee's failure to perform any term or condition under
     this Agreement within forty-five (45) days after receipt of written notice
     from Tenant specifying the failure. No such failure, however, will be
     deemed to exist if Permittee has commenced to cure the default within such
     period and provided such efforts are prosecuted to completion with
     reasonable diligence. Delay in curing a default will be excused if due to
     causes beyond the reasonable control of Permittee. If Permittee remains in
     default beyond any applicable cure period, Tenant will have the right to
     exercise any and all rights available to it under law and equity.

     13. Assignment/Sublease. Tenant may not assign or sublease this Agreement,
in whole or in part, without Permittee's and Signature's consent, which may be
withheld in each such parties sole discretion.

     14. Notices. All notices, requests, demands and communications hereunder
will be given by first class certified or registered mail, return receipt
requested, or by a recognized overnight courier, postage prepaid, to be
effective when properly sent and received, refused or returned undelivered.
Notice will be addressed to the following:

     Tenant:           Riversville Aircraft Corporation

     Permittee:        Greenhill Aviation Co., LLC
                       16 Hangar Road
                       Westchester County Airport
                       White Plains, New York
                       Attn: Mike Telow

                               and

                       Hal Rodriguez
                       300 Park Avenue, 23rd Floor
                       New York, New York 10022

     with a copy to:   Sonnenschein Nath & Rosenthal LLP
                       4520 Main Street, Suite 1100
                       Kansas City, Missouri 64111
                       Attn: Kelly Sullivan-Deady, Esq.

     Signature:        Signature Flight Support Corporation
                       Westchester County Airport
                       White Plains, New York 10604
                       Attn: General Manager

                               and

                       Signature Flight Support Corporation
                       201 South Orange Avenue, Suite 1100
                       Orlando, Florida 32801
                       Attn: Contracts

                                      -4-

     Either party hereto may change the place for the giving of notice to it by
thirty (30) days' written notice to the other party as provided herein.

     15. Severability. If any term or condition of this Agreement is found
unenforceable, the remaining terms and conditions will remain binding upon the
parties as though said unenforceable provision were not contained herein.
However, if the invalid, illegal or unenforceable provision materially affects
this Agreement, then the Agreement may be terminated by either party on ten (10)
days' prior written notice to the other party hereto.

     16. Permit Terms.

          A. This Agreement is subject to and Tenant accepts this Agreement
     subject to all of the terms, covenants, provisions, conditions and
     agreements contained in the Permit. This Agreement shall also be subject to
     and Tenant accepts this Agreement also subject to any amendments and
     supplements to the Permit hereafter made.

          B. This Agreement expressly incorporates by reference, as if set forth
     in full in this Agreement, all of the terms, covenants and conditions of
     the Permit, unless clearly inapplicable.

          C. In the event of and upon the termination or cancellation of the
     Permit by Permittee or Signature pursuant to the terms and provisions
     thereof, this Agreement shall automatically cease and terminate. In such
     event Tenant shall have no claims whatsoever against Permittee or
     Signature.

          D. The terms, conditions and obligations imposed upon Tenant hereunder
     shall be deemed supplementary to all terms, conditions, and obligations of
     the Permit, which Tenant has assumed hereunder. In the event of any
     inconsistency between this Agreement and the Permit, this Agreement shall
     be construed so as to impose on Tenant the obligations of Permittee under
     the Permit, unless such obligation has been expressly altered by the
     provisions of this Agreement.

     17. Miscellaneous.

          A. Amendment; Waiver. This Agreement cannot be amended, modified or
     revised unless done in writing and signed by an authorized agent of the
     Permittee and an authorized agent of the Tenant, with the consent of
     Signature. No provision may be waived except in a writing signed by both
     parties.

          B. Bind and Benefit. The terms and conditions contained in this
     Agreement will be binding upon and will inure to the benefit of the
     parties, their respective heirs, executors, administrators, successors and
     assigns.

          C. Entire Agreement. This Agreement and the exhibits attached hereto,
     all being a part hereof, constitute the entire agreement of the parties
     hereto and will supersede all prior offers, negotiations and agreements.

                                      -5-

          D. Governing Law. This Agreement will be governed by the laws of the
     state in which the Sublease Space are located, without regard to conflicts
     of law.

          E. Interpretation. Unless otherwise specified, the following rules of
     construction and interpretation apply: (i) captions are for convenience and
     reference only and in no way define or limit the construction of the terms
     and conditions hereof; (ii) use of the term "including" will be interpreted
     to mean "including but not limited to"; (iii) whenever a party's consent is
     required under this Agreement, except as otherwise stated in the Agreement
     or as same may be duplicative, such consent will not be unreasonably
     withheld, conditioned or delayed; (iv) exhibits are an integral part of the
     Agreement and are incorporated by reference into this Agreement; (v) use of
     the terms "termination" or "expiration" are interchangeable, and (vi)
     reference to a default will take into consideration any applicable notice,
     grace and cure periods.

                                      -6-

     IN WITNESS WHEREOF, the undersigned have caused this Agreement to be
executed this ______ day of April, 2004.

PERMITTEE:

GREENHILL AVIATION CO., LLC

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

TENANT:

RIVERSVILLE AIRCRAFT CORPORATION

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

                                      -7-

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