EXHIBIT NO. 99.16

                  CAPITAL AUTO RECEIVABLES ASSET TRUST 2007-SN1

                        COLT 2007-SN1 CUSTODIAN AGREEMENT

                                     BETWEEN

                                    GMAC LLC,
                                AS COLT CUSTODIAN

                                       AND

                         CENTRAL ORIGINATING LEASE TRUST

                            DATED AS OF JUNE 7, 2007



                               TABLE OF CONTENTS


                                                                            
1.  Definitions.............................................................   1
2.  Appointment of COLT Custodian; Acknowledgment of Receipt................   1
3.  Maintenance of Records..................................................   2
4.  Duties of COLT Custodian................................................   2
5.  Instructions; Authority to Act..........................................   3
6.  Indemnification by the COLT Custodian...................................   3
7.  Advice of Counsel.......................................................   3
8.  Limitation on Liability of COLT Custodian and Others....................   4
9.  Effective Period, Termination, and Amendment; Interpretive and
    Additional Provisions...................................................   4
10. Governing Law...........................................................   6
11. Notices.................................................................   6
12. Binding Effect..........................................................   6
13. Severability of Provisions..............................................   6
14. Assignment..............................................................   6
15. Headings................................................................   6
16. Counterparts............................................................   6
17. No Third-Party Beneficiaries............................................   6
18. Merger and Integration..................................................   7
19. Series Liabilities......................................................   7
20. No Bankruptcy Petition..................................................   7
21. Limitation of Liability.................................................   7
22. Merger and Consolidation of the COLT Custodian..........................   7



                                      -i-



     THIS COLT 2007-SN1 CUSTODIAN AGREEMENT, dated as of June 7, 2007 (this
"COLT Custodian Agreement"), is made between GMAC LLC, a Delaware limited
liability company ("GMAC"), as COLT Custodian (in such capacity, the "COLT
Custodian"), and CENTRAL ORIGINATING LEASE TRUST, a Delaware statutory trust
("COLT").

     WHEREAS, simultaneously herewith GMAC (in its capacity as seller of the
Series 2007-SN1 Lease Assets, the "Seller"), and COLT are entering into a COLT
Sale and Contribution Agreement, dated as of the date hereof (as it may be
amended, supplemented or modified from time to time, the "COLT Sale and
Contribution Agreement"), pursuant to which GMAC shall sell, transfer and
assign, as of the Series 2007-SN1 Closing Date, to COLT without recourse all of
its right, title and interest in and to the Series 2007-SN1 Lease Assets;

     WHEREAS, in connection with such sale, transfer and assignment of the
Series 2007-SN1 Lease Assets, the COLT Sale and Contribution Agreement provides
that COLT shall simultaneously enter into a custodian agreement pursuant to
which COLT shall revocably appoint the COLT Custodian as custodian of the Series
2007-SN1 Lease Asset Files pertaining to the Series 2007-SN1 Lease Assets; and

     WHEREAS, in connection with such sale, transfer and assignment, COLT
desires for the COLT Custodian to act as custodian of the Series 2007-SN1 Lease
Assets;

     NOW, THEREFORE, in consideration of the mutual agreements herein contained
and of other good and valuable consideration the receipt and adequacy of which
are hereby acknowledged, the parties agree as follows:

          1. Definitions. Capitalized terms used in this COLT Custodian
     Agreement are defined in and shall have the meanings assigned to them in
     the COLT Series Definitions attached as Part I of Exhibit A to the COLT
     Servicing Agreement, dated as of the date hereof (as it may be amended from
     time to time, the "COLT Servicing Agreement"), between COLT, GMAC, as
     servicer (in such capacity, the "Servicer"), and The Bank of New York Trust
     Company, N.A., as indenture trustee (in such capacity, the "COLT Indenture
     Trustee"), or if not defined therein, shall have the meanings assigned to
     them in the COLT Program Definitions attached as Exhibit I to the
     Declaration of Trust, dated as of December 13, 2006 (as it may be amended
     from time to time, the "Declaration of Trust"), by Deutsche Bank Trust
     Company Delaware, as COLT Owner Trustee, and acknowledged, accepted and
     agreed by Central Originating Lease, LLC, as Residual Certificateholder.
     All references herein to "this COLT Custodian Agreement" are to this COLT
     Custodian Agreement as it may be amended, supplemented or otherwise
     modified from time to time.

          2. Appointment of COLT Custodian; Acknowledgment of Receipt. Subject
     to the terms and conditions hereof, COLT hereby appoints the COLT
     Custodian, and the COLT Custodian hereby accepts such appointment, to act
     as agent of COLT as COLT Custodian to maintain custody of the Series
     2007-SN1 Lease Asset Files pertaining to the Series 2007-SN1 Lease Assets.
     The COLT Custodian acknowledges that COLT has

                                                             Custodian Agreement
                                                                 (COLT 2007-SN1)



     pledged the Vehicles related to the Series 2007-SN1 Lease Assets to the
     COLT 2007-SN1 Secured Noteholders and has pledged the remainder of the COLT
     2007-SN1 Collateral to the COLT Indenture Trustee under the COLT Indenture
     for the equal and ratable benefit of the COLT 2007-SN1 Secured Noteholders
     and agrees to hold the Series 2007-SN1 Lease Assets on behalf of the Series
     2007-SN1 Further Holders. In performing its duties hereunder, the COLT
     Custodian agrees to act with reasonable care, using that degree of skill
     and attention that the COLT Custodian exercises with respect to automotive
     lease files relating to comparable automotive leases that the COLT
     Custodian services and holds for itself or others. The COLT Custodian
     hereby acknowledges receipt of the Series 2007-SN1 Lease Asset File for
     each Series 2007-SN1 Lease Asset listed on the Series 2007-SN1 Lease Assets
     Schedule.

          3. Maintenance of Records. The COLT Custodian agrees to maintain each
     Series 2007-SN1 Lease Asset File at one of its branch offices or with third
     party vendors as shall be deemed appropriate by the COLT Custodian.

          4. Duties of COLT Custodian.

               (a) Safekeeping. The COLT Custodian shall hold each Series
     2007-SN1 Lease Asset File described herein on behalf of the Series 2007-SN1
     Further Holders and shall maintain such accurate and complete accounts,
     records and computer systems pertaining to each Series 2007-SN1 Lease Asset
     described herein as shall enable COLT to comply with its obligations under
     the COLT Sale and Contribution Agreement and the other COLT 2007-SN1 Basic
     Documents. Each Series 2007-SN1 Lease Asset shall be identified as such on
     the books and records of the COLT Custodian to the extent the COLT
     Custodian reasonably determines to be necessary to comply with the terms
     and conditions of the COLT Sale and Contribution Agreement and, if
     applicable, the other COLT 2007-SN1 Basic Documents. The COLT Custodian
     shall conduct, or cause to be conducted, periodic physical inspections of
     the Series 2007-SN1 Lease Asset Files held by it under this COLT Custodian
     Agreement, and of the related accounts, records and computer systems, in
     such a manner as shall enable the Servicer and the COLT Custodian to verify
     the accuracy of the COLT Custodian's inventory and record keeping. The COLT
     Custodian shall promptly report to COLT any failure on its part to hold the
     related Series 2007-SN1 Lease Asset File as described herein and maintain
     its accounts, records and computer systems as herein provided and promptly
     take appropriate action to remedy any such failure.

               (b) Access to Records. Subject only to the COLT Custodian's
     security requirements applicable to its own employees having access to
     similar records held by the COLT Custodian, the COLT Custodian shall permit
     COLT or the COLT Indenture Trustee or any of their duly authorized
     representatives, attorneys or auditors to inspect the related Series
     2007-SN1 Lease Asset Files described herein and the related accounts,
     records and computer systems maintained by the COLT Custodian pursuant
     hereto at such times as COLT or the COLT Indenture Trustee may reasonably
     request.

               (c) Release of Documents. The COLT Custodian shall release any
     Series 2007-SN1 Lease Asset (and its related Series 2007-SN1 Lease Asset
     File) to



     COLT, the Servicer or the COLT Indenture Trustee, as appropriate, under the
     circumstances provided in the COLT Sale and Contribution Agreement, the
     COLT Servicing Agreement and the other COLT 2007-SN1 Basic Documents.

               (d) Administration; Reports. In general, the COLT Custodian shall
     attend to all non-discretionary details in connection with maintaining
     custody of the Series 2007-SN1 Lease Asset Files as described herein. In
     addition, the COLT Custodian shall assist the Servicer generally in the
     preparation of routine reports to the Holders of the COLT 2007-SN1 Secured
     Notes, if any, or to regulatory bodies, to the extent necessitated by the
     COLT Custodian's custody of the Series 2007-SN1 Lease Asset Files described
     herein.

               (e) Servicing. The COLT Custodian is familiar with the duties of
     the Servicer, the servicing procedures and the allocation and distribution
     provisions (including those related to principal collections, losses and
     recoveries on Series 2007-SN1 Lease Assets) set forth in the COLT Servicing
     Agreement and the other COLT 2007-SN1 Basic Documents and hereby agrees to
     maintain the Series 2007-SN1 Lease Asset Files in a manner consistent
     therewith. The COLT Custodian further agrees to cooperate with the Servicer
     in the Servicer's performance of its duties under the COLT Servicing
     Agreement and the other COLT 2007-SN1 Basic Documents.

          5. Instructions; Authority to Act. The COLT Custodian shall be deemed
     to have received proper instructions from COLT with respect to the Series
     2007-SN1 Lease Asset Files described herein upon its receipt of written
     instructions signed by an Authorized Officer of COLT. A certified copy of a
     by-law or of a resolution of the appropriate governing body of COLT (or, as
     appropriate, a trustee on behalf of COLT) may be received and accepted by
     the COLT Custodian as conclusive evidence of the authority of any such
     officer to act and may be considered as in full force and effect until
     receipt of written notice to the contrary. Such instructions may be general
     or specific in terms.

          6. Indemnification by the COLT Custodian. The COLT Custodian agrees to
     indemnify COLT and the Series 2007-SN1 Further Holders for any and all
     liabilities, obligations, losses, damages, payments, costs or expenses of
     any kind whatsoever that may be imposed on, incurred or asserted against
     COLT or any Series 2007-SN1 Further Holder as the result of any act or
     omission in any way relating to the maintenance and custody by the COLT
     Custodian of the Series 2007-SN1 Lease Asset Files described herein;
     provided, however, that the COLT Custodian shall not be liable to COLT or
     any Series 2007-SN1 Further Holder, respectively, for any portion of any
     such amount resulting from the willful misfeasance, bad faith or negligence
     of COLT or such Series 2007-SN1 Further Holder, respectively.

          7. Advice of Counsel. The COLT Custodian and COLT further agree that
     the COLT Custodian shall be entitled to rely and act upon advice of counsel
     with respect to its performance hereunder and shall be without liability
     for any action reasonably taken pursuant to such advice, provided that such
     action is not in violation of applicable federal or State law.



          8. Limitation on Liability of COLT Custodian and Others.

               (a) Neither the COLT Custodian nor any of the directors or
     officers or employees or agents of the COLT Custodian shall be under any
     liability to COLT, the COLT 2007-SN1 Secured Noteholders, the COLT 2007-SN1
     Certificateholders, or any successors or assigns of the foregoing, except
     as specifically provided in the COLT 2007-SN1 Basic Documents, for any
     action taken or for refraining from the taking of any action pursuant to
     the COLT 2007-SN1 Basic Documents or for reasonable errors in judgment;
     provided, however, that this provision shall not protect the COLT Custodian
     or any such Person against any liability that would otherwise be imposed by
     reason of willful misfeasance, bad faith or negligence (except errors in
     judgment) in the performance of duties or by reason of a breach of its
     obligations and duties herein.

               (b) Except as provided in the COLT 2007-SN1 Basic Documents, the
     COLT Custodian shall not be under any obligation to appear in, prosecute or
     defend any proceeding that is not incidental to its duties to act as
     custodian of the Series 2007-SN1 Lease Assets and the other Sold Assets in
     accordance with the COLT 2007-SN1 Basic Documents and that in its opinion
     may involve it in any unreimbursed expense or liability; provided, however,
     that the COLT Custodian may undertake any reasonable action that it may
     deem necessary or desirable in respect of the COLT 2007-SN1 Basic Documents
     and the rights and duties of the parties to the COLT 2007-SN1 Basic
     Documents and the interests of the COLT 2007-SN1 Noteholders and COLT
     2007-SN1 Certificateholders in the COLT 2007-SN1 Basic Documents. In such
     event, the legal expenses and costs for such action and any liability
     resulting therefrom shall be expenses, costs and liabilities of COLT and
     the COLT Custodian shall be entitled to be reimbursed therefor after the
     receipt of notice and invoice from the COLT Custodian listing any such
     expense in reasonable detail.

          9. Effective Period, Termination, and Amendment; Interpretive and
     Additional Provisions.

               (a) This COLT Custodian Agreement shall become effective as of
     the date hereof, shall continue in full force and effect until terminated
     as hereinafter provided.

               (b) This COLT Custodian Agreement may be amended by the COLT
     Custodian and COLT (i) to cure any ambiguity, (ii) to correct or supplement
     any provision in this COLT Custodian Agreement that may be defective or
     inconsistent with any other provision of this COLT Custodian Agreement, or
     (iii) to add, change or eliminate any other provision of this COLT
     Custodian Agreement in any manner that shall not adversely affect in any
     material respect the interests of the COLT 2007-SN1 Secured Noteholders or
     the COLT 2007-SN1 Certificateholder.

               (c) This Agreement may also be amended from time to time by the
     COLT Custodian and COLT with the consent of the Holders of a majority of
     the then Outstanding Amount of the COLT 2007-SN1 Secured Notes and the COLT
     2007-SN1 Certificateholder, which consent, whether given pursuant to this
     Section 9 or pursuant to



     any other provision herein, shall be conclusive and binding on such Persons
     and on all future holders of COLT 2007-SN1 Certificates and COLT 2007-SN1
     Secured Notes for the purpose of adding any provisions to this COLT
     Custodian Agreement or changing in any manner or eliminating any of the
     provisions of this COLT Custodian Agreement, or of modifying in any manner
     the rights of the COLT 2007-SN1 Certificateholder or COLT 2007-SN1 Secured
     Noteholders; provided, however, that no such amendment shall (i) increase
     or reduce in any manner the amount of, or accelerate or delay the timing
     of, collections of payments on the Series 2007-SN1 Lease Assets or
     distributions that shall be required to be made on any COLT 2007-SN1
     Secured Note, or (ii) reduce the percentage in this Section 9 required to
     consent to any action or amendment, without the consent of all of the
     holders of the COLT 2007-SN1 Secured Notes then outstanding.

               (d) Prior to the execution of any amendment or consent pursuant
     to this Section 9, the COLT Custodian shall furnish written notice of the
     substance of such amendment or consent to the Rating Agencies (if any Rated
     Notes are outstanding), each COLT 2007-SN1 Secured Noteholder and the COLT
     2007-SN1 Certificateholder.

               (e) It shall not be necessary for the consent of the COLT
     2007-SN1 Secured Noteholders or the COLT 2007-SN1 Certificateholder
     pursuant to Section 9(c) to approve the particular form of any proposed
     amendment or consent, but it shall be sufficient if such consent shall
     approve the substance thereof. The manner of obtaining such consents (and
     any other consents of the COLT 2007-SN1 Secured Noteholders or the COLT
     2007-SN1 Certificateholder provided for in this COLT Custodian Agreement)
     and of evidencing the authorization of the execution thereof by the COLT
     2007-SN1 Secured Noteholders and the COLT 2007-SN1 Certificateholder shall
     be subject to such reasonable requirements as the COLT Indenture Trustee or
     the COLT Owner Trustee may prescribe, including the establishment of record
     dates.

               (f) This COLT Custodian Agreement may be terminated by either
     party by written notice to the other party and the consent of the holders
     of a majority of the then Outstanding Amount of the COLT 2007-SN1 Secured
     Notes, which consent, whether given pursuant to this Section 9 or pursuant
     to any other provision herein shall be conclusive and binding on such
     Persons and on all future holders of COLT 2007-SN1 Secured Notes, such
     termination to take effect no sooner than 60 days after the date of such
     notice. Notwithstanding the foregoing, if GMAC resigns as the Servicer
     under the COLT 2007-SN1 Basic Documents or if all of the rights and
     obligations of the Servicer have been terminated under the COLT Servicing
     Agreement, this COLT Custodian Agreement shall immediately terminate. COLT
     is granting a security interest in its rights under this COLT Custodian
     Agreement in connection with the CARAT 2007-SN1 transaction. COLT also
     acknowledges that the CARAT Indenture Trustee will be granted a security
     interest in that grant. As soon as practicable after the termination of
     this COLT Custodian Agreement, the COLT Custodian shall deliver the Series
     2007-SN1 Lease Asset Files described herein to the CARAT Indenture Trustee
     or the agent of the CARAT Indenture Trustee at such place or places the
     CARAT Indenture Trustee may reasonably designate, if both a CARAT Event of
     Default and a COLT Event of Default have occurred and are continuing, and
     otherwise to the COLT Indenture Trustee or the agent



     of the COLT Indenture Trustee at such place or places as the COLT Indenture
     Trustee may reasonably designate.

          10. Governing Law. THIS COLT CUSTODIAN AGREEMENT SHALL BE GOVERNED BY
     AND CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF NEW
     YORK, WITHOUT REGARD TO THE PRINCIPLES OF CONFLICTS OF LAWS THEREOF OR OF
     ANY OTHER JURISDICTION (OTHER THAN SECTIONS 5-1401 AND 5-1402 OF THE NEW
     YORK GENERAL OBLIGATIONS LAW), AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF
     THE PARTIES UNDER THIS COLT CUSTODIAN AGREEMENT SHALL BE DETERMINED IN
     ACCORDANCE WITH SUCH LAWS.

          11. Notices. All demands, notices and communications upon or to COLT
     or the COLT Owner Trustee on behalf of COLT or the COLT Custodian under
     this COLT Custodian Agreement shall be delivered as specified in Part III
     of Exhibit A of the COLT Servicing Agreement.

          12. Binding Effect. This COLT Custodian Agreement shall be binding
     upon and shall inure to the benefit of the parties hereto and their
     respective successors and assigns.

          13. Severability of Provisions. If any one or more of the covenants,
     agreements, provisions or terms of this COLT Custodian Agreement shall be
     for any reason whatsoever held invalid, then such covenants, agreements,
     provisions or terms shall be deemed severable from the remaining covenants,
     agreements, provisions and terms of this COLT Custodian Agreement and shall
     in no way affect the validity or enforceability of the other provisions of
     this COLT Custodian Agreement.

          14. Assignment. Notwithstanding anything to the contrary contained in
     this COLT Custodian Agreement, this COLT Custodian Agreement may be
     assigned by the COLT Custodian without the consent of any other Person to a
     corporation, limited liability company or other entity that is a successor
     (by merger, consolidation or purchase of assets) to the COLT Custodian, or
     that more than 50% of the voting interests of which is owned, directly or
     indirectly, by GMAC or General Motors, provided that such organization
     executes an agreement of assumption as provided in Section 4.02 of the COLT
     Servicing Agreement.

          15. Headings. The headings of the various Sections herein are for
     convenience of reference only and shall not define or limit any of the
     terms or provisions hereof.

          16. Counterparts. This COLT Custodian Agreement may be executed by the
     parties in separate counterparts, each of which when so executed and
     delivered shall be an original but all such counterparts shall together
     constitute but one and the same instrument.

          17. No Third-Party Beneficiaries. This COLT Custodian Agreement shall
     inure to the benefit of and be binding upon the parties hereto and their
     respective



     successors and permitted assigns. Except as otherwise expressly provided in
     this COLT Custodian Agreement, no other Person shall have any right or
     obligation hereunder.

          18. Merger and Integration. Except as specifically stated otherwise
     herein, this COLT Custodian Agreement sets forth the entire understanding
     of the parties relating to the subject matter hereof, and all prior
     understandings, written or oral, are superseded by this COLT Custodian
     Agreement. This COLT Custodian Agreement may not be modified, amended,
     waived, or supplemented except as provided herein.

          19. Series Liabilities. It is expressly understood and agreed by the
     COLT Custodian that Series 2007-SN1 is a separate series of COLT as
     provided in Section 3806(b)(2) of the Statutory Trust Act. As such,
     separate and distinct records shall be maintained for Series 2007-SN1 Lease
     Assets and the Trust Assets associated with Series 2007-SN1 Lease Assets
     shall be held and accounted for separately from the other assets of COLT or
     any other Series. The debts, liabilities, obligations and expenses
     incurred, contracted for or otherwise existing with respect to the Series
     2007-SN1 Lease Assets, including the COLT 2007-SN1 Secured Notes and the
     obligations of COLT to the Seller and any other Interested Party under this
     Agreement, shall be enforceable against the Series 2007-SN1 Lease Assets
     only, and not against COLT generally or the assets securing any other
     Series Portfolio.

          20. No Bankruptcy Petition. The COLT Custodian hereby covenants and
     agrees that prior to the date which is one year and one day after the
     payment in full of all Secured Notes, it shall not institute against, or
     join any other Person in instituting against, COLT in any bankruptcy,
     reorganization, arrangement, insolvency or liquidation proceedings or other
     similar proceeding under the bankruptcy or similar laws of the United
     States or any State of the United States. This Section shall survive the
     termination of this COLT Custodian Agreement and the termination of the
     COLT Custodian's rights and obligations hereunder.

          21. Limitation of Liability. It is expressly understood and agreed by
     the parties hereto that (a) this COLT Custodian Agreement is executed and
     delivered by Deutsche Bank Trust Company Delaware, not individually or
     personally but solely as owner trustee of COLT, (b) each of the
     representations, undertakings and agreements herein made on the part of
     COLT is made and intended not as personal representations, undertakings and
     agreements by Deutsche Bank Trust Company Delaware but is made and intended
     for the purpose of binding only COLT, and (c) under no circumstances shall
     Deutsche Bank Trust Company Delaware be personally liable for the payment
     of any indebtedness or expenses of COLT or be liable for the breach or
     failure of any obligation, representation, warranty or covenant made or
     undertaken by COLT under this COLT Custodian Agreement or the other COLT
     2007-SN1 Basic Documents.

          22. Merger and Consolidation of the COLT Custodian. Any corporation,
     limited liability company or other entity (i) into which the COLT Custodian
     may be merged or consolidated, (ii) resulting from any merger, conversion
     or consolidation to which the COLT Custodian shall be a party, or (iii)
     succeeding to business of the COLT Custodian, or (iv) more than 50% of the
     voting stock (or, if not a corporation, other



     voting interests) of which is owned, directly or indirectly, by GMAC or
     General Motors, which corporation or entity in any of the foregoing cases
     executes an agreement of assumption to perform every obligation of the COLT
     Custodian under this Agreement and the other COLT 2007-SN1 Basic Documents,
     shall be the successor to the COLT Custodian under this Agreement without
     the execution or filing of any document or any further act on the part of
     any of the parties to this Agreement. The COLT Custodian shall provide 10
     days prior notice of any merger, consolidation or succession pursuant to
     this Section 22 to the Rating Agencies (if any Rated Notes are
     outstanding), the Servicer, the COLT Indenture Trustee and the COLT Owner
     Trustee.



     IN WITNESS WHEREOF, each of the parties hereto has caused this COLT
Custodian Agreement to be in its name and on its behalf by a duly authorized
officer as of the day and year first above written.

                                        CENTRAL ORIGINATING LEASE TRUST

                                        By: DEUTSCHE BANK TRUST COMPANY
                                            DELAWARE, not in its individual
                                            capacity but solely as COLT Owner
                                            Trustee


                                        By: /s/ Jenna Kaufman
                                            ------------------------------------
                                        Name: Jenna Kaufman
                                        Title: Attorney-in-Fact


                                        By: /s/ Aranka R. Paul
                                            ------------------------------------
                                        Name: Aranka R. Paul
                                        Title: Attorney-in-Fact


                                        GMAC LLC,
                                        as COLT Custodian


                                        By: /s/ C.J. Vannatter
                                            ------------------------------------
                                        Name: C.J. Vannatter
                                        Title: Director - Global Securitization