Document:

<PAGE>
                                                                 EXHIBIT 10.26

                             SIXTEENTH AMENDMENT TO
                       AMENDED AND RESTATED LOAN AGREEMENT

      This Sixteenth Amendment to Amended and Restated Loan Agreement (this
"Amendment") is executed as of April 21, 2006 but effective as of January 1,
2006, by and between SAI HOLDINGS, INC., a Texas corporation ("Borrower"), and
GUARANTY BANK, a federal savings bank ("Bank").

                                R E C I T A L S:

      A. Borrower and Bank have entered into that certain Amended and Restated
Loan Agreement dated as of April 30, 2001 (as the same has been or may be
amended, restated, modified or supplemented from time to time, the "Agreement").

      B. Borrower has requested Bank to amend Section 11.7 of the Agreement,
which Bank is willing to do pursuant to the terms and conditions hereinafter
provided.

      C. Borrower and Bank now desire to amend the Agreement as herein set
forth.

      NOW, THEREFORE, in consideration of the premises herein contained and
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto agree as follows:

                                    ARTICLE I

                                   DEFINITIONS

      Section 1.1 Definitions. Capitalized terms used in this Amendment, to the
extent not otherwise defined herein, shall have the same meaning as in the
Agreement, as amended hereby.

                                   ARTICLE II

                             AMENDMENTS TO AGREEMENT

      Section 2.1 Amendment to Section 11.7. Effective as of January 1, 2006,
Section 11.7 of the Agreement is amended and restated in its entirety to read as
follows:

            Section 11.7 Penson Worldwide EBITDA. Borrower shall not permit
      Penson Worldwide to permit more than 50% of its EBITDA to be based upon
      income of any direct or indirect foreign Subsidiaries.

<PAGE>

                                   ARTICLE III

                              CONDITIONS PRECEDENT

      Section 3.1 Conditions. The effectiveness of this Amendment is subject to
the satisfaction of the following conditions precedent:

            (a) Bank shall have received all of the following, each dated
      (unless otherwise indicated) the date of this Amendment, in form and
      substance satisfactory to Bank:

                  (1) Amendment. This Amendment, duly executed by Borrower and
            ratified by each guarantor listed herein;

                  (2) Attorneys' Fees and Expenses. Payment of all outstanding
            attorneys' fees and expenses incurred by Bank in connection with the
            Agreement, as amended; and

                  (3) Additional Information. Such additional documents,
            instruments and information as Bank or its legal counsel, Winstead
            Sechrest & Minick P.C., may reasonably request.

            (b) The representations and warranties contained herein and in all
      other Loan Documents, as amended hereby, shall be true and correct as of
      the date hereof as if made on the date hereof, except to the extent
      disclosed on Schedules delivered as of the date of this Amendment.

            (c) No Event of Default shall have occurred and be continuing and no
      event or condition shall have occurred that with the giving of notice or
      lapse of time or both would be an Event of Default.

            (d) All corporate proceedings taken in connection with the
      transactions contemplated by this Amendment and all documents,
      instruments, and other legal matters incident thereto shall be
      satisfactory to Bank and its legal counsel, Winstead Sechrest & Minick
      P.C.

                                   ARTICLE IV

                                    NO WAIVER

      Section 4.1 No Waiver. Nothing contained herein shall be construed as a
waiver by Bank of any covenant or provision of the Agreement, this Amendment, or
the other Loan Documents, or of any other contract or instrument between
Borrower and Bank, and the failure of Bank at any time or times hereafter to
require strict compliance by Borrower of any provision thereof shall not waive,
affect or diminish any right of Bank to thereafter demand strict compliance
therewith. Bank hereby reserves all rights granted under the Agreement, this
Amendment, the other Loan Documents and any other contract or instrument between
Borrower and Bank.

                                       2
<PAGE>

                                    ARTICLE V

                                  MISCELLANEOUS

      Section 5.1 Representations and Warranties. Borrower hereby represents and
warrants to Bank that (a) the execution, delivery and performance of this
Amendment and any and all other Loan Documents executed and/or delivered in
connection herewith have been authorized by all requisite corporate action on
the part of Borrower and will not violate the articles of incorporation or
bylaws of Borrower, (b) the representations and warranties contained in the
Agreement, as amended hereby, and any other Loan Document are true and correct
on and as of the date hereof as though made on and as of the date hereof, (c) no
Event of Default has occurred and is continuing and no event or condition has
occurred that with the giving of notice or lapse of time or both would be an
Event of Default, and (d) Borrower is in full compliance with all covenants and
agreements contained in the Agreement as amended hereby.

      Section 5.2 Ratifications. Except as expressly modified and superseded by
this Amendment, the terms and provisions of the Agreement and the other Loan
Documents are ratified and confirmed and shall continue in full force and
effect. The representations and warranties contained herein and in all other
Loan Documents, as amended hereby, shall be true and correct as of, and as if
made on, the date hereof. Borrower and Bank agree that the Agreement as amended
hereby shall continue to be legal, valid, binding and enforceable in accordance
with its respective terms.

      Section 5.3 Reference to the Agreement. Each of the Loan Documents,
including the Agreement and any and all other agreements, documents or
instruments now or hereafter executed and delivered pursuant to the terms hereof
or pursuant to the terms of the Agreement as amended hereby, are hereby amended
so that any reference in such Loan Documents to the Agreement shall mean a
reference to the Agreement as amended hereby.

      Section 5.4 Expenses of Bank. As provided for in the Agreement, Borrower
agrees to pay on demand all reasonable costs and expenses incurred by Bank in
connection with the preparation, negotiation, execution of this Amendment, and
the other Loan Documents executed pursuant hereto and any and all amendments,
modifications and supplements thereto including, without limitation, the
reasonable costs and fees of Bank's legal counsel, and all reasonable costs and
expenses incurred by Bank in connection with the enforcement or preservation of
any rights under the Agreement, as amended hereby, or any other Loan Documents.

      Section 5.5 Severability. Any provisions of this Amendment held by court
of competent jurisdiction to be invalid or unenforceable shall not impair or
invalidate the remainder of this Amendment and the effect thereof shall be
confined to the provisions so held to be invalid or unenforceable.

      Section 5.6 Applicable Law. This Amendment and all other Loan Documents
executed pursuant hereto shall be governed by and construed in accordance with
the laws of the State of Texas.

                                       3
<PAGE>

      Section 5.7 Successors and Assigns. This Amendment is binding upon and
shall inure to the benefit of Bank and Borrower and their respective successors
and assigns.

      Section 5.8 Counterparts. This Amendment may be executed in one or more
counterparts, each of which when so executed shall be deemed to be an original
but all of which when taken together shall constitute one and the same
instrument.

      Section 5.9 Headings. The headings, captions, and arrangements used in
this Amendment are for convenience only and shall not affect the interpretation
of this Amendment.

      Section 5.10 NO ORAL AGREEMENTS. THIS AMENDMENT AND ALL OTHER INSTRUMENTS,
DOCUMENTS AND AGREEMENTS EXECUTED AND DELIVERED IN CONNECTION HEREWITH REPRESENT
THE FINAL AGREEMENT BETWEEN THE PARTIES, AND MAY NOT BE CONTRADICTED BY EVIDENCE
OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT ORAL AGREEMENTS BETWEEN THE PARTIES.
THERE ARE NO UNWRITTEN ORAL AGREEMENTS BETWEEN THE PARTIES.

      [Remainder of Page Intentionally Left Blank; Signature Page Follows]

                                       4
<PAGE>
      EXECUTED as of April 21, 2006.

                                    BORROWER:

                                    SAI HOLDINGS, INC.

                                    By: /s/ Caswell O. Robinson, Jr.
                                        ----------------------------------------
                                    Name: Caswell O. Robinson, Jr.
                                          --------------------------------------
                                    Title:
                                           -------------------------------------

                                    BANK:

                                    GUARANTY BANK

                                    By: /s/ Roger J. Engemoen, Jr.
                                        ----------------------------------------
                                    Name: Roger J. Engemoen, Jr.
                                          --------------------------------------
                                    Title: Chairman
                                           -------------------------------------

                                 Signature Page
                   Sixteenth Amendment to Amended and Restated
                                 Loan Agreement
<PAGE>

                REAFFIRMATION OF AMENDED AND RESTATED GUARANTIES

      Each of the undersigned hereby (i) consents to the execution and delivery
of the Amendment to which this Reaffirmation of Amended and Restated Guaranties
is attached (the "Amendment") by the parties thereto, (ii) agrees that the
Amendment shall not limit or diminish the obligations of each of the undersigned
under certain Fifth Amended and Restated Guaranties (Limited) dated as of
December 31, 2002 (each, a "Guaranty"), executed or joined in by each of the
undersigned and delivered to the Bank, (iii) reaffirms his obligations under his
respective Guaranty, and (iv) agrees that his Guaranty remains in full force and
effect, as limited by the terms of such Guaranty, and is hereby ratified and
confirmed.

Dated as of April 21, 2006.

                                          GUARANTORS:

                                          /s/ William D. Gross
                                          --------------------------------------
                                          William D. Gross

                                          /s/ Daniel P. Son
                                          --------------------------------------
                                          Daniel P. Son

                                          /s/ Philip W. Pendergraft
                                          --------------------------------------
                                          Philip A. Pendergraft

                                          /s/ Roger J. Engemoen, Jr.
                                          --------------------------------------
                                          Roger J. Engemoen, Jr.<PAGE>

                                                                    EXHIBIT 10.1

                              MANAGEMENT AGREEMENT

     THIS HOTEL MANAGEMENT AGREEMENT (the "Agreement" or "Hotel Management
Agreement") made and entered into as of this 11th day of February, 2004 by and
between Summit Hotel Properties, LLC, a South Dakota limited liability company
(hereinafter referred to as "Owner"), and The Summit Group, Inc., a South Dakota
corporation, acting on its own behalf, (hereinafter referred to as "Manager").

     WHEREAS, it is the desire of the Owner that all hotels currently owned or
hereinafter owned by Owner ("Hotels") be managed and operated efficiently and
effectively; and

     WHEREAS, Manager is a corporation engaging in hotel management;

     WHEREAS, the Owner desires to engage the Manager to manage the Hotels and
the Manager desires to accept said engagement, all in accordance with the terms
and conditions of this agreement as hereinafter set forth.

     NOW, THEREFORE, in consideration of the mutual covenants herein contained,
the parties hereto agree as follows:

1.   ENGAGEMENT

     The Owner hereby engages the Manager, and the Manager hereby accepts such
     engagement, as the manager for the Hotels upon the terms and conditions
     hereinafter set forth, for a period ending on the first to occur of: (1)
     the dissolution of the Owner, or (2) termination of this Agreement. The
     Manager shall manage the Hotels, devoting such time thereto as in its sole
     discretion, it shall determine to be necessary to manage the Hotels in an
     efficient and effective manner.

2.   INDEPENDENT CONTRACTOR

     In the performance of its duties under this Agreement, the Manager shall
     occupy the position of an independent contractor with respect to the Owner.
     Except as expressly otherwise provided for herein, nothing contained herein
     shall be construed as making the Manager an employee of the Owner.

3.   DUTIES AND AUTHORITY OF THE MANAGER

     (A)  GENERAL DUTIES AND AUTHORITY

          Subject only to the restrictions and limitations provided for herein
          and the right of the Owner to terminate this Agreement as provided
          herein, the Manager shall have the sole and exclusive authority to
          fully and completely supervise the Hotels and supervise and direct the
          business and affairs associated or related to the operation thereof,
          and to that end to cause or direct the Owner to execute such documents
          or instruments and hire or discharge such employees as, in the sole
          judgment of the Manager, may deem necessary or advisable.

<PAGE>

     (B)  OPERATION OF THE HOTELS

          The Manager shall direct and establish policies and procedures for the
          Owner's employees who will have direct responsibility for the Hotel's
          operations. The Manager shall have the sole discretion, which
          discretion shall be exercised in good faith, to establish the terms
          and conditions of patron occupancy, including, although not
          necessarily limited to, room rental schedules, occupancy policies, and
          departure times. The Manager is hereby authorized to direct and
          control the promotional activity of the Owner's employees and cause
          the Owner to advertise in such media and to the extent that it deems
          necessary and appropriate.

     (C)  ACCOUNTING

          The Manager shall devise, establish and supervise the operation of an
          accounting system for the Hotel staff who will be primarily
          responsible for, among other things, performing all bookkeeping and
          administrative duties in connection with the Hotels, including all
          collections and all disbursements to be paid out of funds generated by
          such operations or otherwise supplied by the Owner. At Manager's sole
          discretion any or all accounting, bookkeeping and administrative
          duties may be performed by employees of Manager. Expenses of Manager's
          bookkeeping department shall be paid by all hotels and businesses,
          including Hotels, for which Manager performs bookkeeping services, on
          a pro rata per number of rooms per hotel managed basis.

     (D)  DEPOSITS AND DISBURSEMENTS

          The Manager shall cause the establishment of bank accounts in the name
          of the Owner and shall establish and be responsible for administrating
          a policy for specifying the identity of signatories to such bank
          accounts. The Manager shall deposit or cause to be deposited in the
          Owner's bank accounts all receipts and monies arising from the
          operations of the Hotels or otherwise received for and on behalf of
          the Owner. The Manager shall be responsible for the disbursement of
          the Owner's funds in payment of all expenses incurred in connection
          with the operations of the Hotels.

     (E)  AGREEMENTS

          Manager shall negotiate and enter into leases, licenses, permits,
          service contracts, employee agreements, and agreements for guest room
          rental on behalf of Owner, in Owner's name.

     (F)  RESTRICTIONS

          Notwithstanding anything to the contrary set forth in this section,
          the Manager shall not be required to do, or cause to be done, anything
          for the account of the Owner (1) which would make the Manager liable
          to third parties except in the course of managing and operating the
          Hotels; (2) which may not be commenced, undertaken, or completed
          because of insufficient funds available in the accounts established
          pursuant to this section; (3) which may, under applicable law,
          constitute an impermissible delegation of the duties and
          responsibilities of the Owner, including but not limited to, the
          purchase or construction of capital

                                        2
<PAGE>

          improvements, the sale or disposition of all or substantially all of
          the Owner's assets, and any action which may result in a change in the
          Owner's primary business; or (4) which may not be commenced,
          undertaken, or completed because of acts of God, strikes, governmental
          regulations or laws, acts of war, or other types of events beyond the
          Manager's control whether similar or dissimilar to the foregoing.

4.   DUTIES OF THE OWNER

     (A)  COOPERATION

          The Owner hereby agrees to cooperate with the Manager in the
          performance of its duties under this Agreement and to execute all
          documents or instruments necessary or advisable to enable the Manager
          to fulfill its duties under this Agreement.

     (B)  EXPENSES BORNE BY OWNER

          All operating expenses, ownership costs, and expenses incurred by
          Manager on behalf of Owner or Hotels shall be the responsibility of
          Owner. Operating expenses include but are not limited to: salaries,
          wages and benefits for all Hotel employees; repairs and maintenance to
          the Hotels, including capital expenditures; marketing and advertising
          expenses; debt service on any mortgage or other loans to the Hotels;
          property taxes; all administrative and general expenses; all legal,
          accounting and bookkeeping expenses; and franchise fees.

     (C)  ADVANCE FUNDS

          Manager shall not be obligated to advance any of its own funds for the
          maintenance and operation of the Hotels or for the account of Owner,
          nor to incur any liability with respect to the Hotels. However, if
          Manager shall have advanced funds for any necessary and appropriate
          expenses, Owner shall reimburse Manager therefor on demand. In the
          event Manager advances funds for the maintenance and operation of the
          Hotels or for the account of Owner, Owner shall pay Manager interest
          on the advanced funds at a rate to be determined by the parties.

5.   COMPENSATION TO THE MANAGER

     The Manager, as a Management Fee, shall be reimbursed for its overhead
     costs and expenses related to managing the Hotels. If Manager manages more
     hotels than the Hotels contemplated by this Agreement, then Manager shall
     charge each hotel managed, including Hotels, its pro rata share of all
     overhead expenses, which include but are not limited to: wages of employees
     and officers, including the salary of Kerry W. Boekelheide; rent; legal;
     accounting; insurance; and travel expenses. In no event will the annualized
     Management Fee exceed five percent (5%) of annual gross revenues. Such
     Management Fee shall be paid to Manager on a monthly basis. Any expenses
     for services that would customarily be handled by a hotel property, such as
     bookkeeping, and expenses that are paid for third party services, such as
     accounting and legal services, shall be paid directly by the Hotels or
     Owner or shall be reimbursed to the Manager and shall not be included in
     the five percent of gross revenue cap.

                                        3

<PAGE>

6.   TERMINATION

     (A)  FOR CAUSE.

          This Agreement may be terminated by the Owner and the Manager may be
          removed, in part or in whole, as further described in Section 6b
          below, only for "cause". "Cause" shall mean a material violation or
          breach of the authority, duty or obligations given to the Manager
          under this Agreement, or knowingly and intentionally failing to
          discharge such duties, willfully and wantonly disregarding the
          interest of the Owner or the Hotels, intentionally and deliberately
          disregarding standards of behavior or conduct for a hotel management
          position which the Owner and others have a right to expect of Manager,
          or any other acts or omissions of carelessness or negligence of such
          degree or recurrence as to manifest equal culpability or wrongful
          intent. Mere failure to perform as the result of a good faith error in
          judgment or discretion shall not constitute "cause."

     (B)  PARTIAL TERMINATION.

          In the event that the grounds for removal of Manager are deemed
          specific to one or more individual Hotels, either under a respective
          franchise agreement or otherwise, this Agreement shall only be
          terminated with respect to such Hotel or Hotels. The remaining rights,
          authority and obligations of Manager with respect to the remaining
          Hotels shall remain.

     (C)  NOTICE TO FRANCHISOR

          Except as otherwise provided herein, Owner shall provide no less than
          thirty (30) days prior written notice of removal of Manager from
          management of a Hotel or Hotels to the Franchisor or Franchisors of
          such Hotels. In the event the breach warrants immediate removal of the
          Manager, such as theft, fraud, or actions or omissions that cause
          default under a franchise agreement, notice shall be promptly provided
          to the respective Franchisors, but the Manager may be removed
          immediately. .

7.   ASSIGNMENT

     This Agreement and any rights hereunder may be assignable by the Manager,
     provided, however, any such assignee must assume all obligations of the
     Manager hereunder.

8.   INDEMNIFICATION

     The Owner hereby agrees to indemnify and hold harmless the Manager, all
     companies affiliated with the Manager, all officers, directors, and
     employees of the Manager, and any affiliated companies harmless from any
     and all costs, expenses, attorney fees, suits, liabilities, judgments,
     damages, and claims in connection with the management of the Hotels
     (including the loss of use thereof following any damage, injury, or
     destruction) arising from any cause except for fraud or misconduct on the
     part of the Manager or

                                        4
<PAGE>

     such other persons and entities. The Manager, all persons affiliated with
     the Manager, all officers, directors, and employees of the Manager, and any
     affiliated persons also shall not be liable for any error of judgment or
     for any mistake of fact or law, or for anything which it or they may do or
     refrain from doing hereinafter, except in cases of fraud or misconduct. The
     Manager hereby agrees to indemnify and hold the Owner harmless from any and
     all costs, expenses, attorney fees, suits, liabilities, judgments, damages
     and claims in connection with the management of the Hotels arising from the
     fraud or misconduct of the Manager or any of its affiliates. The Owner
     shall have one year from the action or inaction giving rise to such claim
     to bring suit against the Manager.

9.   FRANCHISE COMPLIANCE

     Manager understands that several of the Hotels are franchised by various
     national hotel franchise companies ("Franchisors"). Each of the Franchisors
     sets forth rules, standards and procedures that must be followed by the
     Hotels that are bound by the respective franchises.

     Management of any Hotels pursuant to any Marriott International franchises
     is subject to the additional provisions below:

          (A)  DAILY MANAGEMENT

               The Manager shall have the authority and responsibility for the
               day-to-day management of the Hotels.

          (B)  COMPLIANCE WITH FRANCHISE AGREEMENT

               The Hotels will be operated during the term of this Hotel
               Management Agreement in strict compliance with the requirements
               of the franchise agreements with the Marriott International.
               Specifically, the Manager will be bound by and shall adhere
               strictly to all terms and conditions in the franchise agreements
               regarding confidentiality and operation of the Hotels, which
               terms and conditions may be enforced by Marriott International
               directly with the Manager.

          (C)  CONTROLLING AGREEMENT

               If there are conflicts between any provision(s) of this Hotel
               Management Agreement and the Marriott International franchise
               agreements, the provisions(s) of the franchise agreements shall
               control.

          (D)  DEFAULT

               Any default under the terms and conditions of the respective
               Marriott International franchise agreements caused wholly or
               partially by the Manager shall constitute a default under the
               terms and conditions of this Hotel Management Agreement, for
               which Franchisee shall have the right to terminate the Hotel
               Management Agreement with respect to the Hotel that is in
               violation of its franchise agreement.

                                       5

<PAGE>

          (E)  COMMUNICATION WITH MANAGEMENT

               Marriott International shall have the right to communicate
               directly with the Manager regarding day-to-day operation of the
               Hotels.

10.  CAPTIONS

     The captions contained herein are for convenience of reference only and are
     not intended to define, limit, or describe the scope or intent of any
     provisions of this Agreement.

11.  GOVERNING LAW

     The validity of this Agreement, the construction of its terms, and the
     interpretation of the rights and duties of the parties shall be governed by
     the laws of the State of South Dakota.

12.  NOTICES

     Any notice required or permitted herein to be given shall be in writing and
     shall be personally delivered or mailed, first-class mail, postage prepaid,
     to the respective addresses of the parties set forth below their signatures
     on the signature page hereof, or to such address as any party may give to
     the other in writing.

13.  SEVERABILITY

     Should any term or provision hereof be deemed invalid, void, or
     unenforceable either in its entirety or in a particular application, the
     remainder of this Agreement shall nonetheless remain in full force and
     effect, and if the subsequent term or provision is deemed to be invalid,
     void, or unenforceable only with respect to a particular application, such
     term or provision shall remain in full force and effect with respect to all
     other applications. The parties recognize that broad discretionary
     authority has been granted by Owner to the Manager in the supervision and
     direction of the Owner's business and financial affairs, and it is their
     intent that such authority be fully exercisable by the Manager within the
     limitations imposed by applicable law.

14.  SUCCESSORS

     This Agreement shall be binding upon and inure to the benefit of the
     respective parties hereto and their permitted assigns and successors in
     interest.

15.  ATTORNEY FEES

     If it shall become necessary for either party hereto to engage attorneys to
     institute legal action for the purpose of enforcing its rights hereunder or
     for the purpose of defending legal action brought by the other party
     hereto, the party or parties prevailing in such litigation shall be
     entitled to receive all costs, expenses, and fees (including reasonable
     attorney's fees) incurred by it in such litigation (including appeals).

16.  OTHER DOCUMENTS

     The parties shall and do hereby agree to execute any other and further
     documents which may be necessary to effectuate this Agreement.

                                        6

<PAGE>

17.  MODIFICATION

     This Agreement may be amended or modified at any time by the parties hereto
     provided that the same is reduced to writing and signed by each party
     hereto. This Agreement may not be modified by oral agreement.

18.  COMPLETE AGREEMENT

     This Agreement constitutes the complete agreement by and between the
     parties hereto and supplants and supersedes all prior or contemporaneous
     oral or written discussions, agreements or effects.

IN WITNESS WHEREOF, the parties hereto have executed this Agreement in duplicate
on the date first above written.

OWNER:                                  MANAGER:
SUMMIT HOTEL PROPERTIES, LLC            THE SUMMIT GROUP, INC.

By: /s/ Kerry W. Boekelheide            By: /s/ Kerry W. Boekelheide
    ---------------------------------       ------------------------------------
Name: Kerry W. Boekelheide              Name: Kerry W. Boekelheide
Its: President of the Company Manager   Its: President

2701 S. Minnesota Avenue, Suite 6       2701 S. Minnesota Avenue, Suite 6
Sioux Falls, SD 57105                   Sioux Falls, SD 57105

                                       7

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