Exhibit 10.128

GUARANTY AGREEMENT

(Lender Guaranty)

THISGUARANTY AGREEMENT (this "Agreement") is made and given as of February 28, 2003 by ALTERRA HEALTHCARE CORPORATION, a Delaware corporation (the "Guarantor"), for the benefit of SNH ALT MORTGAGED PROPERTIES TRUST, a Maryland real estate investment trust (together with its successors and assigns, the "Lender").

W I T N E S S E T H :

WHEREAS, pursuant to a Loan Agreement, dated as of the date hereof (as amended from time to time, the "Loan Agreement"), between the Lender and Pomacy Corporation (the "Borrower"), the Borrower has agreed to borrow from the Lender and the Lender has agreed to loan to the Borrower, the principal amount of SIX MILLION NINE HUNDRED THOUSAND DOLLARS ($6,900,000), as more particularly described in the Loan Agreement; and

1.     Certain Terms.  Capitalized terms used and not otherwise defined in this Agreement shall have the meanings ascribed to such terms in the Loan Agreement.

2.     Guaranteed Obligations.  For purposes of this Agreement, the term "Guaranteed Obligations" shall mean the payment and performance of each and every obligation of the Borrower to the Lender under the Loan Documents or relating thereto, whether now existing or hereafter arising, and including, without limitation, the payment of principal and interest under the Note.

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3.     Representations and Covenants.  The Guarantor represents, warrants, covenants, and agrees that:

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4.     Guarantee.  The Guarantor hereby unconditionally and irrevocably guarantees that the Guaranteed Obligations which are monetary obligations shall be paid in full when due and payable, whether upon demand, at the stated or accelerated maturity thereof pursuant to any Loan Document, or otherwise, and that the Guaranteed Obligations which are performance obligations shall be fully performed at the times and in the manner such performance is required by the Loan Documents.  With respect to the Guaranteed Obligations which are monetary obligations, this guarantee is a guarantee of payment and not of collectibility and is absolute and in no way conditional or contingent.  In case any part of the Guaranteed Obligations shall not have been paid when due and payable or performed at the time performance is required, the Guarantor shall, in the case of monetary obligations, within five (5) days after receipt of notice from the Lender, pay or cause to be paid to the Lender the amount thereof as is then due and payable and unpaid (including interest and other charges, if any, due thereon through the date of payment in accordance with the applicable provisions of the Loan Documents) or, in the case of nonmonetary obligations, perform or cause to be performed such obligations in accordance with the Loan Documents.

5.     Set-Off.  The Guarantor hereby authorizes the Lender, at any time and without notice to set off the whole or any portion or portions of any or all sums credited by or due from the Lender to it against amounts payable under this Agreement.  The Lender shall promptly notify the Guarantor of any such set-off made by the Lender and the application made by the Lender of the proceeds thereof.

6.     Unenforceability of Guaranteed Obligations, Etc.  If the Borrower is for any reason under no legal obligation to discharge any of the Guaranteed Obligations (other than because the same have been previously discharged in accordance with the terms of the Loan Documents), or if any other moneys included in the Guaranteed Obligations have become unrecoverable from the Borrower by operation of law or for any other reason, including, without limitation, the invalidity or irregularity in whole or in part of any Guaranteed Obligation or of any Loan Document or any limitation on the liability of the Borrower thereunder not contemplated by the Loan Documents or any limitation on the method or terms of payment thereunder which may now or hereafter be caused or imposed in any manner whatsoever, the guarantees contained in this Agreement shall nevertheless remain in full force and effect and shall be binding upon the Guarantor to the same extent as if the Guarantor at all times had been the principal debtor on all such Guaranteed Obligations.

7.     Additional Guarantees.  This Agreement shall be in addition to any other guarantee or other security for the Guaranteed Obligations and it shall not be prejudiced or rendered unenforceable by the invalidity of any such other guarantee or security or by any waiver, amendment, release or modification thereof.

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8.     Consents and Waivers, Etc.  The Guarantor hereby acknowledges receipt of correct and complete copies of each of the Loan Documents, and consents to all of the terms and provisions thereof, as the same may be from time to time hereafter amended or changed in accordance with the terms and conditions thereof, and, except as otherwise provided herein, to the maximum extent permitted by applicable law, waives (a) presentment, demand for payment, and protest of nonpayment, of any principal of or interest on any of the Guaranteed Obligations, (b) notice of acceptance of this Agreement and of diligence, presentment, demand and protest, (c) notice of any default hereunder and any default, breach or nonperformance or Event of Default under any of the Guaranteed Obligations or the Loan Documents, (d) notice of the terms, time and place of any private or public sale of any collateral held as security for the Guaranteed Obligations, (e) demand for performance or observance of, and any enforcement of any provision of, or any pursuit or exhaustion of rights or remedies against the Borrower or any other guarantor of the Guaranteed Obligations, under or pursuant to the Loan Documents, or any agreement directly or indirectly relating thereto and any requirements of diligence or promptness on the part of the holders of the Guaranteed Obligations in connection therewith, and (f) to the extent it lawfully may do so, any and all demands and notices of every kind and description with respect to the foregoing or which may be required to be given by any statute or rule of law and any defense of any kind which it may now or hereafter have with respect to this Agreement, or any of the Loan Documents or the Guaranteed Obligations (other than that the same have been discharged in accordance with the Loan Documents).

9.     No Impairment, Etc.  The obligations, covenants, agreements and duties of the Guarantor under this Agreement shall not be affected or impaired by any assignment or transfer in whole or in part of any of the Guaranteed Obligations without notice to the Guarantor, or any waiver by the Lender or any holder of any of the Guaranteed Obligations or by the holders of all of the Guaranteed Obligations of the performance or observance by the Borrower or any other guarantor of any of the agreements, covenants, terms or conditions contained in the Guaranteed Obligations or the Loan Documents or any indulgence in or the extension of the time for payment by the Borrower or any other guarantor of any amounts payable under or in connection with the Guaranteed Obligations or the Loan Documents or any other instrument or agreement relating to the Guaranteed Obligations or of the time for performance by the Borrower or any other guarantor of any other obligations under or arising out of any of the foregoing or the extension or renewal thereof (except that with respect to any extension of time for payment or performance of any of the Guaranteed Obligations granted by the Lender or any other holder of such Guaranteed Obligations to the Borrower, the Guarantor's obligations to pay or perform such Guaranteed Obligation shall be subject to the same extension of time for performance), or the modification or amendment (whether material or otherwise) of any duty, agreement or obligation of the Borrower or any other guarantor set forth in any of the foregoing, or the voluntary or involuntary sale or other disposition of all or substantially all the assets of the Borrower or any other guarantor or insolvency, bankruptcy, or other similar proceedings affecting the Borrower or any other guarantor or any assets of the Borrower or any such other guarantor, or the release or discharge of the Borrower or any such other guarantor from the performance or observance of any agreement, covenant, term or condition contained in any of the foregoing without the consent of the holders of the Guaranteed Obligations by operation of law, or any other cause, whether similar or dissimilar to the foregoing.

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10.     Bankruptcy Considerations.The provisions of this Agreement have been approved by the Bankruptcy Court overseeing the Chapter 11 case of the Guarantor.  The obligations of the Guarantor and the Lender shall not be limited, modified or otherwise relieved by any proceedings or orders entered in the Guarantor's bankruptcy case.  The Lender shall be entitled to take all actions it deems appropriate in order that it may exercise its rights and remedies as provided herein without further relief from the Bankruptcy Court so long as the Lender shall provide the Guarantor with at least five (5) Business Days' written notice of its intention to take any such action, unless the Bankruptcy Court enters an order restricting such action.  Except as limited by the foregoing, the Guarantor and the Lender shall retain their respective rights and remedies as provided in this Agreement.

11.     Reimbursement, Subrogation, Etc.  The Guarantor hereby covenants and agrees that it will not enforce or otherwise exercise any rights of reimbursement, subrogation, contribution or other similar rights against the Borrower (or any other person against whom the Lender may proceed) with respect to the Guaranteed Obligations prior to the payment in full of all amounts owing with respect to the Loan Documents, and until all indebtedness of the Borrower to the Lender shall have been paid in full, the Guarantor shall not have any right of subrogation, and the Guarantor waives any defense it may have based upon any election of remedies by the Lender which destroys its subrogation rights or its rights to proceed against the Borrower for reimbursement, including, without limitation, any loss of rights the Guarantor may suffer by reason of any rights, powers or remedies of the Borrower in connection with any anti-deficiency laws or any other laws limiting, qualifying or discharging the indebtedness to the Lender.  Until all obligations of the Borrower pursuant to the Loan Documents shall have been paid and satisfied in full, the Guarantor further waives any right to enforce any remedy which the Lender now has or may in the future have against the Borrower, any other guarantor or any other person and any benefit of, or any right to participate in, any security whatsoever now or in the future held by the Lender.

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12.     Defeasance.  This Agreement shall terminate at such time as the Guaranteed Obligations have been paid and performed in full and all other obligations of the Guarantor to the Lender under this Agreement have been satisfied in full; provided, however, if at any time, all or any part of any payment applied on account of the Guaranteed Obligations is or must be rescinded or returned for any reason whatsoever (including, without limitation, the insolvency, bankruptcy or reorganization of the Borrower), this Agreement, to the extent such payment is or must be rescinded or returned, shall be deemed to have continued in existence notwithstanding any such termination.

13.     Notices.  (a)  Any and all notices, demands, consents, approvals, offers, elections and other communications required or permitted under this Agreement shall be deemed adequately given if in writing and the same shall be delivered either (i) in hand, (ii) by telecopier with electronic confirmation of receipt (provided a conforming copy is immediately delivered by hand or by Federal Express or a similar expedited commercial carrier), or (iii) by mail or Federal Express or similar expedited commercial carrier, addressed to the recipient of the notice, postpaid and registered or certified with return receipt requested (if by mail), or with all freight charges prepaid (if by Federal Express or similar carrier).

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(c)  All such notices shall be addressed,

if to the Lender to:

c/o Senior Housing Properties Trust
400 Centre Street
Newton, Massachusetts  02458
Attn:  Mr. David J. Hegarty

with a copy to:

Sullivan & Worcester LLP
One Post Office Square
Boston, Massachusetts  02109
Attn:  Nancy S. Grodberg, Esq.
[Telecopier No. (617) 338-2880]

if to the Guarantor to:

Alterra Healthcare Corporation
10000 Innovation Drive
Milwaukee, WI  53226
Attn:  Mr. Mark W. Ohlendorf
[Telecopier No. (414) 918-5050]

with a copy to:

(d)  By notice given as herein provided, the parties hereto and their respective successors and assigns shall have the right from time to time and at any time during the term of this Agreement to change their respective addresses effective upon receipt by the other parties of such notice and each shall have the right to specify as its address any other address within the United States of America.

14.     Successors and Assigns.  Whenever in this Agreement any of the parties hereto is referred to, such reference shall be deemed to include the successors and assigns of such party, including without limitation the holders, from time to time, of the Guaranteed Obligations; and all representations, warranties, covenants and agreements by or on behalf of the Guarantor which are contained in this Agreement shall inure to the benefit of the Lender's successors and assigns, including without limitation said holders, whether so expressed or not.

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15.     Applicable Law.  Except as to matters regarding the internal affairs of the Lender and issues of or limitations on any personal liability of the shareholders and trustees of the Lender for obligations of the Lender, as to which the laws of the State of Maryland shall govern, this Agreement, the Loan Documents and any other instruments executed and delivered to evidence, complete or perfect the transactions contemplated hereby and thereby shall be interpreted, construed, applied and enforced in accordance with the laws of The Commonwealth of Massachusetts applicable to contracts between residents of Massachusetts which are to be performed entirely within Massachusetts, regardless of (i) where any such instrument is executed or delivered; or (ii) where any payment or other performance required by any such instrument is made or required to be made; or (iii) where any breach of any provision of any such instrument occurs, or any cause of action otherwise accrues; or (iv) where any action or other proceeding is instituted or pending; or (v) the nationality, citizenship, domicile, principal place of business, or jurisdiction of organization or domestication of any party; or (vi) whether the laws of the forum jurisdiction otherwise would apply the laws of a jurisdiction other than The Commonwealth of Massachusetts; or (vii) any combination of the foregoing.

16.     Modification of Agreement.  No modification or waiver of any provision of this Agreement, nor any consent to any departure by the Guarantor therefrom, shall in any event be effective unless the same shall be in writing and signed by the Lender, and such modification, waiver or consent shall be effective only in the specific instances and for the purpose for which given.  No notice to or demand on the Guarantor in any case shall entitle the Guarantor to any other or further notice or demand in the same, similar or other circumstances.  This Agreement may not be amended except by an instrument in writing executed by or on behalf of the party against whom enforcement of such amendment is sought.

17.     Waiver of Rights by the Lender.  Neither any failure nor any delay on the Lender's part in exercising any right, power or privilege under this Agreement shall operate as a waiver thereof, nor shall a single or partial exercise thereof preclude any other or further exercise or the exercise of any other right, power or privilege.

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18.     Severability.  In case any one or more of the provisions contained in this Agreement should be invalid, illegal or unenforceable in any respect, the validity, legality and enforceability of the remaining provisions contained herein shall not in any way be affected or impaired thereby, but this Agreement shall be reformed and construed and enforced to the maximum extent permitted by applicable law.

19.     Entire Contract.  This Agreement constitutes the entire agreement between the parties hereto with respect to the subject matter hereof and shall supersede and take the place of any other instruments purporting to be an agreement of the parties hereto relating to the subject matter hereof.

20.     Headings; Counterparts.  Headings in this Agreement are for purposes of reference only and shall not limit or otherwise affect the meaning hereof.  This Agreement may be executed in any number of counterparts, each of which shall be an original, but all of which together shall constitute one instrument, and in pleading or proving any provision of this Agreement, it shall not be necessary to produce more than one of such counterparts.

21.     Remedies Cumulative.  No remedy herein conferred upon the Lender is intended to be exclusive of any other remedy, and each and every remedy shall be cumulative and shall be in addition to every other remedy given hereunder or now or hereafter existing at law or in equity or by statute or otherwise.

22.     NON-LIABILITY OF TRUSTEES.  THE DECLARATION OF TRUST ESTABLISHING THE LENDER, A COPY OF WHICH, TOGETHER WITH ALL AMENDMENTS THERETO (THE "DECLARATION"), IS DULY FILED WITH THE DEPARTMENT OF ASSESSMENTS AND TAXATION OF THE STATE OF MARYLAND, PROVIDES THAT THE NAME "SNH ALT MORTGAGED PROPERTIES TRUST" REFERS TO THE TRUSTEES UNDER THE DECLARATION COLLECTIVELY AS TRUSTEES, BUT NOT INDIVIDUALLY OR PERSONALLY, AND THAT NO TRUSTEE, OFFICER, SHAREHOLDER, EMPLOYEE OR AGENT OF THE LENDER SHALL BE HELD TO ANY PERSONAL LIABILITY, JOINTLY OR SEVERALLY, FOR ANY OBLIGATION OF OR CLAIM AGAINST, THE LENDER.  ALL PERSONS DEALING WITH THE LENDER, IN ANY WAY, SHALL LOOK ONLY TO THE ASSETS OF THE LENDER FOR THE PAYMENT OF ANY SUM OR THE PERFORMANCE OF ANY OBLIGATION.

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IN WITNESS WHEREOF, the undersigned has caused this Agreement to be duly executed under seal as of the date first above written.



By:/s/ Mark W. Ohlendorf

Mark W. Ohlendorf
          Senior Vice President