Amended Statement of Beneficial Ownership


UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. 2)*

Senior Housing Properties Trust
(Name of Issuer)

COMMON
(Title of Class of Securities)

81721M109
(CUSIP Number)

Date of Event which Requires Filing of this Statement

December 31, 2011

Check the appropriate box to designate the rule pursuant to which the Schedule
is filed:

[x] Rule 13d-1(b)
[ ] Rule 13d-1(c)
[ ] Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in prior coverage.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SEC 1745 (12-02)

Schedule 13G (continued)

CUSIP No. 81721M109
--------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Cohen & Steers, Inc. 14-1904657
--------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [ ]
                                                             (b)  [x]
--------------------------------------------------------------------------------
   3   SEC USE ONLY


--------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       Delaware
--------------------------------------------------------------------------------
   NUMBER OF      5    SOLE VOTING POWER
     SHARES            5,550,493
  BENEFICIALLY    -------------------------------------------------------------
    OWNED BY      6    SHARED VOTING POWER
      EACH             0
   REPORTING      -------------------------------------------------------------
     PERSON       7    SOLE DISPOSITIVE POWER
      WITH             13,304,290
                  -------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER
                       0
--------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       13,304,290
--------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

       [ ]
--------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       8.18%
--------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       HC, CO
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT



Schedule 13G (continued)

CUSIP No. 81721M109
--------------------------------------------------------------------------------
   1   NAME OF REPORTING PERSON
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

       Cohen & Steers Capital Management, Inc.     13-3353336
--------------------------------------------------------------------------------
   2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [ ]
                                                             (b)  [x]
--------------------------------------------------------------------------------
   3   SEC USE ONLY


--------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       New York
--------------------------------------------------------------------------------
   NUMBER OF      5    SOLE VOTING POWER
     SHARES            5,550,493
  BENEFICIALLY    -------------------------------------------------------------
    OWNED BY      6    SHARED VOTING POWER
      EACH             0
   REPORTING      -------------------------------------------------------------
     PERSON       7    SOLE DISPOSITIVE POWER
      WITH             13,179,037
                  -------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER
                       0
--------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       13,179,037
--------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

       [ ]
--------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       8.10%
--------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       IA, CO
--------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT




Schedule 13G (continued)

CUSIP No.  81721M109
-------------------------------------------------------------------------------
1)  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (entities only)

    Cohen & Steers Europe S.A.
-------------------------------------------------------------------------------
2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                          (a) [ ]
                                                          (b) [x]
-------------------------------------------------------------------------------
3)  SEC USE ONLY


-------------------------------------------------------------------------------
4)  CITIZENSHIP OR PLACE OF ORGANIZATION

    Belgium
-------------------------------------------------------------------------------
    NUMBER        5)   SOLE VOTING POWER
    OF                 0
    SHARES        -------------------------------------------------------------
    BENEFICIALLY  6)   SHARED VOTING POWER
    OWNED BY           0
    EACH          -------------------------------------------------------------
    REPORTING     7)   SOLE DISPOSITIVE POWER
    PERSON             125,253
    WITH          -------------------------------------------------------------
                  8)   SHARED DISPOSITIVE POWER
                       0
-------------------------------------------------------------------------------
9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

    125,253
-------------------------------------------------------------------------------
10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ]

-------------------------------------------------------------------------------
11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

    0.08%
-------------------------------------------------------------------------------
12) TYPE OF REPORTING PERSON

    IA, CO
-------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!





Schedule 13G (continued)


Item 1.

        (a)  Name of Issuer:
             Senior Housing Properties Trust

        (b)  Address of Issuer's Principal Executive Offices:
             400 Center Street
             Newton, MA 02458
Item 2.

        (a)  Name of Persons Filing:
               Cohen & Steers, Inc.
               Cohen & Steers Capital Management, Inc.
        (b)  Address of Principal Business Office for Cohen & Steers, Inc.
             and Cohen & Steers Capital Management, Inc. is:
               280 Park Avenue
               10th Floor
               New York, NY 10017
        (c)  Citizenship:
               Cohen & Steers, Inc: Delaware corporation
               Cohen & Steers Capital Management, Inc: New York corporation
        (d)  Title of Class Securities:
               Commmon
        (e)  CUSIP Number:
              81721M109


Item 3.     If this statement is filed pursuant to Rule 13d-l(b), or
            13d-2(b), check whether the person filing is a

            (a)  [ ]  Broker or Dealer registered under Section 15 of the Act

            (b)  [ ]  Bank as defined in Section 3(a)(6) of the Act

            (c)  [ ]  Insurance Company as defined in section 3(a)(19) of
                      the Act
            (d)  [ ]  Investment Company registered under Section 8 of the
                      Investment Company Act

            (e)  [x]  An investment advisor in accordance with Section
                      240.13d-1(b)(1)(ii)(E)

            (f)  [ ]  An employee benefit plan or endowment fund in accordance
                      with 240.13d-1(b)(1)(ii)(F)

            (g)  [x]  A parent holding company or control person in accordance
                      with Section 240.13d-l(b)(1)(ii)(G)

            (h)  [ ]  A savings association as defined in Section 3(b) of the
                      Federal Deposit Insurance Act (12 U.S.C. 1813)

            (i)  [ ]  A church plan that is excluded from the definition of an
                      investment company under section 3(c)(14) of the
                      Investment Company Act of 1940 (15U.S.C. 80a-3)

            (j)  [ ]  Group, in accordance with Section 240.13d-1(b)(l)(ii)(J)



Item 4.    OWNERSHIP:

         (a) Amount Beneficially Owned as of December 31, 2011:

               See row 9 on cover sheet

         (b) Percent of Class:

               See row 11 on cover sheet


          (c) Number of shares as to which such person has:
                (i)   sole power to vote or direct the vote:
                         See row 5 on cover sheet

                (ii)  shared power to vote or direct the vote:
                         See row 6 on cover sheet

                (iii) sole power to dispose or to direct
                      the disposition of:
                          See row 7 on cover sheet

                (iv)  shared power to dispose or direct
                      the disposition of:
                          See row 8 on cover sheet



Item 5.  OWNERSHIP  OF 5% OR LESS OF A CLASS
         N/A

Item 6.  OWNERSHIP OF MORE THAN 5% ON BEHALF OF ANOTHER PERSON
         N/A

Item 7.  IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
         ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT
         HOLDING COMPANY

         Cohen & Steers, Inc. holds a 100% interest in Cohen & Steers Capital
         Management, Inc., an investment advisor registered under Section 203
         of the Investment Advisers Act. Cohen & Steers, Inc. and Cohen &
         Steers Capital Management, Inc. together hold a 100% interest in
         Cohen & Steers Europe S.A., an investment advisor registered under
         Section 203 of the Investment Advisers Act.

Item 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

         Cohen & Steers, Inc. holds a 100% interest in Cohen & Steers Capital
         Management, Inc., an investment advisor registered under Section 203
         of the Investment Advisers Act. Cohen & Steers, Inc. and Cohen &
         Steers Capital Management, Inc. together hold a 100% interest in
         Cohen & Steers Europe S.A., an investment advisor registered under
         Section 203 of the Investment Advisers Act.



Item 9.  NOTICE OF DISSOLUTION OF GROUP

         N/A



Item 10. Certification

By signing below I certify  that,  to the best of my knowledge  and belief,
the securities  referred to above were  acquired and are held in the ordinary
course of business and were not  acquired and are not held for the purpose of
or with the effect of changing or  influencing  the  control  of the  issuer
of such  securities  and were not acquired and are not held in connection with
or as a participant in any transaction  having that purposes or effect.

Signature

After  reasonable  inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true,
complete and correct.

Date:  February 14, 2012

                        Cohen & Steers, Inc.
                        Cohen & Steers Capital Management, Inc.
                        By:

                        /s/ Lisa Phelan
                        ____________________________________________
                            Signature

                            Lisa Phelan, Senior Vice President,
                            Chief Compliance Officer
                            Cohen & Steers, Inc.
                            Cohen & Steers Capital Management, Inc.
                        ____________________________________________
                            Name and Title


                        Cohen & Steers Europe S.A.
                        By:

                        /s/ Joseph Houlihan
                        ---------------------------------------
                            Signature

                            Joseph Houlihan, Managing Director
                            Cohen & Steers Europe S.A.
                        ____________________________________________
                            Name and Title




                    JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)  promulgated under the Securities
Exchange Act of 1934, as amended, the undersigned  hereby agree to the joint
filing with all other Reporting Persons (as such term is defined in the
Schedule 13G referred to below)  on behalf  of each of them of a  Statement
on  Schedule  13G  including amendments thereto with respect to the Common
Shares of Senior Housing Properties Trust and that this  Agreement  may be
included as an Exhibit to such joint filing. This Agreement may be executed
in any number of counterparts, all of which together shall constitute one and
the same instrument.

         IN WITNESS WHEREOF, the undersigned hereby execute this Agreement as
of February 14, 2012.


                        Cohen & Steers, Inc.
                        Cohen & Steers Capital Management, Inc.
                        By:

                        /s/ Lisa Phelan
                        ____________________________________________
                            Signature

                            Lisa Phelan, Senior Vice President,
                            Chief Compliance Officer
                            Cohen & Steers, Inc.
                            Cohen & Steers Capital Management, Inc.
                        ____________________________________________
                            Name and Title


                        Cohen & Steers Europe S.A.
                        By:

                        /s/ Joseph Houlihan
                        ---------------------------------------
                            Signature

                            Joseph Houlihan, Managing Director
                            Cohen & Steers Europe S.A.
                        ____________________________________________
                            Name and Title