BACKGROUND:

                                                                   EXHIBIT 10.59

                            Old Gettysburg Associates
                            0000 Xxx Xxxxxxxxxx Xxxx
                             Xxxxxxxxxxxxx, XX 00000


                        FIFTH ADDENDUM TO LEASE APREEMENT

THIS FIFTH AMENDMENT (this "Fifth Amendment") is made as of the 19th day of
February, 2004, by and between OLD GETTYSBURG ASSOCIATES, a Pennsylvania general
partnership ("Landlord"), and SELECT MEDICAL CORPORATION, a Delaware
corporation ("Tenant").


                                BACKGROUND:

A. Landlord and Tenant are parties to that certain Office Lease Agreement dated
   June 15, 1999, (as amended by the First, Second, Third, Fourth Addendum
   thereto, the "Lease") pursuant to which Landlord leased to Tenant, and Tenant
   hired from Landlord, approximately 12,225 rentable square feet of space in
   the building located at 0000 Xxx Xxxxxxxxxx, Xxxx, Xxxxxxxxxxxxx,
   Xxxxxxxxxxxx. All capitalized terms not otherwise defined herein shall have
   the meanings ascribed to them in the Lease.

B. Landlord and Tenant now desire to amend the Lease as hereinafter set forth.


NOW, THEREFORE, in consideration of the mutual covenants and promises contained
herein, and intending to be legally bound hereby, Landlord and Tenant agree as
follows:

   Effective on February 19,2004, the following terms contained in the Basic
   Lease shall be amended as follows:

   1. Tenant agrees to relinquish 695 RSF in area known as Suite 407.

   2. Total area of the premises will consist of 11,530 rather than 12,225 sq
      ft.

   3. From February 19,2004 monthly rental rate for the entire 11,530 SF is
      $19,495.31 or a total Annual Base Rental rate of $233,943.70.

   All other terms and conditions contained in the Lease and not amended hereby
   remain in full force and effect.

IN WITNESS WHEREOF, Landlord and Tenant have caused this Fifth Amendment to be
duly executed as of August 19, 2004


                                    Landlord:

                                    OLD GETTYSBURG ASSOCIATES
                                    a Pennsylvania general partnership

Witness: /s/ illegible              By: /s/ Xxxx Xxxxxxxx
        ----------------------          ---------------------     Date: 8/19/04
                                            Xxxx Xxxxxxxx
                                            General Partner


                                    Tenant:

                                    SELECT MEDICAL CORPORATION
                                    a Delaware Corporation

Attest: /s/ Xxxxxxx Xxxxxx          By: /s/ Xxxxx X. Xxxxxxxxx    Date: 9/15/04
        ----------------------          ----------------------
            Xxxxxxx Xxxxxx                  Xxxxx X. Xxxxxxxxx
            Secretary                       Vice President