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Exhibit 10.4

Old Gettysburg Associates II
4720 Old Gettysburg Road
Mechanicsburg, PA 17055

Third Addendum to Lease Agreement

THIS THIRD AMENDMENT (this third Amendment) is made as of the 26th day of
February 2002, by and between OLD GETTYSBURG ASSOCIATES II, a Pennsylvania
limited partnership (Landlord) and SELECT MEDICAL CORPORATION, a Delaware
corporation (Tenant).

BACKGROUND:



| | A. |  | Landlord and Tenant are parties to certain Office Lease Agreement
dated May 1, 2001 (the Lease), and Amendments I and II dated February
2002. All capitalized terms not otherwise defined herein shall have the
meanings ascribed to them in the Lease.
| | -- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
| | B. |  | Tenant now desires to lease additional space.                                                                                                                                                                                                            
|
| |    |  | 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 May 1, 2002, the following terms contained in the Basic
Lease Information shall be amended as follows:                                                                                                                                      



| | 1. |  | Tenant agrees to lease an additional 5,577 RSF, known
as Suites 309 & 311.                                            
| | -- |  | ----------------------------------------------------------------------------------------------------------------------
|
| | 2. |  | Total area of the premises will be amended to 11,414
RSF.                                                             
|
| | 3. |  | Tenants Proportionate Share will be 27%.                                                                             
|
| | 4. |  | The current monthly rental rate for the additional
spaces will be $8,458.45.                                          
|
| | 5. |  | Monthly rental rate for the entire 11,414 RSF is
$17,311.23 or a total Initial Annual Base Rental rate of
$207,734.80.
|
| | 6. |  | Owner will give Tenant a Tenant Improvement Allowance
of $5.00 per RSF or $27,885 to build out the new space.         



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





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| |  |  | IN WITNESS WHEREOF, Landlord and Tenant have caused this Third
Amendment to be duly executed as of February 26, 2002.
| |  |  | ---------------------------------------------------------------------------------------------------------------------

| |          |  |                             |  |                                                                           |  |                                    |  |              
| | -------- |  | --------------------------- |  | ------------------------------------------------------------------------- |  | ---------------------------------- |  | -------------
| |          |  |                             |  | Landlord:
Old Gettysburg Associates II
A Pennsylvania limited partnership |  |                                   
|
|
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| |          |  |                             |  |                                                                           |  |                                    | 
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| | Witness: |  | /s/ Laura J. Martin         |  | By:                                                                       |  | /s/ Michael E. Salerno             |  | Date: 3/5/02 
| |          |  |                             |  |                                                                           |  |                                    |  |              
| |          |  |                             |  |                                                                           |  | Michael E. Salerno
Agent for Owner |  |              
|
|
|
|
| |          |  |                             |  |                                                                           |  |                                    |  |              
|
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|
|
| |          |  |                             |  | Tenant:
Select Medical Corporation
A Delaware Corporation                 |  |                                   
|
|
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| |          |  |                             |  |                                                                           |  |                                    | 
|
|
|
|
| | Attest:  |  | /s/ Michael E. Tarvin       |  | By:                                                                       |  | /s/ Scott A. Romberger             |  | Date: 2/26/02
| |          |  |                             |  |                                                                           |  |                                    |  |              
| |          |  | Michael E. Tarvin
Secretary |  |                                                                           |  | Scott A. Romberger
Vice President  |  |              

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