Document:

Exhibit
4.1
  	  COMMON STOCK
  	  
  	  COMMON
  STOCK
  
	   
  	   
  
	  THIS CERTIFICATE
  IS TRANSFERABLE IN

  CANTON, MA AND JERSEY CITY, NJ
  	   
  
	   
  	   
  
	  Certificate
  	   
  	   
  	  Shares
  
	  Number
  	   
  	   
  	  **600620******
  
	  ZQ 000053
  	   
  	   
  	  ***600620*****
  
	   
  	   
  	   
  	  ****600620****
  
	   
  	   
  	  APPLE
  INC.
  	   
  	  *****600620***
  
	   
  	  INCORPORATED
  UNDER THE LAWS OF THE STATE OF CALIFORNIA
  	  ******600620**
  
	   
  
	  THIS CERTIFIES THAT
  	  MR.
  SAMPLE & MRS. SAMPLE &

  MR. SAMPLE & MRS. SAMPLE
  	   
  
	   
  	   
  	  CUSIP 037833 10
  0
  
	  is the owner of 
  	   
  	   
  
	   
  	   
  	  SEE REVERSE FOR
  CERTAIN DEFINITIONS AND A STATEMENT AS TO THE RIGHTS, PREFERENCES, PRIVILEGES
  AND RESTRICTIONS OF SHARES
  
	   
  	  *  *  *
  SIX HUNDRED THOUSAND

  SIX HUNDRED AND TWENTY *  *  *
  	   
  
							

   
  FULLY PAID AND
NON-ASSESSABLE SHARES OF THE COMMON STOCK, WITHOUT PAR VALUE, OF Apple Inc. transferable on the books of the Corporation by
the holder hereof, in person or by duly authorized attorney, upon surrender of
this certificate properly endorsed. This certificate is not valid until
countersigned by the Transfer Agent and registered by the Registrar.
  Witness the
facsimile seal of the Corporation and the fascimile signatures of its duly
authorized officers.
  	  /s/ Peter Oppenheimer
  	  
  

  APPLE INC.
  	  DATED Aug. 30,
  2002
  

  COUNTERSIGNED AND REGISTERED:
  COMPUTERSHARE INVESTOR SERVICES, LLC.
  
	  Senior Vice President and
  	   
  	  (CHICAGO)
  
	  Chief Financial Officer
  	  INCORPORATED
  	  TRANSFER AGENT
  AND REGISTRAR,
  
	   
  	  JAN 3, 1977
  	   
  
	   
  	   
  	   
  
	  /s/ Donald J.
  Rosenberg
  	  CALIFORNIA
  	   
  
	  Senior Vice President, General Counsel
  	   
  	  By
  	   
  	   
  
	  and Secretary
  	   
  	  AUTHORIZED SIGNATURE
  
	   
  	   
  	   
  
	  SECURITY INSTRUCTIONS ON REVERSE
  

   
  

    APPLE INC.
  The Company is authorized
to issue Common Stock and Preferred Stock. The Board of Directors of the
Company has authority to fix the number of shares and the designation of any
series of Preferred Stock and to determine or alter the rights, preferences,
privileges, and restrictions granted to or imposed upon any unissued shares of
Preferred Stock.
  A statement of the
rights, preferences, privileges, and restrictions granted to or imposed upon
the respective classes or series of shares and upon the holders thereof as
established, from time to time, by the Articles of incorporation of the Company
and by a certificate of determination, the number of shares constituting each
class and series, and the designations thereof, may be obtained by the holder
hereof upon request and without charge from the Transfer Agent of the Company
at its offices in Boston or New York.
  	  The following abbreviations, when used in the
  inscription on the face of this certificate, shall be construed as though
  they were written out in full according to applicable laws or regulations:
  
	   
  
	  TEN COM
  	  - as tenants in common
  	  UNIF TRF MIN ACT
  	   
  	  Custodian
  	   
  	   
  
	   
  	   
  	   
  	  (Cust)
  	  (Minor)
  
	  TEN ENT
  	  - as tenants by the entireties
  	  under
  Uniform Transfers to Minors Act
  	   
  	   
  
	   
  	   
  	   
  	   
  	  (State)
  
	  JT TEN
  	  - as joint tenants with right of survivorship

    and not as tenants in common
  	   
  	   
  	   
  
	   
  	   
  	   
  	   
  	   
  
	  Additional
  abbreviations may also be used though not in the above list.
  
											

   
  For value received, _______________
hereby sell, assign and transfer onto
  	  PLEASE INSERT SOCIAL SECURITY
  	   
  	   
  
	  OR OTHER IDENTIFYING NUMBER
  	   
  	   
  
	  OF ASSIGNEE
  	   
  	   
  
	   
  	   
  	   
  
	   
  
	   
  
	  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS,
  INCLUDING POSTAL ZIP CODE, OF ASSIGNEE)
  
	   
  
	   
  
	   
  	  shares
  
	  of the capital stock represented by the within
  Certificate, and do hereby irrevocably constitute and appoint
  
	   
  	  Attorney
  
	  to transfer the said stock on the books of the
  within named Corporation with full power of substitution in the premises.
  
					

   
   
  	  Dated:
  	   
  	  20
  	   
  	   
  	  Signature:
  	   
  
	   
  	   
  
	   
  	   
  
	   
  	  Signature:
  	   
  
	   
  	   
  	  Notice:
  	  THE SIGNATURE(S) TO THIS ASSIGNMENT MUST CORRESPOND
  WITH THE NAME(S) AS WRITTEN UPON THE FACE OF THE CERTIFICATE IN EVERY
  PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT, OR ANY CHANGE WHATEVER.
  

   
  	  SECURITY INSTRUCTIONS
  	   
  
	   
  	  
  
	  THIS IS
  WATERMARKED PAPER, DO NOT ACCEPT WITHOUT NOTING WATERMARK. HOLD TO LIGHT TO
  VERIFY WATERMARK.Exhibit 10.5

FIRST AMENDMENT TO
PURCHASE AND SALE AGREEMENT

THIS FIRST AMENDMENT TO PURCHASE AND SALE AGREEMENT (“Amendment”) is hereby made and
entered into effective as of the 5th day of January, 2007 by and between
KDC-CAROLINA INVESTMENTS 3, LP, a Delaware limited partnership (“Seller”), and 3D SYSTEMS
CORPORATION, a Delaware corporation (“Purchaser”).

WHEREAS, Seller and Purchaser have entered into that
certain Purchase and Sale Agreement (the “Purchase Contract”)
with respect to the 3D Systems Corporation Headquarters Building, Rock Hill,
South Carolina, dated December 18, 2006; and

WHEREAS, Section 3.1.1 of the Contract allowed
the Purchaser an Inspection Period (as defined in the Purchase Contract) that
expired January 2, 2007; and

WHEREAS, Purchaser had not as of such date secured its
financing commitment for the acquisition of the Property (as defined in the
Purchase Contract) and Purchaser did not make the Subsequent Deposit required
by Section 2.2.1 of the Contract on January 2, 2007 and Purchaser
terminated the Contract on such date; and

WHEREAS, Purchaser still desires to purchase the
Property and Seller desires to sell the Property to Purchaser, under the terms
and conditions of the Purchase Contract as amended by and subject to the terms
and conditions of this Amendment.

NOW, THEREFORE, for Ten Dollars and other good and
valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, Seller and Purchaser hereby agree as follows:

1.   Undefined Terms.   All capitalized but undefined
terms used herein shall have the meaning given such terms in the Purchase
Contract.

2.   Reinstatement of Purchase Contract.   The
Purchase Contract is reinstated, as modified hereby, as if the Purchase
Contract had not been terminated by Purchaser.

3.   Release of Initial Deposit.   The Initial Deposit
shall be released the Title Company to Seller on January 5, 2007 and shall
be deemed fully earned by Seller and non-refundable to Purchaser
notwithstanding any other provision in the Purchase Contract; provided,
however, that the Initial Deposit will be applied to the Purchase Price at
Closing.

4.   Extension of Inspection Period and Subsequent Deposit.   Section 2.2.1
of the Purchase Contract shall be and hereby is revised to change the date “January 2,
2007” in such Section to “January 15, 2007.” Upon deposit by
Purchaser of the Subsequent Deposit on January 15, 2007, the Subsequent
Deposit shall be deemed fully earned by Seller, the Title Company shall wire
transfer the Subsequent Deposit to Seller and Purchaser shall be deemed to
waived its rights to terminate the Purchase Contract under Section 3.1.1,
as modified hereby. The last sentence of Section 3.1.1 of the Purchase
Contract shall be and hereby is revised to read as follows: “If Purchaser is
not satisfied with the Investigations or for any other reason, or no reason,
determines that Purchaser does not want to close the acquisition of the
Property pursuant to this Agreement, Purchaser shall, on or before 5:00 PM Rock
Hill, South Carolina time on January 15, 2007 (the period from the
Effective Date until such date being the “Inspection Period”),
provide written notice of termination of this Agreement to Seller and
thereafter neither Purchaser nor Seller shall have any further rights or
obligations hereunder, other than those that expressly survive the termination
of this Agreement.”

5.   Payments for Tenant Finish Under Lease.   Purchaser
shall on January 5, 2007, wire transfer to Seller the sum of $447,451.20
for Tenant Improvement Costs under the Lease. Seller and Purchaser acknowledge
and agree that Purchaser is holding back an additional $25,000 in Tenant
Improvement Costs under the Lease until such time as Seller completes the Punch
List Items (as defined in the Lease). Purchaser agrees to pay the remaining
$25,000 to Seller within 3 business days after Seller completes such Punch List
Items.

6.   Failure of Purchaser to Make Payments.   In the
event that Purchaser does not make either or both of the payments required by
paragraphs 3 and 5 of this Amendment on or before 5:00 PM Rock Hill, South
Carolina time on January 5, 2007, Seller shall have the right to terminate
this Amendment by written notice to Purchaser.

7.   No Further Revisions.   Except as modified
hereby, the Lease and the Purchase Agreement shall remain in full force and
effect.

IN
WITNESS WHEREOF, Seller and Purchaser have executed this Amendment as of the
date first above written.

	
  SELLER:

  	
  KDC-CAROLINA INVESTMENTS 3, LP, 

  
	
   

  	
  a Delaware limited partnership

  
	
   

  	
  By:

  	
  KDC-Carolina Investments
  3 GP, LLC, 

  
	
   

  	
   

  	
  a Delaware limited liability company, 

  
	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
  By:

  	
  Koll Development Company
  I, LP, 

  
	
   

  	
   

  	
   

  	
  a Delaware limited partnership, 

  
	
   

  	
   

  	
   

  	
  its Sole Member

  
	
  Date:                  ,
  2007

  	
   

  	
   

  	
  By:

  	
  SWV, LLC,

  
	
   

  	
   

  	
   

  	
   

  	
  a Delaware limited liability company,

  
	
   

  	
   

  	
   

  	
   

  	
  its General Partner

  
	
   

  	
   

  	
   

  	
   

  	
  By:

  	
  /s/ Tobin C. Grove

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
  Tobin C. Grove, President

  

 

	
  [CORPORATE SEAL]

  	
   

  	
   

  
	
  PURCHASER:

  	
   

  	
  3D SYSTEMS CORPORATION, 

  
	
   

  	
   

  	
  a Delaware corporation

  
	
  Date: 

  	
  January 5,
  2007

  	
   

  	
  By: 

  	
  /s/ Robert M.
  Grace, Jr.,

  
	
   

  	
  [CORPORATE SEAL]

  	
   

  	
   

  	
  Printed Name:

  	
  Robert M. Grace, Jr.

  
	
   

  	
   

  	
   

  	
   

  	
  Title:

  	
  Vice President, Secretary & General 

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
  Counsel

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