Exhibit
10.1


FOURTH AMENDMENT TO LEASE AGREEMENT


THIS FOURTH AMENDMENT TO LEASE AGREEMENT (“Fourth Amendment”) is hereby made and
entered into this 26th day of February, 2007, by and between
KDC-CAROLINA INVESTMENTS 3, LP, a Delaware limited partnership (“Landlord”), and 3D SYSTEMS
CORPORATION, a Delaware corporation (“Tenant”).


R E C I T A L S:


WHEREAS, Landlord and Tenant have heretofore entered into that certain
Lease Agreement dated February 8, 2006 (the “Lease Agreement”); and


WHEREAS, Landlord and Tenant amended the Lease Agreement pursuant to
the terms and conditions of that certain First Amendment to Lease Agreement
dated effective as of June 15, 2006 (the “First Amendment”), that
certain Second Amendment to Lease Agreement dated effective as of October 6,
2006 (the “Second Amendment”) and that certain Third Amendment to Lease
Agreement dated effective as of December 18, 2006 (the “Third Amendment”);
and


WHEREAS, Exhibit F to the Lease Agreement provides, among other things,
that in the event that certain Scope Changes (as defined in Exhibit F to the
Lease Agreement) occur, either (a) Base Rent (as defined in the Lease
Agreement) will be adjusted as provided for in Exhibit F, or (b) Tenant shall
have the right to fund all or such portion of such excess costs in which case
Base Rent will not be adjusted as a result of such Tenant expenditures; and


WHEREAS, Landlord and Tenant desire to further amend the Lease
Agreement, as amended by the First Amendment, Second Amendment and Third
Amendment, as set forth in this Fourth Amendment and to set forth agreed upon
adjustments to Base Rent in order to execute an Acknowledgment Letter (in the
form of Exhibit E to the Lease Agreement) as required pursuant to the terms of
the Lease Agreement.


A G R E E M E N T:


NOW, THEREFORE, for and in consideration of the premises and Ten
Dollars and other good and valuable consideration, the receipt and sufficiency
of which are hereby acknowledged, Landlord and Tenant hereby agree as follows:


1.             Defined Terms.  All capitalized but undefined terms used in
this Fourth Amendment shall have the meaning given such terms in the Lease
Agreement.


2.             Initial Term.  Each party acknowledges that Section 4(a) is
hereby amended to reflect the mutual understanding that the Commencement Date
and the Rent Commencement Date of the Initial Term is November 22, 2006 and the
Expiration Date of the Initial Term shall be at 11:59 p.m. (Rock Hill, South
Carolina local time) on August 31, 2021, the 177th month following the Commencement Date.


3.             Base Rent and Additional Rent.  Pursuant to Exhibit E to the Lease Agreement,
each party acknowledges that Section 5(a) of the Lease is hereby amended as
follows:


a.               The Rent Commencement Date under
the Lease is November 22, 2006.


b.              Base Rent amounts are amended as
follows:











 




	
  Lease Period

  	
   

  	
  Monthly Base Rent

  	
   

  
	
  Months 1-57

  	
   

  	
  $

  	
  55,133

  	
   

  
	
  Months 58-117

  	
   

  	
  $

  	
  58,443

  	
   

  
	
  Months 118-177

  	
   

  	
  $

  	
  61,940

  	
   

  






 


4.             Renewal of the Term.  Each party acknowledges that the Tenant has
paid certain Tenant Improvement Costs pursuant to the Lease, as amended by the
First Amendment, Second Amendment and Third Amendment.  In recognition of the fact that Tenant has
paid these amounts, the computation of any future rental rate in connection
with the Renewal Terms shall be computed without regard to the cost or value of
these Tenant Improvements, so that Tenant is not required to pay again for such
Tenant Improvements (although Landlord acknowledges that Tenant has paid for
same). Section 6(c) of the Lease is hereby amended to reflect the mutual
understanding that the computation of Fair Market Rent will not include such
Tenant Improvement Costs and that in considering “comparable buildings located
in the Rock Hill, South Carolina area and that are comparable in size, design,
and quality to the Building” as required by such Sections in determining Fair
Market Rent, such “quality of the building” shall exclude such the Tenant
Improvement Costs paid by the Tenant.


5.             No Further Amendment.  The Lease Agreement shall remain in full force
and effect, as modified by the First Amendment, the Second Amendment, the Third
Amendment and this Fourth Amendment.


IN WITNESS WHEREOF, Landlord and Tenant have executed this Fourth
Amendment effective as of the date first above written.


 


	
  

  	
   

  	
  LANDLORD:

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  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

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
  By:

  	
   

  	
  SWV, LLC,

  a Delaware limited liability company, its General Partner

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
  By:

  	
   

  	
  /s/ Tobin C.
  Grove

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
  Tobin C. Grove,
  President

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  



 











 


	
  

  	
   

  	
  TENANT:

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  3D SYSTEMS
  CORPORATION,

  
	
   

  	
   

  	
  a Delaware
  corporation

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
  By:

  	
   

  	
  /s/ Abraham N.
  Reichental

  
	
   

  	
   

  	
   

  	
   

  	
  Abraham N.
  Reichental

  
	
   

  	
   

  	
   

  	
   

  	
  President and
  Chief Executive Officer