EXHIBIT 10.23  
 Keppel Logistics
  ADDENDUM TO LEASE AGREEMENT
 
 Keppel Logistics Pte Ltd                                                       Other logistics centres:
 
 (Co Reg No. 197302345E)                                                       • 44 Benoi Road, Singapore 629904
 
 HeadOffice• 27 Benoi Sector, Singapore 629859
 
 7 Gul Circle
 
 Singapore 629563
 
 Tel: (65) 68611911
 
 Fax: (65) 68612168
 
 E-mail: keplog@keppellog.com
 
 This Addendum No: 2010/678 is made on the 1 June 2010 between KEPPEL LOGISTICS PTE LTD, a Company incorporated under the laws of Singapore having its registered office at 1 Harbour Front Avenue, #18-01 Keppel Bay Tower, Singapore 098632 (hereinafter called "the Lessor") and AFFYMETRIX PTE LTD, a Company incorporated under the laws of Singapore having its principal place of business at No.7 Gul Circle, #2M01 -10, Singapore 629563 (hereinafter called "the Lessee").
  NOW IT IS HEREBY AGREED as follows:
 
 1.          Option for Extension:
 
 The Lessee agrees to exercise its lease option in accordance with the Agreement for Lease for a period of Five (5) years only.
  The extended lease shall commence on 1st January 2011 and expire on 31st December 2015 based on the revised rent as set out in Schedule 1.
 
 The Lessee may lease the premises for Two (2) further extensions of five (5) years each after 31st December 2015, provided that the Lessee shall no more than twelve (12) months nor less than six (6) months before the expiration of each extension of the Lease, give to the Lessor notice in writing of his desire and if the Lessee shall have paid all rent payable and shall have performed and observed the terms and conditions in the Lease Agreement up to the termination of the tenancy hereby created, the Lessor will let the Premises to the Lessee for a further term of Five (5) years at a rent to be decided between the Lessor, subject to any increase or decrease in rent not exceeding 10% of the rent in the preceding term, and the Lessee and upon the covenants and conditions contained in the Lease.
 
 All other terms and conditions as per Lease Agreement signed and dated 13 February 2006 remains unchanged.
 
 
 
 
 
 “All business is transacted only in accordance with the Singapore Logistics Association Standard Trading Conditions (2004). Copy is available upon application”
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 Keppel Logistics
  IN WITNESS whereof, the parties hereinafter set their respective hands the day and year first above written.
 
 For and on behalf of                                                                                                                                      For and on behalf of
 KEPPEL LOGISTICS PTE LTD                                                                                                                AFFYMETRIX PTE LTD
 /s/ Gui Eng Hwee                                                                                                                                          /s/ Choy Kem Wah
 Name: GUI ENG HWEE                                                                                                                                Name: Choy Kem Wah
 Title: Chief Executive Officer                                                                                                                    Title: Vice President & General Manager
   Company's Stamp                                                                                                                                         Company's Stamp
   Witnessed By:                                                                                                                                               Witnessed By:
 /s/ Desmond Boo                                                                                                                                          /s/ Eunice Wong
 Name: DESMOND BOO                                                                                                                              Name: Eunice Wong
 Title: General Manager                                                                                                                               Title: Director, Materials














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 KeppelLogistics
 
 AFFYMETRIX PTE LTD
 
 SCHEDULE 1
 
 RATE SCHEDULE
 
 SINGAPORE DOLLARS
 
 Page 1 of 1
 
 DESCRIPTION                                                                                              UNIT PRICE
  A)           REVISED RENTAL FOR FIVE (5) YEARS RENEWAL
 
 
 S/N     Description                                                                                         Rental Rates (S$/per S/N
 per calendar month)
 
 Rental Rates Effective 1st Year from 1st Jan 2011 to 31 Dec 2011
 
 1          Warehouse Space, 3rd Floor - 136,000 sq ft                                    $132,440
 
 2          Office Space - Unit No. #2M01-08 - 9170 sq ft                                $13,800
 
 3          Office Space - Unit No. #2M09-10 -1875 sq ft                                 $3,562.50
 
 4          Roof Top Open Space                                                                        $780
 
 Rental Rates Effective 2nd Year from 1st Jan 2012 to 31 Dec 2012
 
 1          Warehouse Space, 3rd Floor - 136,000 sq ft                                    $133,050
 
 2          Office Space - Unit No. #2M01-08 - 9170 sq ft                                $13,865
 
 3          Office Space - Unit No. #2M09-10 -1875 sq ft                                 $3,562.50
 
 4          Roof Top Open Space                                                                        $780
 
 Rental Rates Effective 3rd Year from 1st Jan 2013 to 31 Dec 2013
 
 1          Warehouse Space, 3rd Floor - 136,000 sq ft                                    $134,900
 
 2          Office Space - Unit No. #2M01-08 - 9170 sq ft                                $14,055
 
 3          Office Space - Unit No. #2M09-10 -1875 sq ft                                 $3,562.50
 
 4          Roof Top Open Space                                                                        $780
    
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 Keppel Logistics
  Rental Rates Effective 4th and 5th Year from 1st Jan 2014 to 31 Dec 2015
 
 1          Warehouse Space, 3rd Floor - 136,000 sq ft                                    $135,500
 
 2          Office Space - Unit No. #2M01-08 - 9170 sq ft                                $14,120
 
 3          Office Space - Unit No. #2M09-10 -1875 sq ft                                 $3,562.50
 
 4          Roof Top Open Space                                                                        $780
    ** - Rates exclude utility charge and JTC subletting fees.
 - Monthly rent to be paid in advance on the first day of each month.
    THE RATES DO NOT INCLUDE GOODS AND SERVICES TAX (GST).