Exhibit
      10.15









**ADDENDUM**
 **TO
        CLIENT LEASE**
 **[RENT
        SUBSIDY]**
   THIS
        LEASE,
        is made and entered into this 1 st Day of February,
        2007, by and between
        FLAGSHIP ENTERPRISE CENTER, INC., an Indiana not-for-profit corporation Altairnano
        Technologies, Inc., a Nevada Corporation, and Tenant an Indiana Limited Liability
        Corporation (hereinafter called "Tenant").
  Witnesseth
        That:
  **Article** **I.**
 **Leased
        Premises.**
  Section
        1.01. Lease
        and Description of Premises. Landlord,
        for and in consideration
        of the rent, covenants, agreements and conditions stated herein, does hereby
        lease to Tenant and Tenant does hereby lease from Landlord the following
        described premises (hereinafter referred to as the "Leased Premises") situated
        in the Flagship Enterprise Center Building located at 2701 Enterprise Drive,
        Flagship Business Park, Anderson, Indiana 46013 (hereinafter referred to
        as
        "Building") and including all that
        certain space, which is on the second floor of the Flagship Enterprise Center Building
        which is designated **Suite
        #111** consisting
        of **440
        square feet** of
        space
        as shown in
        Exhibit "A." Because of the special nature of Landlord's
        building, Landlord has the option,
        in its sole discretion, to require Tenant to move to comparable space in
        the Building
        during the term of this
        Lease. Tenant may cancel with 30 day notice.














**EXHIBIT
        "B"**
  **RENT
        SCHEDULE**
  **Subsidized
        Rent /  20% Subsidy**
  1st
                    12
                  months
                2nd
                    12
                  months
                3rd
                    12
                  months
                4th
                    12
                  months
                5th
                    12
                  monthsStipulated
                    Fair
                  Market
                    Rent
                $
                    16.00
                $17.00
                $
                    18.00
                $
                    19.00
                $
                    20.0020%
                    Rent Subsidy*
                $
                    3.20
                $
                    3.40
                $
                    3.60
                N/A
                N/AMonthly
                    Rent*
                $
                    12.80
                $
                    13.60
                $
                    14.40
                $
                    19.00
                $
                    20.00
  **Rent
        Calculation**
  During
        the first 12 months of this Lease, Tenant shall pay to Landlord, with respect
        to
        each calendar year or fractional calendar year, as the case may be, total
        rental
        payments in the monthly sum of Five Hundred Eighty Seven Dollars ($ 587.00),
        being the sum of: (a) Subsidized Rent of Four Hundred Seventy Dollars ($
        470.00)
        [being the product of $ 12.80, the subsidized annual
        rent per square foot, and 440 square
        feet, the area of the Leased Premises, divided by 12
        months]; and (b) common area monthly rent of One Hundred Seventeen Dollars
        ($
        117.00), representing a surcharge of twenty-five percent (25%) of the basic
        monthly rent to cover the Landlord's
        cost of maintaining and improving the common areas within the
        building.
  During
        subsequent 12 Month periods of this Lease, by similar calculation, Tenant
        shall pay
        to
        Landlord, with respect to each calendar year or fractional calendar year,
        as the
        case may be, total rental payments as follows:
  2nd12
                    Months:
                $
                    623.00 / Month3rd12
                    Months:
                $
                    660.00 / Month4th12
                    Months
                $
                    871.00 / Month5th12
                    Months
                $
                    917.00 / Month




IN
        WITNESS WHEREOF, the said parties have hereunto set their hands and seals
        this 1st ,  day
        of
        February, 2007.
  Altairnano
                  Technologies, Inc.
              
              Flagship
                  Enterprise CenterLESSEE
              
              LESSORBY:
              
              BY:Chief
                  Financial officer
              
              Arthur
                  L. Patterson, Executive
                  Director