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FOURTH AMENDMENT TO LEASE - PREMISES TOTAL APPROXIMATELY 20,466 RENTABLE SQUARE FEET & CONSIST OF SUITE 820 (MEASURING APPROXIMATELY 2,943 RENTABLE SQUARE FEET), SUITE 1100 (MEASURING APPROXIMATELY 8,841 RENTABLE SQUARE FEET) & SUITE 1200 (MEASURING APPROXIMATELY 8,682 RENTABLE SQUARE FEET), TERM TO BE EXTENDED 60 MONTHS, EXPIRATION DATE TO BE ADJUSTED TO 9/30/2011 - MINIMUM MONTHLY RENT: OCTOBER 1, 2006: FREE RENT; 11/1/2006 - 9/30/2007: $1.40 PER RSF OR $28,652.40 ($343,828.80 PER ANNUM); 10/1/2007 - 9/30/2008: $1.44 PER RSF OR $29,471.04 ($353,652.48 PER ANNUM); 10/1/2008 - 9/30/2009: $1.48 PER RSF OR $30,289.68 ($363,476.16 PER ANNUM); 10/1/2009 - 9/30/2010: $1.52 PER RSF OR $31,108.32 ($373,299.84 PER ANNUM)