vertex pharmaceuticals incorporated notes to consolidated financial statements ( continued ) k . commitments ( continued ) at december 31 , 2006 , future minimum commitments under facility operating leases with non-cancelable terms of more than one year ( including commitments under the kendall square lease ) are as follows ( in thousands ) : rental expense for 2006 was $ 26.7 million , which included $ 9.5 million related to the kendall square facility . rental expense for 2005 was $ 20.4 million , which included $ 4.7 million related to the space in the kendall square facility that the company occupied in 2006 in the kendall square facility . for 2004 , rental expense primarily related to facilities , excluding the kendall square facility , was $ 16.3 million . the company has future contractual commitments in connection with its research and development programs . for 2007 and 2008 the amount committed under these contracts is $ 1.1 million and $ 0.6 million , respectively . l . convertible subordinated notes on february 13 , 2004 , the company issued approximately $ 153.1 million in aggregate principal amount of 5.75% ( 5.75 % ) convertible senior subordinated notes due in february 2011 ( the 201cfebruary 2011 notes 201d ) in exchange for an equal principal amount of its outstanding 5% ( 5 % ) convertible subordinated notes due in september 2007 ( the 201c2007 notes 201d ) . on september 17 , 2004 , the company issued approximately $ 79.3 million in aggregate principal amount of 5.75% ( 5.75 % ) convertible senior subordinated notes due in february 2011 ( the 201cseptember 2011 notes 201d ) in exchange for an equal principal amount of its 2007 notes . the terms of the september 2011 notes are identical to those of the february 2011 notes ( the february 2011 notes and the september 2011 notes are referred to together as the 201c2011 notes 201d ) . the 2011 notes are convertible , at the option of the holder , into common stock at a price equal to $ 14.94 per share , subject to adjustment under certain circumstances . the 2011 notes bear interest at the rate of 5.75% ( 5.75 % ) per annum , and the company is required to make semi-annual interest payments on the outstanding principal balance of the 2011 notes on february 15 and august 15 of each year . on or after february 15 , 2007 , the company may redeem the 2011 notes at a redemption price equal to the principal amount plus accrued and unpaid interest , if any . the deferred issuance costs associated with the issuance of the 2011 notes , which are classified as long-term other assets , were approximately $ 3.0 million for the february 2011 notes and $ 1.9 million for the september 2011 notes . the 2007 notes are convertible , at the option of the holder , into common stock at a price equal to $ 92.26 per share , subject to adjustment under certain circumstances . the 2007 notes bear interest at the rate of 5% ( 5 % ) per annum , and the company is required to make semi-annual interest payments on the outstanding principal balance of the 2007 notes on march 19 and september 19 of each year . the 2007 notes are redeemable by the company at any time at specific redemption prices if the closing price of the kendall square sublease income for kendall square facility other operating leases total operating leases $ 22718 $ ( 8156 ) $ 17290 $ 31852 23621 ( 8156 ) 16638 32103 23683 ( 8156 ) 12345 27872 23748 ( 8156 ) 11307 26899 23816 ( 4466 ) 684 20034 thereafter 171237 ( 1747 ) 246 169736 total minimum lease payments $ 288823 $ ( 38837 ) $ 58510 $ 308496 .
what percent of the total operating leases in 2007 are not related to the kendall square lease?
vertex pharmaceuticals incorporated notes to consolidated financial statements ( continued ) k . commitments ( continued ) at december 31 , 2006 , future minimum commitments under facility operating leases with non-cancelable terms of more than one year ( including commitments under the kendall square lease ) are as follows ( in thousands ) : rental expense for 2006 was $ 26.7 million , which included $ 9.5 million related to the kendall square facility . rental expense for 2005 was $ 20.4 million , which included $ 4.7 million related to the space in the kendall square facility that the company occupied in 2006 in the kendall square facility . for 2004 , rental expense primarily related to facilities , excluding the kendall square facility , was $ 16.3 million . the company has future contractual commitments in connection with its research and development programs . for 2007 and 2008 the amount committed under these contracts is $ 1.1 million and $ 0.6 million , respectively . l . convertible subordinated notes on february 13 , 2004 , the company issued approximately $ 153.1 million in aggregate principal amount of 5.75% ( 5.75 % ) convertible senior subordinated notes due in february 2011 ( the 201cfebruary 2011 notes 201d ) in exchange for an equal principal amount of its outstanding 5% ( 5 % ) convertible subordinated notes due in september 2007 ( the 201c2007 notes 201d ) . on september 17 , 2004 , the company issued approximately $ 79.3 million in aggregate principal amount of 5.75% ( 5.75 % ) convertible senior subordinated notes due in february 2011 ( the 201cseptember 2011 notes 201d ) in exchange for an equal principal amount of its 2007 notes . the terms of the september 2011 notes are identical to those of the february 2011 notes ( the february 2011 notes and the september 2011 notes are referred to together as the 201c2011 notes 201d ) . the 2011 notes are convertible , at the option of the holder , into common stock at a price equal to $ 14.94 per share , subject to adjustment under certain circumstances . the 2011 notes bear interest at the rate of 5.75% ( 5.75 % ) per annum , and the company is required to make semi-annual interest payments on the outstanding principal balance of the 2011 notes on february 15 and august 15 of each year . on or after february 15 , 2007 , the company may redeem the 2011 notes at a redemption price equal to the principal amount plus accrued and unpaid interest , if any . the deferred issuance costs associated with the issuance of the 2011 notes , which are classified as long-term other assets , were approximately $ 3.0 million for the february 2011 notes and $ 1.9 million for the september 2011 notes . the 2007 notes are convertible , at the option of the holder , into common stock at a price equal to $ 92.26 per share , subject to adjustment under certain circumstances . the 2007 notes bear interest at the rate of 5% ( 5 % ) per annum , and the company is required to make semi-annual interest payments on the outstanding principal balance of the 2007 notes on march 19 and september 19 of each year . the 2007 notes are redeemable by the company at any time at specific redemption prices if the closing price of the kendall square sublease income for kendall square facility other operating leases total operating leases $ 22718 $ ( 8156 ) $ 17290 $ 31852 23621 ( 8156 ) 16638 32103 23683 ( 8156 ) 12345 27872 23748 ( 8156 ) 11307 26899 23816 ( 4466 ) 684 20034 thereafter 171237 ( 1747 ) 246 169736 total minimum lease payments $ 288823 $ ( 38837 ) $ 58510 $ 308496 .