	September 30, 2011	December 31, 2010
5.73% mortgage note, secured by one commercial property with a net book value of $28.1 million, principal and interest payable monthly, due March, 2013	$ 13,511	$ 13,729
6.15% mortgage note, secured by one commercial property with a net book value of $25.7 million, principal and interest payable monthly, repaid October, 2011 ⁽¹⁾	15,559	15,950
5.52% mortgage note, secured by one commercial property with a net book value of $15.2 million, principal and interest payable monthly, due May, 2013	9,378	9,572
5.68% mortgage note, secured by one commercial property with a net book value of $16.9 million, principal and interest payable monthly, due May, 2013	9,402	9,594
5.61% mortgage note, repaid January, 2011⁽²⁾	—	2,666
Total	$ 47,850	$ 51,511

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⁽¹⁾ The mortgage note has a stated principal balance of $15.5 million and a stated interest rate of 7.20%. Based on the fair market value at the time of assumption, a mortgage premium was computed based on an effective interest rate of 6.15%. The unamortized premiums were $39,000 and $209,000 as of September 30, 2011 and December 31, 2010, respectively.

⁽²⁾ The unamortized premium was $6,000 as of December 31, 2010.