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Fair Value of Assets and Liabilities
9 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities
 
As of September 30, 2019, we do not have any assets or liabilities measured at fair value.

Financial Instruments

Our financial instruments include our cash and cash equivalents, restricted cash, marketable securities, senior unsecured debt and mortgage note payable.  At September 30, 2019 and December 31, 2018, the fair value of these additional financial instruments were not materially different from their carrying values, except as follows (in thousands):
September 30, 2019December 31, 2018
Principal BalanceFair ValuePrincipal BalanceFair Value
Senior unsecured debt and mortgage note payable
$25,579  $26,321  $276,000  $283,214  
 
The fair values of our senior notes are based on quoted market prices (level 2 inputs), and the fair value of our mortgage note payable is based on estimates using discounted cash flow analyses and currently prevailing interest rates adjusted by credit risk spreads (level 3 inputs).
Other financial instruments that potentially subject us to concentrations of credit risk consist principally of rents receivable. As of September 30, 2019, we have one tenant that is responsible for 23.0% of our total annualized rents, and no other single tenant of ours is responsible for more than 10.0% of our total annualized rents.