5. Mortgage Notes Payable and Line of Credit

Our mortgage notes payable and line of credit as of September 30, 2013 and December 31, 2012 are summarized below (dollars in thousands):

Mortgage Notes Payable

As of September 30, 2013, we had 34 fixed-rate mortgage notes payable, collateralized by a total of 68 properties. Gladstone Commercial Corporation has limited recourse liabilities that could result from any one or more of the following circumstances: a borrower voluntarily filing for bankruptcy, improper conveyance of a property, fraud or material misrepresentation, misapplication or misappropriation of rents, security deposits, insurance proceeds or condemnation proceeds, or physical waste or damage to the property resulting from a borrower’s gross negligence or willful misconduct. We will also indemnify lenders against claims resulting from the presence of hazardous substances or activity involving hazardous substances in violation of environmental laws on a property. The weighted-average interest rate on the mortgage notes payable as of September 30, 2013 was 5.5%.

During the nine months ended September 30, 2013, we issued four long-term mortgages, which are summarized below (dollars in thousands):

The fair value of all fixed-rate mortgage notes payable outstanding as of September 30, 2013, was $409.8 million, as compared to the carrying value stated above of $409.0 million. The fair value is calculated based on a discounted cash flow analysis, using interest rates based on management’s estimate of market interest rates on long-term debt with comparable terms. The fair value was calculated using Level 3 inputs of the hierarchy established by ASC 820, “Fair Value Measurements and Disclosures.”

Scheduled principal payments of mortgage notes payable for the remainder of 2013 and each of the five succeeding fiscal years and thereafter are as follows (in thousands):

Line of Credit

In August 2013, we procured a new $60.0 million senior unsecured revolving credit facility, or the New Line of Credit, with Keybank National Association serving as a revolving lender, a letter of credit issuer and an administrative agent and Citizens Bank of Pennsylvania as an additional lender. The New Line of Credit initially matures in August 2016; however, we have a one-year extension option subject to the payment of an extension fee equal to 25 basis points on the initial maturity date and certain other customary conditions. The New Line of Credit replaced the Credit Agreement, dated as of December 28, 2010 with Capital One, N.A., as administrative agent, and the other lenders party thereto, or the Prior Line of Credit. The Prior Line of Credit provided for a senior secured revolving credit facility in the amount of $75.0 million and was originally scheduled to mature on December 28, 2013.

The New Line of Credit has a letter of credit sublimit of up to $20.0 million. In addition, we may expand the New Line of Credit up to a total of $75.0 million upon satisfaction of certain conditions, including obtaining commitments from any one or more lenders, whether or not currently a party to the New Line of Credit, to provide such increased amounts and payment of the associated up front and arrangement fees at the time of such increase. The interest rate per annum applicable to the New Line of Credit is equal to the London Interbank Offered Rate, or LIBOR, plus an applicable margin of up to 3.25%, depending upon our leverage. The leverage ratio used in determining the applicable margin for interest on the New Line of Credit is recalculated quarterly. We are subject to an annual maintenance fee of $0.03 million per year and an unused commitment fee of 25 basis points per year, which accrues quarterly. Our ability to access this source of financing is subject to our continued ability to meet customary lending requirements, such as compliance with financial and operating covenants and our meeting certain lending limits. One such covenant requires us to limit distributions to our stockholders to 100% of our FFO, with acquisition-related costs required to be expensed under ASC 805 added back to FFO. In addition, the maximum amount we may draw under the New Line of Credit is based on a percentage of the value of a pool of unencumbered properties which must meet agreed upon eligibility standards.

If and when long-term mortgages are arranged for properties in the unencumbered pool, the banks will reduce the availability under the New Line of Credit by the amount advanced against that property’s value. Conversely, as we purchase new properties meeting the eligibility standards, we may add these new properties to the unencumbered pool to obtain additional availability under the New Line of Credit. The availability under the New Line of Credit is also reduced by letters of credit used in the ordinary course of business. We may use the advances under the New Line of Credit for both general corporate purposes and the acquisition of new investments.

As of September 30, 2013, there was $28.9 million outstanding under our New Line of Credit at an interest rate of approximately 3.2% and $6.4 million outstanding under letters of credit at a weighted average interest rate of 3.0%. As of September 30, 2013, the maximum additional amount we could draw was $16.2 million. We were in compliance with all covenants under the New Line of Credit as of September 30, 2013. The amount outstanding on the New Line of Credit as of September 30, 2013 approximates fair value, because the debt is short-term.