dispositions are intended to be used for the repayment of debt, repurchases of our common stock, any special dividends required to meet REIT requirements, and other general corporate purposes.
For the year ended December 31, 2021, our disposition strategy resulted in gross sale proceeds of approximately $603 million, and we repaid approximately $508 million of debt. Specifically, on May 27, 2021, we sold One Ravinia, Two Ravinia and One Overton Park in Atlanta, Georgia for aggregate gross proceeds of approximately $219.5 million, on June 29, 2021, we sold Loudoun Technology Center in Sterling, Virginia for gross proceeds of approximately $17.25 million, on August 31, 2021, we sold River Crossing in Indianapolis, Indiana for gross proceeds of $35 million, on September 23, 2021, we sold Timberlake and Timberlake East, in Chesterfield, Missouri for aggregate gross proceeds of $67 million, on October 22, 2021, we sold 999 Peachtree in Atlanta, Georgia for gross proceeds of approximately $223.9 million and on November 16, 2021, we sold two office properties in Chantilly, Virginia for aggregate gross proceeds of approximately $40 million. During the three months ended June 30, 2021, we repaid approximately $155 million of term loan indebtedness and the approximately $47.5 million that had been drawn under our revolving line of credit. During the three months ended September 30, 2021 and December 31, 2021, we repaid $90 million and $215 million, respectively, of term loan indebtedness. During the three months ended March 31, 2022, we did not have any property dispositions and, as a result, did not repay any indebtedness.
On June 15, 2021, the credit rating for our senior unsecured debt was downgraded by Moody’s Investor Service to Ba1 from Baa3. The interest rate applicable to borrowings under our credit facilities is based in part on the rating of our debt. We anticipate that as a result of this downgrade we will incur approximately $2.2 million in additional interest costs during the next twelve months based on our borrowings and interest rates as defined in our loan agreements as of March 31, 2022.
Trends and Uncertainties
COVID-19 Outbreak
Beginning in January 2020, there was a global outbreak of COVID-19, which continues to adversely impact global commercial activity and has contributed to significant volatility in financial markets. It has already disrupted global travel supply chains, adversely impacted global commercial activity, and its long-term economic impact remains uncertain. Considerable uncertainty still surrounds the COVID-19 pandemic and its potential effects on the population, including the spread of more contagious variants of the virus, as well as the availability, administration rates and effectiveness of vaccines, therapeutics and any responses taken on a national and local level by government authorities and businesses. The travel restrictions, limits on hours of operations and/or closures of various businesses and other efforts to curb the spread of COVID-19 significantly disrupted business activity globally, including in the markets where we own properties. Many of our tenants do not fully occupy the space that they lease. The pandemic has had an adverse impact on economic and market conditions in various sectors of the economy. However, the evolving nature of the pandemic makes it difficult to ascertain the long-term impact it will have on commercial real estate markets and our business. Nevertheless, the COVID-19 pandemic continues to present material uncertainty and risk with respect to the performance of our properties and our financial results, such as the potential negative impact to the businesses of our tenants, the potential negative impact to leasing efforts and occupancy at our properties, the potential closure of certain of our assets for an extended period, uncertainty regarding future rent collection levels or requests for rent concessions from our tenants, the occurrence of a default under any of our debt agreements, the potential for increased borrowing costs, our ability to refinance existing indebtedness or to secure new sources of capital on favorable terms, fluctuations in our level of dividends, increased costs of operations, our ability to complete required capital expenditures in a timely manner and on budget, decrease in values of our real estate assets, changes in law and/or regulation, and uncertainty regarding government and regulatory policy. We are unable to estimate the impact the COVID-19 pandemic will have on our future financial results at this time. See Part I, Item 1A. “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2021.
We have been following and directing our vendors to follow the guidelines from the Centers for Disease Control and other applicable authorities to minimize the spread of COVID-19 among our employees, tenants, vendors and visitors, as well as at our properties. During the year ended December 31, 2021 and the three months ended March 31, 2022, all of our properties remained open for business. Some of our tenants have requested rent concessions, and more tenants may request rent concessions or may not pay rent in the future. Future rent concession requests or nonpayment of rent could lead to increased rent delinquencies and/or defaults under leases, a lower demand for rentable space leading to increased concessions or lower