Prospectus excerpt:  We are offering 4,000,000 shares of our 6.50% Series E Cumulative Redeemable Preferred Stock, or the Series E Preferred Stock or the Shares. When, as, and if authorized by our board of directors and declared by us, dividends on the Series E Preferred Stock will be payable quarterly in arrears on or about January 31, April 30, July 31, and October 31 of each year at a rate per annum equal to 6.50% per annum of the $25.00 liquidation preference. Dividends on the Shares are cumulative. The first dividend on the Series E Preferred Stock sold in this offering will be paid on July 31, 2021, will cover the period from, but not including, June 10, 2021 to, but not including, July 31, 2021 and will be in the amount of $0.225694 per share.