Prospectus excerpt:  We are offering 4,000,000 shares of our 5.70% Series I Cumulative Redeemable Preferred Stock, par value $0.01 per share, which we refer to in this prospectus supplement as our series I preferred. We will pay cumulative dividends on our series I preferred in the amount of $1.4250 per share each year, which is equivalent to 5.70% of the $25.00 liquidation preference per share. Dividends on our series I preferred sold in this offering will be payable quarterly in arrears on the 15th day of each of January, April, July and October of each year, commencing October 15, 2021. Our series I preferred is not subject to any sinking fund. Upon liquidation, dissolution or winding up, our series I preferred will rank senior to our common stock, par value $0.01 per share (the “common stock”), with respect to the payment of distributions.