Prospectus excerpt:  We are offering 6,000,000 6.000% Series A Cumulative Redeemable Preferred Shares of Beneficial Interest, par value $0.01 per share, which we refer to in this prospectus supplement as the series A preferred shares. We will pay cumulative dividends on the series A preferred shares from the date of original issue at a rate of 6.000% per annum of the $25.00 liquidation preference per share (equivalent to an annual rate of $1.50 per share). Dividends on the series A preferred shares will be payable quarterly in arrears on or about the last day of March, June, September and December of each year, beginning December 31, 2017. The series A preferred shares will rank senior to our common shares of beneficial interest, par value $0.01 per share, or our common shares, with respect to dividend rights and rights upon our liquidation, dissolution or winding up.