Expected Ratings*

    (Moody’s/S&P/Fitch):

A “Change of Control” means the following events have occurred and are continuing:

•    the acquisition by any “person” or “group” (within the meaning of Section 13 (d)(3) of the Securities Exchange Act of 1934, as amended) of beneficial ownership, directly or indirectly, through a purchase, merger or other acquisition transactions or series of purchases, mergers or other acquisition transactions of shares of the Issuer entitling that person or group to exercise more than 50% of the total voting power of all shares of the Issuer entitled to vote generally in elections of trustees (except that such person or group will be deemed to have beneficial ownership of all securities that such person or group has the right to acquire, whether such right is currently exercisable or is exercisable only upon the passage of time or occurrence of a subsequent condition); and

•    following the closing of any transaction referred to in the above bullet, neither the Issuer nor the acquiring or surviving entity has a class of common securities (or American Depositary Receipts representing such securities) listed on the New York Stock Exchange (the “NYSE”), the NYSE MKT or the NASDAQ Stock Market (“NASDAQ”) or listed or quoted on an exchange or quotation system that is a successor to the NYSE, the NYSE MKT or NASDAQ.

Upon the occurrence of a Change of Control, each holder of Series G Preferred Shares will have the right, unless, prior to the Change of Control Conversion Date, the Issuer has timely provided notice of its exercise of its redemption rights with respect to the Series G Preferred Shares (whether pursuant to the Issuer’s optional redemption right or its special optional redemption right), to convert some or all of the Series G Preferred Shares held by such holder on the Change of Control Conversion Date into a number of the Issuer’s common shares per Series G Preferred Share to be converted equal to the lesser of:

•    the quotient obtained by dividing (1) the sum of the $25.00 liquidation preference plus the amount of any accumulated and unpaid dividends to, but not including the Change of Control Conversion Date (unless the Change of Control Conversion Date is after a record date for a Series G Preferred Share dividend payment and prior to the corresponding Series G Preferred Share dividend payment date, in which case no additional amount for such accumulated and unpaid dividend will be included in this sum) by (2) the Common Share Price (as defined below); and

•    0.7389 (the “Share Cap”), subject to certain adjustments;

subject, in each case, to an aggregate cap on the total number of common shares issuable upon exercise of the change of control conversion right and to provisions for the receipt of alternative consideration as described under “Description of the Series G Preferred Shares—Conversion Rights” in the Preliminary Prospectus Supplement.

If the Issuer has timely provided a redemption notice (whether pursuant to the Issuer’s optional redemption right or its special optional redemption right) in connection with a Change of Control, holders of Series G Preferred Shares will not have any right to convert their Series G Preferred Shares in connection with the Change of Control Conversion Right, and any Series G Preferred Shares subsequently selected for redemption that have been tendered for conversion will be redeemed on the related redemption date instead of converted on the Change of Control Conversion Date.

The “Change of Control Conversion Date” is the date the Series G Preferred Shares are to be converted, which will be a business day selected by the Issuer that is no fewer than 20 days nor more than 35 days after the date on which the Issuer provides the required notice of the occurrence of a Change of Control to the holders of Series G Preferred Shares.

The “Common Share Price” will be (1) the amount of cash consideration per common share, if the consideration to be received in the Change of Control by holders of the Issuer’s common shares is solely cash; and (2) the average of the closing prices for the Issuer’s common shares on the NYSE for the 10 consecutive trading days immediately preceding, but not including, the effective date of the Change of Control, if the consideration to be received in the Change of Control by holders of the Issuer’s common shares is other than solely cash. The last reported sale price of the Issuer’s common shares on the NYSE on November 17, 2017 was $67.67 per share.

Merrill Lynch, Pierce, Fenner & Smith

                     Incorporated

RBC Capital Markets, LLC

Stifel, Nicolaus & Company, Incorporated

Raymond James & Associates, Inc.

B. Riley FBR, Inc.

Janney Montgomery Scott LLC

Ladenburg Thalmann & Co. Inc.