Item 1A. Risk Factors

**

Through the period covered by this report, there were no material changes to the Risk Factors disclosed under Item 1A: Risk Factors in Part I of our 2014 Annual Report on Form 10-K.

**Item 2. Unregistered Sales of Equity Securities and Use of Proceeds **

During the quarter ended March 31, 2015, we issued 483,154 shares of common stock to five limited partners of the Operating Partnership in exchange for an equal number of units pursuant to the partnership agreement of the Operating Partnership, as follows:

61,000 shares on January 13, 2015, and

422,154 shares on February 4, 2015

In each case, the issuance of the shares of common stock was exempt from registration pursuant to Section 4(a)(2) of the Securities Act of 1933, as amended.

Issuer Purchases of Equity Securities

The following table summarizes repurchases of common stock settled during the three month period ended March 31, 2015:

(1)

Total number of shares purchased represents shares withheld by us and transferred to treasury shares in connection with employee payroll tax withholding upon the vesting of certain restricted stock awards.

(2)

On April 2, 2015, our Board of Directors authorized us to repurchase up to $2.0 billion of our common stock over the next twenty-four months as market conditions warrant. We may repurchase the shares in the open market or in privately negotiated transactions.

**Item 3. Defaults Upon Senior Securities **

Not applicable.

**Item 4. Mine Safety Disclosures **

Not applicable.