UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Maryland 20-1676382 (I.R.S. Employer Identification Number) 2727 North Harwood Street, Suite 300, Dallas, Texas 75201 (972) 476-1900 (Address of principal executive offices; zip code) (Registrant's telephone number, including area code) Securities registered pursuan ...