Note:
(a) The letter was dated Nov 13, and Department of Justice released the letter (presumably to the press, because the letter is not found in www.justice.gov) on Nov 14, 2019.
(b) I learn of the letter from a Bloomberg news report also dated that day (Nov 14). That is why the URL of the letter says BNA.com. https://src.bna.com/MQe?_ga=2.53 ... 00541983.1573850629
(c) Bloomberg Industry Group https://en.wikipedia.org/wiki/Bloomberg_Industry_Group
("(formerly known as Bloomberg BNA, The Bureau of National Affairs, Inc and BNA) is an affiliate of Bloomberg LP [which was founded by Michael Bloomberg in 1981 and is based in Manhattan, with LP standing for Limited Partnership] and a source of legal, tax, regulatory, and business information for professionals. It is headquartered in Arlington County, Virginia. The company's CEO is Josh Eastright. The company was founded in 1929 by [newsman] David Lawrence [as Bureau of National Affairs, Inc (BNA) at Washington, DC] and became employee-owned in 1946. When it was acquired by Bloomberg in September 2011, it was the oldest employee-owned company in the United States") (citations omitted)
Street address of headquarters of Bloomberg Industry Group is 1801 S Bell Street Arlington, VA.