By Natalie Rodriguez (February 18, 2015, 2:33 PM EST) -- Following on the heels of its recently closed $1.95 billion purchase of the Waldorf-Astoria New York, China's Anbang Insurance Group Co. is reportedly purchasing a Fifth Avenue office tower from Blackstone Group LP, according to a Crain's report, which cited unnamed sources. A price tag was not placed on the deal for the 26-story tower at 717 Fifth Avenue, but Crain's noted that a similarly sized building nearby recently sold for $1.75 billion. The Blackstone-backed Hilton Worldwide Holdings Inc. closed on the Waldorf-Astoria sale and subsequent 100-year management agreement with Anbang earlier this month after the deal cleared a review from the Committee on Foreign Investment in the U.S....