"The FBI memo first surfaced 20 years ago in response to a Freedom of Information Act (FOIA) request filed by the website The Smoking Gun. "
"The four-page memo, written by Damon T. Taylor, an FBI special agent who worked organized crime cases out of the New York field office, describes how Trump first approached the FBI in April 1981 to “to express his reservations” about building a casino in Atlantic City."
I found the pdf on another site from the one linked below. File was trump-docs.pdf which doesn't help.
This buzzfeed article provides the quotes above and has the four source pages allegedly provided in the initial FOIA application.
https://www.buzzfeednews.com/article/jasonaleopold/trumps-long-history-with-the-fbi-in-1981-he-offered-to-fully
Happy flower dog provided for no real reason.