Which neighborhood do you think he will buy in? Georgetown is the obvious choice, or maybe something closer near the Facebook office in Chinatown?
More likely, he's looking for a place where he serve as power broker, king maker, and socialize with other oligarchs, heads of state, etc.
Kalorama puts him on equal footing with Bezos. Half the Trump clan already has homes there. Obama is there. And a bunch of other millionaires and billionaires most of us have never heard of.