Kim Jong Un can secretly deploy agents with bombs in the US and threat to explode buildings owned by Trump. I don't think Trump will risk all his wealth in favor of political ambitions.
Did you think north Korean will be able to attack a building in American even if trump is sleeping? We know that trump has many buildings in usa and international but Kim don't have that capacity you are attributed to him. The highest he can do is attacking American allies who are living at north Korean border.