Yes, Trump is having undue business influence in foreign countries based on his election because he can order certain countries to allow his buildings now that he is president. He can negatively impact any country that does not agree with him. He is using the presidency as a way to make money.
While it might not be on purpose the status of the presidency could possibly give him the edge in his business dealings and he may be able to use it to make things happen for his company. Whether or not there is true conflict of interest is up for debate.
Being president of the United States of America brings on a great deal of power and influence. Nobody can say that the POTUS doesn't have a certain amount of pull, and can certainly stand to benefit personally from the job. Donald Trump is just the kind of man that would take full advantage of this power for his own personal gain. There is no doubt in my mind that something like this is in play with this particular project.
Trump is still a skilled businessman that knows how to make things happen, regardless of the election. Likely, his assets will be placed in a blind trust while he is President. He will not have any oversight or decision making over those assets. This will protect him from the appearance of impropriety.