That's not exactly what he did wrong. He may now have to recuse himself from anymore joking around on TV for the DNC.
I know one country where a clown has become a president. Nothing good is happening in this country. Do you want the same here?
The last time you sold your house, did you sell it for its municipal evaluation? And, as an aside, did you try to manipulate the municipal evaluation beforehand in any way? Also, while you owned it, did you try to inflate its value into the stratosphere to obtain more and/or better financing? I'm guessing you didn't. I'm guessing Stewart didn't either. But do tell me if I'm wrong.
Stewart went out of his way to justify the James/Angoran conspiracy on his "comedy" show, saying that what they are charging Trump with is not a victimless crime. To prove that point he started expanding on the concept of overvaluation and went so far as to include the practice of paying taxes only on government valuations on properties that would sell on the market for much more than basic government valuations. He implied that Trump had done this, depriving New Yorkers of tax dollars. Come to find out Lord Stewart had a New York condo that was valued, for tax purposes, 1/9 what he sold it for (sold for almost 9x government evaluation). Presuming Stewart paid taxes only on what the government said it was worth, he underpaid New York taxes by a factor of 9, if calculated according to Stewarts own moral virtue signaling. The buyer of Stewarts condo sold it in turn, for a 25% loss. Arguably, Stewart had overvalued the worth of his condo, and probably included name recognition in the price he was asking. Fine, buyer beware. But Stewart won't allow Trump to say 'banker beware' (which he did) when proposing a value for his own property, to a party, a large commercial banker (Deutch Bank), who would be much more sophisticated in their own valuations than a condo buyer trying to buy real estate from a celebrity. Because of their sophistication, Deutch Bank did not suffer any loss in their business transaction, while Stewart's unsophisticated buyer did. So it appears Stewarts deal had a victim, while Trump's didn't. Finally, Stewart is in the James/Angoran conspiracy jurisdiction. But so far they haven't indicted him for anything.