So when a Democratic President has a real unfettered Justice Department, Trump is toast. And probably penniless.
It won't take a Democratic President, it only takes law enforcement with the will to pull the trigger. If there is "reasonable suspicion" that the individual or group has been engaged in enriching themselves through fraudulent and criminal activity, said assets may be preemptivlely seized "pending further criminal investigation".
Mueller could order Mar-A-Lago seized right now if he wanted to.
It is no different than a cop looking at a fat wad of cash in a motorist's wallet and confiscating the "guilty dirty money".