Bernie has only 3 homes. They are nice upper middle class homes, but not mansions. His money comes from a mix of salary, pensions, real estate investments, sales from 3 best-selling books and some inheritance. Plus, his wife had high-paying jobs. A 2019 article at Forbes gives Bernie's total wealth (including home values) as $2.5 million. Remember, he and his wife have been working for at least 50 years to amass that level of wealth.
It will not be dealt with, and this "empire" will fall. Bigger and stronger have fallen, but it took hundreds of years, even thousands, but this country has only taken 248 years.