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Mainly real estate. Everything related to real estate, buying, selling, renting, permits, etc. has to go through the town hall, and the town hall is led by the mayor… pretty easy to put 2 and 2 together and deduce that the mayor has insider info about the local market. He frequently gets criticised for owning too much land, land used for large scale agriculture which in turn makes even more passive income… opened up businesses with the money earned which in turn make even more money…
Yeah, salaries don’t match assets. My dad bought himself a brand new Mercedes-AMG G 63 this year (200-300k euros) and the real estate he has acumulated since 2016 is worth well over 1 million euros now. His official salary as mayor is like 3k euros per month when converted from local currency…