That was probably meant the other way around
Per sqm you calculate with about 2000 EUR, then with you it’s already over 300,000 + additional construction costs and whatever else belongs...
2000 EUR is quite a lot in my opinion. That was actually the most expensive price we heard during our search, and that was from Kampa, but that was also a KfW 40 house, with great insulation, own power generation and feeding-in, etc.
Otherwise, prices of 1300-1500 EUR were usual.
Maybe it’s cheaper in Berlin as well.