I would assume the obvious solution in France would be to take out a loan of 50-80% of the property price, instead of selling it + paying the taxes. Mortgage in

I would assume the obvious solution in France would be to take out a loan of 50-80% of the property price, instead of selling it + paying the taxes. Mortgage interest rates are relatively low, and you can use that money to reinvest. Every country has its tax quirks but also usually has a solution for it. Deferring taxes is generally a lot easier than avoiding them.