The article concerns the possibility of applying the July 20th 2018 Act on the transformation of perpetual usufruct rights (leasehold use of real-estate properties erected on lands owned by the State Treasury for housing purposes) into ownership rights to said lands – and also, contrary to the title of that Act, undeveloped lands, i.e. not built upon. The author points to and discusses three possibilities for its application. However, these options remain available only to entities that were in a position to carry out legal research and take appropriate steps before 2019, or have a unique type of mixed real-estate.