Buying an apartment is no longer from a legal perspective a big issue. Properties and the real estate market, however, still have its troubles and legal risks that need to be taken care of and it is better to ask a lawyer for an advice. Especially, if you are buying a not fully built property, or an unfinished apartment, and you have already a reservation contract or a contract for a future contract on your table.
If you want to "do business with the state," you must accept the new rules of the game and communicate the beneficial owner. Notification and registration of the beneficial owner, however, may be executed only by an authorized person, for example attorney-at-law (advokat). But authorized person is also responsible for you in this matter.