The Grundsteuererklärung real estate declaration in Germany, although it took a long time to prepare, does not have good explanations with examples. It took me two weeks to fill out, understand and order the papers.
If you haven’t started filing a real estate declaration yet, do it now. The time is already approaching the middle. The declaration must be submitted by everyone who owns real estate (apartment, house, garage – in whole or in part). Even apartment owners own some land (Grundstück).