The principle of mortgage extensiveness with regard to buildings and separate parts of immovable property under construction

In accordance with the principle of legal unity of immovable property, immovable property consists of parcels of land and everything permanently connected to it, whether on the surface or underground. The reform of the system of real property law in the Republic of Srpska established the legal unity of immovable property between land, building, and separate parts of immovable property, making the owners of separate parts of immovable property (co)owners of the entire immovable property (land and building). Immovable property, which is identified with land, is the object of property rights and the object of a mortgage. In accordance with the principle of extensiveness, a mortgage exists with respect to immovable property as a whole, which means that a mortgage constituted on a land also covers the building as well as the separate part of the immovable property (apartment, business space, garage, etc.). Acquisition of property rights and acquisition of a mortgage on immovable property as a whole is possible on the basis of the principle of reliance, which takes precedence over the principle of Nemo plus iuris ad alium transferre potest quam ipse habet. When it comes to buildings and separate parts of immovable property under construction, the application of the principle of mortgage extensiveness or the principle of reliance depends on the moment the property rights or a mortgage are acquired. The principle of mortgage extensiveness takes precedence if the owner of the land managed to register the mortgage before the sale of the building or separate part under construction, and vice versa, the principle of reliance takes precedence if a conscientious buyer of an apartment in a building under construction managed to register ownership before the mortgage was constituted on the land.