When deciding on the sale of housing for which a tenancy right exists (NN 27/91), it is envisaged the establishment of the Book of Agreements as a temporary decision to acquire the right of ownership in occupied housing where buildings have never been entered in land registers. By adopting the Land Registry Act in 1996, it is foreseen to merge the book of contracts and land registers, in order to establish a unique property rights regime. Namely, apart from the land registers, which represent basic records of the legal status of real property for real estate transactions in the Republic of Croatia, the land registry courts for certain cadastral municipalities also keep records of the book of contracted contracts established for the purpose of enrolling property rights on apartments purchased under the Law on Sell flats where occupancy right exists. The founding of a contracted book, along with an already established land register in which the land on which buildings were built, whose separate parts (flats) were purchased, was possible considering that the building built on socially owned land was considered a special property. With the entry into force of the Law on Ownership and Other Real Rights and the Land Registry Act, legal unity of land and buildings (real estate) and special parts of the building was established, and thereafter it is no longer possible to keep a book of contracts placed for the purpose of entering ownership of a special part of the building. The book of contracted contracts has become an integral part of the land registry, and the inscriptions refer to the coownership of the entire property belonging to the individual owner whose co-ownership is related to the ownership of a special part of the property. The Ordinance on the Linking of the Land Register and the Book of Agreed Placements and the Registration of Ownership of a Special Real Estate Part (NN 121/2013) entered into force on September 30, 2013, provides for the procedure of linking the land register and the book of the contracts entered into by entering the building Particles and all its special parts, all for the purpose of obtaining the finishing of the land-book condition. By entering into the Land Register and the Book of Agreed Transactions, the Land Registry will provide accurate information on all the specific parts of the buildings (apartments, business premises, garages, etc.), then their owners, surfaces, and shareholdings, The real owners / co-owners of the building will be entered on the plot.