The paper deals with the analysis of the procedure of linking the land register and the book of deposited contracts. The land register refers to the public register in which real estate and legal real estate are entered, and it is the only such record that is relevant in legal transactions. The paper explains the basic function of land registers, which is reflected in the fact that everyone believes that the content contained in the land registers is complete and true. In addition to the land register, in the land law system of the Republic of Croatia there is also a book of deposited contracts, in which individual dwellings were entered regardless of whether the building in which a particular dwelling was located was entered in the land register or not. The book of deposited contracts consists of the main register and the collection of documents and is kept separately for each cadastral municipality. The final paper analyzes the Regulations on linking the land register and the book of deposited contracts and the registration of ownership of a special part of real estate in the Republic of Croatia. The analysis explains the basic purposes of the Regulations, which referred to enabling automatic merging of entries in the general land register with existing entries in the book of deposited contracts and the complete determination of cadastral parcels on which there are objects with several special parts.