1. Introduction. – 2. Methodological Research Framework. – 3. Registration of Data in the State Registration System of Real Estate - Cadastre of Real Estate. – 4. Challenging Legal Aspects of Real Estate Registration in the Slovakian Land Registry (Cadastre) under National Law. – 5. Challenging Legal Aspects of Real Estate Registration in the Slovakian Land Registry (Cadastre) under European Union Law. – 6. Challenges in Practice: Notarial Decision-Making and Property Registration in Slovakia. – 7. Concluding Remarks.