This diploma thesis deals with a legal regulation of lease of apartments and the business premises after the recodification of private law. I have divided the thesis into four chapters in which I try to provide a comprehensive view on the legal legislation. I refer to fundamental changes that were connected with the recodification of lease relationship and I also compare this with the previous legal regulation, an Act of 26 February 1964 the Civil Code, and it's subsequent amendments. In this part I also evaluete it's impact on rights and obligations of contractual parties. In the new legislation the legislator paid attention to the legal framework of the lease of an apartment, especially to the lease on business premises. The most signific...