In connection with the introduction of NACE Rev. 2 into the FDI statistics, the publication includes data on real estate owned by non-resident natural persons. The administrative source for the stock calculation is the Cadastre Information System (ISKN), which contains the number, ownership interests and area of individual sites, buildings (i.e. dwelling houses and family houses) and units (apartments) of natural persons having permanent residence abroad. The ISKN does not register the citizenship of property holders. The administrative data on buildings and units obtained in this way were assessed at market value.