The 1st Conference of Interdisciplinary Research on Real Estate CIRRE 2016 was held on the 15th and 16th of September in Ljubljana Slovenia. The conference was organized as part of the 10th anniversary of the Faculty of Law in Ljubljana. Participants were researchers from more than thirteen countries along with about sixty contributions. The 2st CIRRE 2017 in Cartagena Spain was my first introduction by participating in the conference with a number of papers and PhD students from my then lectureship in Real Estate at the Hanze University of Applied Sciences in Groningen. When I asked where the CIRRE congress wanted to be organized in 2018, I got the question back: why not in Groningen? And so it happened that in 2018 the CIRRE congress was held in Groningen by Hanze University of Applied Sciences, The Netherlands with approximately 100 scientists. This was followed by the 4th CIRRE 2019 held in Trondheim, Norway. Participants were researchers from twelve countries. For the 2020 congress, the intended location was Saxion University of Applied Sciences, Enschede, The Netherlands but due to the pandemic, we pushed it to 2021. Also in 2021 the pandemic was not (yet) over and we decided to have this congress entirely digitally. Many research papers were presented, commented on and improved over a two-day period. From all these submissions, I made a selection of the best potential papers for this book. After two peer reviews, the papers were resubmitted with the attached result of seven chapters.