At this point some of the articles are linked that reported in the case of Nicolas Berggrün Holdings vs. Semjon Contemporary
https://www.semjoncontemporary.com/wp-content/uploads/2021/12/Offener-Brief_Semjon-Contemporary.pdf
https://www.monopol-magazin.de/galerist-semjon-kaempft-gegen-mietkuendigung-durch-berggruen
https://checkpoint.tagesspiegel.de/langmeldung/75z1R67xJZ8LHFB4ob3Fz4