https://staatsbibliothek-berlin.de/en/ The entire buildiung is being refurbished, sooner or later, at present all is in a status of being praperd for renovation, in German it sounds serious: “Grundinstandsetzung” will only start in 2023, let alone when works will end, deifinitely not before 2025!
https://www.bbr.bund.de/BBR/DE/Bauprojekte/Berlin/Kultur/Staatsbibliothek/Potsdamerstr/GIS/Grundinstandsetzung.html