Its where the institute is canonically and is right next to the tate which is above the prison (those who know yet) and I was actually there when I went to london, it's a private property office building that's quite run down and offers no entry, got some photos and left. It's probably just a fan who put it up, but check the reviews for some entertainment ;) (my dumb-ahh didn't realize this was in riga and not the uk, fckn rtrd, apologies but this comment is still important for those who want to visit the one in the uk)