Whether the building owner is required in person or not does seem to be dictated by the wind direction as Seanus suggests... :-) I needed the building owner the first time, but not on subsequent occasions (which surprised me).
I went with the owner of my apartment. I had to: I own my apartment. But they wouldn't let me give myself permission to live in my apartment because I didn't have the notarial deed proving I had legally bought the apartment. I did have a letter from them to me telling me how much property tax I (as the owner of the property) would have to pay for that year but that wasn't good enough for the two ladies. So I asked how long I'd go to prison for for not having a maldunek. They said I wouldn't. I asked what the fine was for not having a maldunek. They said there wasn't was one. I asked if they had malduneks. They refused to answer. I left without a maldunek.