Construction costs for property tax calculation - What must be specified?

I called the office once... she said it wouldn’t come down to 10k at all, it’s only about seeing whether it’s a "normal" house or an over-the-top villa... They don’t want invoices or anything like that either. What they want is the Wohnraumberechnung, which I’m supposed to include. That’s fine too. I’ll do it like Hemali then, and just list the things.