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The loss seems surprisingly low, considering the cost of building the thing.

I don't expect this to end up like Brand-Briesen Airfield, or other massive buildings built and quickly sold at bankruptcy, anytime soon.

I would assume that operating loss wouldn't include the initial cost of building. Could be wrong though.

Could be loan repayments are rolled into the loss? Not that I have any particular knowledge.

You don't need to assume, it's confirmed in the very first sentence of the article.