Short update, a salesperson from a not unknown prefabricated house provider contacted me again, apparently wants to keep me on the hook (I had conversations not only with Town & Country). Usual stuff, building is always getting more expensive, now or never etc. - of course. But explicitly, he also addressed the topic of property transfer tax. He said he had already had over 100 houses built (Hessen), and in most of them the land was acquired by third parties but through their mediation - basically tied deals, as I have read here several times. And NEVER was property transfer tax paid on more than the land. He referred explicitly to Hessen, in Bavaria it is different, for example. Are there people among the valued forum participants who can clearly confirm or refute this? Thanks