Isn't that a new development area somewhere near St. Peter-Ording or Garding?
I rather suspect that the city has designated the area as a single-family home development and wants to allocate it relatively cheaply to locals so that people stay up there and can create ownership.
Then someone comes along who wants to swindle such a cheap plot. Swindle, because you intend to acquire it abusively and apparently just want to build some holiday apartments there to rent out. Presumably, holiday apartments are not that much of a problem where you are, but housing for locals is. Therefore, I suspect that the city will resist quite a bit here and try to sabotage your plans.
Either you now have nerves of steel, buy the land, and push ahead at all costs. Or you get the land on the free, non-subsidized market. Or is the return too low for you then because others had the same idea and the land is therefore too expensive? See! Many homebuilders have this dilemma as well, and the city probably wants to help exactly those with the new development area—and not maximize your investor return! So just expect zero accommodation from the city; anything else is naive.