You have just been spoiled until now. A terrace with an open neighbor's plot is really something nice. But unfortunately, in times of increased densification, it is not permanent. We are now blocking the neighbors' view into the nature reserve. Ten years ago, when they built their house, they specially built a nice balcony to enjoy the view. But they were aware from the start that the plot between them and the nature reserve is a building gap. Naturally, they are not thrilled, but they have been much nicer to us than I expected. You as tenants can theoretically move out. I would rather consider relocating the terrace. Isn't there another possibility?