How exactly do you arrive at the height of 11.73m?
Southern height on the bike and footpath 12.01, northern 11.64. The middle of your property is about 1/4 of the way along the route. 12.01-11.64=0.37 0.37/4=0.09 11.64+0.09=11.73
Is a bike and footpath really to be regarded as a planned street?
After all, like the other streets, it also has a street boundary line. But well, that would rather be disadvantageous for you. Maybe the building authority already assumes 12.03 (or even interpolates 12.04). If not, one can argue with atypicality, because this development only affects four properties in the entire building area.