Hello everyone,
here I have to completely agree with Wabe.
As long as one adheres to the legally binding development plan, no consent from a neighbor is required. In this case, no plans are presented to them for signature, nor are they asked for their opinion.
That is exactly what development plans are for. Before they come into effect, they are available for inspection at the municipality/city. During this period, neighbors can raise concerns which may then be taken into consideration.
Once a development plan has become legally binding, neighbors hardly have any chance left. At most, they can ensure that the new neighbor complies with it.
In such a case, the objection or annulment lawsuit of a third party (namely the neighbor) according to §212a Baugesetzbuch (Baugesetzbuch) has no suspensive effect. Nuisette is completely correctly informed about this.