Key legal question
Whether the annex to the protected Jugendstil villa complied with the positive aesthetic clause and integration requirement under planning law.
Extracted holding
The annex did not integrate satisfactorily with the protected villa; the authority could require a visually distinct, architecturally separated extension.
Extracted reasoning
The court held that the positive aesthetic clause requires a befriedigende Einordnung, assessed objectively from the average observer's perspective and with regard to the existing structure. Here the project would merge the historic villa into a mixed building, disrupting its form, proportions, and protected character.