How should one imagine this textually? Are 3 house types (brick, modern, Bauhaus) described or defined in the development plan?
There is a) a development plan. b) The design framework was determined by the Klosterkammer (heritable leasehold properties). It is subdivided into three areas: traditional style, modern style, and Bauhaus style. The new development area is thus divided: in the south along a street layout the traditional bungalows (red brick, up to 1/3 other facade details allowed), in the middle the modern style as single-storey with all roof pitches, height up to 7.80, at least 2/3 white plaster, the rest of the facade may have other details, in the north the 1-2-storey Bauhaus houses, also 2/3 white, the rest can have other details.
In the development plan, actually everything single-storey is allowed. For the Bauhaus houses the single-storey requirement was relaxed.
Regarding the rest of the design: over the years everything is seen more and more flexibly.