Where can I find these design rules?
On your desk? In your mailbox? At your neighbors’?
If you say that everyone received the design framework, why are you asking where to find it?
Apart from that, they should be part of your purchase contract.
Where do these guidelines come from?
Design plans are part of a building concept on a limited area. City planners develop the concept over years based on soil conditions, environmental protection, surroundings, infrastructure, and so on.
Together with architects, the building authority, and the developer, the concept is implemented.
In the Ox project it also seems to be about preserving the park area. Additionally, animal welfare is a topic.
I haven’t read everything, but through your link you get exactly the information you are looking for. All the justifications are there or something like this:
To be honest, I don’t understand why you don’t want to understand that your neighborhood is a community concept.
This is not the first project in Hamburg that stands out because of its structure compared to the surroundings. The aim is to strengthen community through the neighborhoods. The why is not up for discussion here. But now you are someone who wants to put up a 30 sqm small garden house on a tiny lawn strip instead of a little garden shed, and according to the Condominium Act it is not even your property yet.
Just google the Condominium Act!
You certainly also have a homeowners’ meeting every year: why don’t you raise your problem there?
Otherwise: it is what it is: there are house rules, and you follow them. If you don’t like it, you don’t have to buy.