How strictly must developers adhere to the site plan?

The yellow above is the wall

Aha

The street is therefore also narrower

Where is the street?

Because of that, there is also no longer the drawn-in flower bed and trash can space. Now it is more like this

I see both flower bed and trash can..

Now it is more like this

Blue? And now?

Yes, the site plan that was submitted

You can see little (even if zoomed in) and recognize nothing – except that the illustration lets the experienced reader suspect that it might be a project of one of the usual condominium suspects. Who submits a site plan to whom and what could we recognize if you had understood the manual of your smartphone?

What does your purchase contract say?

I always say the language of the planner is the plan.

Yours unfortunately is not. I don't understand a thing.

Has the plan become part of the contract?

What is contractually regulated? The "demolition" in the site plan does not indicate who has to demolish ...