For architects (this is the case) it may have a dual mission:
On the one hand, certify, in the design process, the viability of a given solution. On the other hand, it is a powerful tool to convey the customer how it could be his project. I mean : “render architecture helps Architecture”.
Otherwise, it may be useful to argue in instances related to the Heritage, viability or the no of the proposal.
This time, the project was the extension in height of an existing building. The façade should be maintained on the ground, first and second floor.
The ordinances allowed height growth up three floors.