In my opinion, this is at least a classic architect/GC service in the upper segment. If I hadn’t built with a developer, I would have used them just the same. After all, not everyone has the time or desire to constantly hang around a construction site. The architect will then make decisions in individual cases if something is unclear on the construction. In the commercial sector, construction is only done this way, since not every company employs its own site manager. And ventilation, etc., will certainly not be handled by the architect, but by the site management. It’s no different with a developer. Of course, you have to pay for this service in the end.