https://www.unrealengine.com/en-US/feed/all/AEC
https://unity.com/solutions/architecture-engineering-constru...
The first move happened with Autodesk releasing Stringray and tying it tightly to 3DS Max. Stingray was not super popular (from what I hear) but its business motivations were real -- there was real-time visualization needs in AEC. UE4 and Unity then started to build out in this area.
I haven't actually seen numbers to back up that there is a viable market here, but there is belief there is a market by all involved parties (Autodesk with Stingray, Epic and Unity.)