You can also have a look at the StdTranslucent material in our Datasmith Content plugin, which has a Glass material (and other master materials for all your Architecture use !) looking great with both Lumen and the Path Tracer. 
You can find it by enabling the Datasmith Content Plugin, then navigating in your Engine>Plugins>Datasmith Content Content>Materials folder.
Hope this helped !
Cheers,
Antoine