City generator based on Blosm addon

Hey all!

I’m doing city generator based on Blosm addon.

Its quite good by itself but still I find it lacking final touch to be used on client projects…

So issue is following… The geometry what I get from the addon is difficult/unusable to modify in geometry nodes. For example to add inserted roof tops or 1st levels like in big buildings etc…

Good thing is that you can also get just the base plane of the buildings, so that you can extrude it however you want.

The question is this…
Collection 1 - has Blosm addon 3D buildings !separately!
Collection 2 - has flat base planes of the buildings !separately!

Is there a way to read from collection 1 the height of the individual buildings and then use the data to extrude the individual planes to correct height from collection 2.