unfortunately you can`t make that kind of processing on Lr.
I do the very same genre of photography,it`s called "Fine Art Architecture"
It is usually Long Exposure images [you can see that by cloud movement ] ,with shutter speeds from some seconds up to ten minutes
That kind of images processed in Photoshop and silver efex pro 2 or any other third party b&w plug-in
You mast mastering selections tool like Pen tool,lasso tool etc
here is a panorama of mine,3 images stitched in Photoshop. ~4 minutes exposure each :
thank you for your reply and stunning phot. I do a lot of long exposure and familiar with the aspect. It was more specifically the effect on the buildings I was baffled by. Are you able to provide a little more info on the technique used in Photoshop?
Mmany thanks for taking the time to reply and share your photo and knowledge.
Apolicies for the typo on your name SolonasM !
i can give you some tips about the workflow that we use
This workflow have two stages the -hard- selections
and the artistic approach
Selections and hard selections are crucial for a flawless image [in panorama above i separate buildings from sky with pen tool but in very precise way; brick by brick (!!!) ,took me about...10 hours to do so.. ]
so you make hard selections with pen tool or lasso tool or anyway you can,of course Pen tool is the best
you can make selections with luminosity masks or color range tool also
After that you start with the image,basically you apply shadows and light everywhere you want so have a pleasing result
play with curves and levels > make two or more layers with different bright values > make masks and mix each layer with Gradients
It`s not very easy to describe the workflow in paper.. [English is not my mother language ether .. ]
You should check in Joel`s website and/or Julia`s for some tricks n` tips also
those two are probably the best photographers of fine art architecture
tthank you so much for taking the time to respond with this excellent information and resource. Very much appreciated.