At some point in the past, the windows in this building were removed, leaving the facade looking out of place in this really fantastic looking building.
It is unlikely that the owner may want to re-instate these windows or indeed if the planners will allow it.
This is an extreme example of losing a set of sash windows but a greater threat is the replacement of these classic designs with contemporary uPVC windows.
There is an arguement that such new windows are more efficient and require little or no maintenance. We have not as yet seen a hundred year old uPVC window, but know that they are liable to fail
over time, just as the traditional window, but with one exception, they cannot be readily refurbished or repaired.