Thanks everybody for your comments.
I have processed this image on my calibrated monitor and posted late last night. The details at the back were visible but just, that was my artistic intention. This morning I have looked at the image on my tablet and smart phone and the both don't show any details in the darks, the blacks are plugged. So here is another version with some more light in the background and a bit less contrast, hopefully this will show better on mobile devices.
I have then processed another version as suggested by Asher, with more lights in the windows and also in the background.
And finally, I have pushed darks to the extreme just to demonstrate that there really is usable detail in the darks.
Out of the three, I prefer the last one, but I would like to enhance whites further so that the light trough the windows appears more contrasty and I would enhance the blacks too to the degree they appear as in the second one.... I agree with Asher that the light coming through the window should be more punchy! I have the opinion that if the shot is processed with less DR..., it will only loose unnecessary info... yet, the result will be (even) more "photographic".
Also, I have a feeling that this shot is best to be processed with Capture One, this should improve both tonality and contrast on the windows further... Perhaps with a little extra work, some light beams (or a sense of them) will be able to appear...
@Jerome, in recent Nikons the ability to record more DR, doesn't force someone to use it... IMO there is two kinds of DR, the one the sensor can record and the (obviously personal)
usable DR... I do also only care on what I find usable as you do, but what is usable is there only after the image is processed... For example, with most of MF, usable DR is considerably more (to most photographers taste) than any FF DSLR, while recent FF Nikons appear to record a bit more on the sensor...
From this POV, one doesn't have to end up with a "dull" picture (as I think you implement) to achieve max possible DR... Recent Nikons do beat the Canons in usable DR too... OTOH, some of them (D4 to be exact) can both record impressive DR (maybe a bit less than D800 at first sight), but
after processing for natural "punch" in HLs and LLs, it manages to retain both the correct contrast and detail (and colour too as a consequence), ...yet with impressive DR extension, that improves over D800 if the later is processed to achieve the same look.