I think you are right. Books are on the shelves in the four buildings , sheltered from a possible centennial flood of Seine.
Reading rooms and restoration workshops are all around an underground wood.
You can also see inside the stunning Louis XIV globes (https://www.atlasobscura.com/places/louis-xivs-globes)
On the photo of @lightlover the bibliotheque is on the right, located on left bank of Seine. On the left, the buildings are located on right bank of Seine, Ministry of finances should be there but I donât recognize it.
At the extreme left, the clock is the âGare de Lyonâ clock.
The chimneys are fare away in the suburbs.
Good shot!
And as I am now motivated
ART
In a sense yes! Cafés and restaurants are closed, there is nobody in the streets and in Place du Tertre 
But if you have the opportunity to come back, you will see that it has not much changed and stays a quaint spot.