Add more detail to it, things like plants, ceiling lights, shelves, bookshelves, desks, and chairs could be added to this model as they are always usually found in an environment like this.
Increase the lighting in the building, it looks quite dark or at least not light enough.
Decide on a different flooring or roof as they both look quite similar and don’t really fit together that great. You could try a smooth roof with a common outline.
Interesting to see you furthering your interests on improvement with this place! In addition to the notable posts above, what I’d suggest you to do is possibly throw in a few textures for realism maybe.
Also, only if this looks good to you, try changing the darker lower section of the walls to Brick.
That’s all from me, good luck on finding further improvement on your Building Area!
Doesn’t seem to be really detailed.
Try adding ,ore parts in your models, not making them from 2-3 parts.
I am sorry for this critique, but in my opinion, more detailed means less blocky.
This build looks amazing, but I would change a few things. First, the floor tiles look a bit too ‘3D’. Second, I don’t think wood is a great material for the wall.