Great work so far, the last shot has some cool lighting. As you already said it's not really looking too futuristic right now, which is not a big deal, imo. You could push it a bit by adding monitors, holograms or whatsoever.
My only complaint would be that everything is pretty boxy. Office environments often tend to end up that way it seems. Especially when looking at the first three screenshots. Windows, doors, planters, lamps, floor tiles, vents, benches...they all have the same shapes. The foliage breaks it up a bit which is nice.