Try adding 15 degrees to the angle the sun makes with the vertical and subtracting 30 degrees from the angle it makes with the horizontal at the current settings in the render you received. This way, the sun will illuminate the building roughly from the right behind the camera from your perspective. In your current render it comes right from the balcony front and at a pretty steep angle. In addition, the lights remained active even though it was a daytime render, which makes the render a little bit unrealistic.