If you need all side on that your options are limited depending on what type of buildings you are after.
You can't see into most buildings model or not, even if you do you only get to see a limited area behind the window,
provided no curtains, tinted windows or simialr are there.
Those rooms could be lit but unless you are doing a night-time scene it will look awry.
Again depending on the scale and the size of the windows it will affect how much you could even see if it was lit.
Sounds to me like you will have to compromise somewhere.