I don't quite understand this part. Saving to build them where? On their lot? On owned public lots? How would you make them profitable?

I have a doctor with a very small clinic and a policeman with a small jail and an office, both on their lots. They look nice but are completely useless unless I use various cheats; I do that when I am making stories but not in a normal game.

ETA: Regarding Bulbizarre's links: the first one was blocked as suspicious by Bitdefender. The second mod looks great but the problem is that university study is free where I live and will remain free in my game.

Sounds like a false positive. Don't think I've had issues opening links from Cyjon's site before. It opens fine for me (my AV reacts if there's anything bad on a site, and gave off no warnings). Could be reacting to no www, or "http" instead of https?