A city of 30,000 isn't big enough for tall CO$$$ buildings.
You need the On installation, you can select only the traffic simulator if you want, as that will address your problems, or you can select the whole package.
And you should get rid of the "No Job Zot killer"; it simply deprives you of useful information.
OK, how big of a city do you need for major commercial hi-rises I actually have around 80,000 sims