So if you take a look at the attachment, you'll see there's quite a bit of demand from High Tech industry to build in my city.
If you look at the top of the picture, you'll see a large yellow region zoned off for HT.
For the past few years HT just won't build in that area or any other are I place it in.
Desirability for that area is excellent and takes are at 20% for Dirty and medium dirty industry. Also, the tax on HT has been at 5% from the beginning.
What am I doing wrong ?