Building Placement
From Tycoon Online
If you have bought zones and a building but you can't place it, chances are you bought zones in the wrong part of the city. Check the details for the type of building you bought -- it will say whether it needs to be placed in the countryside or downtown.
If you are using a tablet or smartphone, you will need to tap TWICE on the upper-left zone where you want to place the building, then tap the confirm button near the bottom.