I have tried to look there also, but I suspect that this tower will not need much time to get to 10st levels. That list is quite useless (it should be possible to use a filter to sort it by GB).
If it's a commonly found building though some of the ones put up won't be leveled very fast as they'll be planted by new players without the contacts to move it further.
Logical spots for it might be the EMA or LMA bonus questlines. EMA it could replace the monastery that conceptually was to help you defend your city *snicker*. LMA is an age where new players often start worrying about plunder a lot more due to escalating costs for goods buildings as well as escalating need for goods.