When and Where to Build a Subcity

Trojan129

How to obtain Lab, Tower, Tavern in Subcity, I see only Banks when 2 sub cities were built on lev 6 land resources.
Never mind. I found answer in Basic guide as below:

Banks

Main City / Subcity

Only Subcity built on level 6 or higher land have this infrastructure. Can increase the amount of coins earned through taxing.

Laboratories

Main City / Subcity

Only Subcity built on level 7 or higher land have this infrastructure. Can increase the amount of coins earned through taxing.

Towers

Main City / Subcity

Only Subcity built on level 8 or higher land have this infrastructure. Can expand this city's field of vision.

Taverns

Main City / Subcity

Only Subcity built on level 9 or higher land have this infrastructure. Can speed up the recovery rate of Gairo's STA.