Info: *(number) Shows what level the building is
Info: You must have all previous levels of a building to get the another level i.e. to get Barracks *3 I must have Barracks *1 + *2

Example:
Building Name + Level - What it grants access to/gives you - Cost to build

TOWN BUILDINGS
Town Hall *1 - +100 Gold Income P/W - 400 Gold
Town Hall *2 - +200 Gold Income P/W + Access to Taxation - 500 Gold
Town Hall *3 - +350 Gold Income P/W + Access to build *4 buildings - 750 Gold
Trading Post *1 - Access to trade Farm Foods
Trading Post *2 - Access to trade Potatoes

BARRACKS
Barracks *1 - Militia, Rifles, Foot Line Infantry - 250 Gold
Barracks *2 - 88th Foot Line Infantry, Light Infantry - 350 Gold
Barracks *3 - Highland Foot, Republican Guards - 450 Gold
Barracks *4 - Coldstream Guards, The Black Watch (42nd Foot), Foot Guards - 600 Gold

STABLES
Stable *1 - General's Guard, 10th Hussars - 250 Gold
Stable *2 - 15th Hussars, Royal Scots Greys, Life Guards - 350 Gold
Stable *3 - Horse Guards (Republican), Horse Guards - 450 Gold
Stable *4 - Dragoon Guards, Dragoons - 600 Gold

FACTORY
Factory *1 - Experimental Howitzer, 5-In Howitzer - 300 Gold
Factory *2 - 6-Iber Foot Artillery, 9-Iber Foot Artillery - 500 Gold
Factory *3 - 6-Iber Horse Artillery, Rocket Troop

DOCKS
Docks *1 - Transport Ship *1 - 450 Gold
Docks *2 - 600 Gold
Docks *3 - Transport Ship *2 - 1200 Gold

FARM
Farm *1 - +50 Income P/W - 200 Gold
Farm *2 - +100 Income P/W - 350 Gold
Farm *3 - +200 Income P/W - 400 Gold
Farm *4 - + 300 Income - 500 GOld

POTATO FARM
Potato Farm *1 - +200 Income P/W -
Potato Farm *2 - +300 Income P/W
Potato Farm *3 - +400 Income P/W
Potato Farm *4 - +550 Income P/W

If you want to buy anything then ask an DawsonProductions to make you a KI and all you need to is post what you want to buy in the comments of your KI