Honestly the list is shorter than I imagined. Here's my recommendations:
Airfield
- 1 Airlift per turn
- +4 Air unit capacity
- +4
per turn
Rationale: I'm not really sure the airport or airfield should be giving extra trade routes. Yes, they do generate extra commerce, but besides airmail, few industrial goods are transported by air. Flat commerce fits better here.
Airport
- Replaces Airfield
- 1 Airlift per turn
- +6 Air unit capacity
- +8 per turn
Rationale: Same as above. I also axed the +10
with power , it doesn't make a lot of sense and 10%
is a *lot* in the late game.
Castle
--UB:
Citadel
- +25% Espionage
- +50% Defense
- +1 Magistrate Slot
- +3 when connected to the capital
Rationale: I am again not sure why castles would yield extra trade. I guess it could be argued that they would encourage city growth, but that is a stretch, there are just as many isolated castles in history. +3
when connected to the capital seems a far compensation.
City Gate
Remove building. No longer necessary, redundant with City Gatehouse.
City Gatehouse
- +25% Defense
- +50 Defense against Espionage
- Requires 1 citizen to work building
Rationale: Previously this building hurt trade, at the expense of some extra defense. I boosted the defense from 15% to 25%, and espionage defense from 20% to 50%, but required a citizen to "work" the gatehouse, to effectively "man" the walls. So it is a great defensive and counter-espionage structure, but really should not be used everywhere.
Civilized Jewelers' Store
- +5% with Gems, Gold, Pearls, Silver
Rationale: All I did was remove the 15% trade route yield, and 10% foreign trade route yield. The commerce boosts here are plenty, the trade route bonuses were very minor in comparison.
Communication Tower
- +15% Culture
- +1 happy per 10% culture rate
- +3 Artists slots
- -33% Maintenance
Rationale: Replaces Telephone Network, continues that building upgrade chain.
Customs Office & Feitoria
- + 1 per 3 (scaled for map size, 3 is standard) connected foreign cities (max 10 )
Rationale: +1
for every 3 connected foreign cities should make it easy to rack up extra income and encourage open borders.
Expressway
- + 1 per connected domestic city (max 10 )
Rationale: +1
for each city should easily replace the +1 TR and +25% TR yield.
Free Port
- + 1 per connected domestic city (max 5 )
- + 1 per 3 (scaled for map size, 3 is standard) connected foreign cities (max 5 )
- +1 Merchant slot
Rationale: Should be a fairly attractive build now. Before the +10% TR and +20% Foreign TR yield was actually rather paltry.
Harbor
--UB:
Cothon
- +1 from each connected domestic city ( max 5 )
- +1
from Clam, Crab, Fish, Shrimp
Rationale: I removed the default +1
it gave. Cities on the water should have loads of free trade routes already, so the 5
max should be easy to get.
Hotel
- +5%
- +2 per turn
- +1 Merchant slot
- +1
per 25% 
rate
Rationale: Replaced the 5% TR yield with +2
per turn, more than generous.
Hypermarket
- +100% Gold
- +25% War Weariness
- +2 Merchant Slots
- +1 health from Cow, Deer, Pig, Sheep
- +1 food
Rationale: This building is absurdly powerful already. I axed the +20
per turn it provided, as well as the +1 TR. I still think it's too powerful, but we'll see how it goes.
simpleton
)' here's my understanding of how Afforess will improve over vague TR, TRY, and FTRY.
only, didn't do it in AND yet). It may be done quite early if you get for example an eastern and western shore (two or more different water accesses). If you get an enemy in the coast that blocks your TRs one way, you'll probably have another. Barb Coastal cities are masters at TR disruption. Having access to different waters mean more stability in managing TRs and more reliability in its bonus.
per turn
