An incomplete list for reference later.
Food:
Water mill (reduce upkeep, add more production instead of food)
Med lab. Costs a lot for what it does.
Garden could be built anywhere?
Lighthouse, Granary, Aqueduct are good. Hospital is okay.
Faith
Temple. beliefs/policies help, but other than the Grand Temple, I find little reason to build these. Faith is easy to come by with shrines and beliefs/policies and the purchase cost reduction in piety is also.
Shrines are fine at 1 upkeep now rather than zero like GEM. Religion is more useful and it is easy to get policies or beliefs to make shrines better still.
Pagoda is still way better than the mosque. Cathedral is arguably okay.
Gold
Market. The luxury bonus on canvansary helps it but weakens markets, which were already a little weak in BNW other than trade hubs. Maybe better to combine markets and caravanarsei, and push it back to currency.
Mint. Almost useless. Especially if reduced to +1 gold rather than +2 (text error). Make it cheaper and apply to gems(copper)?.
Bank-Stock. Markets are better than both. Banks are often good only if you can predict where AI trade will go. Two merchant slots help, but not that much. Stock could use gold on late strategics (oil) for flavor.
Harbor is basically okay except roads are about as good for some ports (one advantage is at railroad, especially since RR doesn't offer any bonus move over roads).
Gold building adjustments should be modest at best as they could have very large impacts on trade routes and gold balance. BNW gold is not bad already.
Production
Forge. Slightly less useless. Helps that it was fixed in CEP. Extra production on mines makes this less important though. 20% would help.
Windmill (costs a lot)
Factories. They're probably fine either way with the +2 bonus on late strategics.
Remove Aluminum requirement on Hydro plant (water mill)
Remove Recycling Center.
Stable is good. Workshop good. Etc. Seaport is okay with CEP +2 production (maybe raised to 20% for sea?)
Military
Barracks-line is marginal in most cases (Hero Epic is worth building a few) but that's okay. Cost reducer in Honor helps but comes a little later (I mostly use it to put up armories and m.academies).
Walls line seems fine if the HP scales like in GEM (hard to tell if that's working yet, combat is not common outside of early game and there's no UI function). Consider lowering building defence across the board to reduce healing slightly and reduce city strength (especially with unit strengths being reduced in 3.18).
The spy buildings still are terrible. Nothing to see here...
Happiness
Zoo/Stadium +1 (+2 on stadium). Zoo is fine as is in CEP at +3 happy. Stadium costs a lot to add only +3.
Culture
Opera House is a little weak next to it's tier. Theaters add culture to resources and museums have 2 slots for theme bonuses. Possibly add +1-2 culture to the building?
Food:
Water mill (reduce upkeep, add more production instead of food)
Med lab. Costs a lot for what it does.
Garden could be built anywhere?
Lighthouse, Granary, Aqueduct are good. Hospital is okay.
Faith
Temple. beliefs/policies help, but other than the Grand Temple, I find little reason to build these. Faith is easy to come by with shrines and beliefs/policies and the purchase cost reduction in piety is also.
Shrines are fine at 1 upkeep now rather than zero like GEM. Religion is more useful and it is easy to get policies or beliefs to make shrines better still.
Pagoda is still way better than the mosque. Cathedral is arguably okay.
Gold
Market. The luxury bonus on canvansary helps it but weakens markets, which were already a little weak in BNW other than trade hubs. Maybe better to combine markets and caravanarsei, and push it back to currency.
Mint. Almost useless. Especially if reduced to +1 gold rather than +2 (text error). Make it cheaper and apply to gems(copper)?.
Bank-Stock. Markets are better than both. Banks are often good only if you can predict where AI trade will go. Two merchant slots help, but not that much. Stock could use gold on late strategics (oil) for flavor.
Harbor is basically okay except roads are about as good for some ports (one advantage is at railroad, especially since RR doesn't offer any bonus move over roads).
Gold building adjustments should be modest at best as they could have very large impacts on trade routes and gold balance. BNW gold is not bad already.
Production
Forge. Slightly less useless. Helps that it was fixed in CEP. Extra production on mines makes this less important though. 20% would help.
Windmill (costs a lot)
Factories. They're probably fine either way with the +2 bonus on late strategics.
Remove Aluminum requirement on Hydro plant (water mill)
Remove Recycling Center.
Stable is good. Workshop good. Etc. Seaport is okay with CEP +2 production (maybe raised to 20% for sea?)
Military
Barracks-line is marginal in most cases (Hero Epic is worth building a few) but that's okay. Cost reducer in Honor helps but comes a little later (I mostly use it to put up armories and m.academies).
Walls line seems fine if the HP scales like in GEM (hard to tell if that's working yet, combat is not common outside of early game and there's no UI function). Consider lowering building defence across the board to reduce healing slightly and reduce city strength (especially with unit strengths being reduced in 3.18).
The spy buildings still are terrible. Nothing to see here...
Happiness
Zoo/Stadium +1 (+2 on stadium). Zoo is fine as is in CEP at +3 happy. Stadium costs a lot to add only +3.
Culture
Opera House is a little weak next to it's tier. Theaters add culture to resources and museums have 2 slots for theme bonuses. Possibly add +1-2 culture to the building?