Trading Post:
Requires the Wheel and Property.
Cost comparable to the Granary.
1 Free Merchant
+1 happiness with Mercantilism
Dock:
Requires Sailing
Cost about half of Granary
+1 food and +1 commerce from any special seafood being worked by this city.
Required for Harbor.
Move Walls to Masonry.
Give Walls 60% of their current cost and half of their current effect.
Towers:
Requires Construction
Requires Walls
80% of the current cost and half of the current effect of Walls.
Required to build Castle
Smithy:
Requires Copper Working
Cost comparable to the Granary.
+1 hammer
-1 health
an additional +1 hammer with Bronze Working
an additional +1 hammer with Iron Working
Required to build Forge.
Inn:
Requires Record Keeping
Cost comparable to the Granary.
+1 culture
+1 commerce
an additional +1 commerce with Riding
an additional +1 commerce with Politics
an additional +1 commerce with Railroad
an additional +1 commerce with Aviation
Fermentation:
New technology
Requires Agriculture
Leads to Medicine
Allows building of winery rather than Calendar
Tavern:
Requires Fermentation and Pottery
Cost comparable to the Granary.
+1 Happiness
-1 Health
an additional +1 happiness with Redistribution.
It might be better to combine some of the features of Inn and Tavern and have just one building.
Suggest you move Stonehenge to Astronomy.
While I do not like Smokehouse as is, perhaps you can improve it.
Smokehouse:
Requires Pastoralism.
Cost a little less than Granary.
+1 Health from cows, pigs, sheep, deer.
(would have to revise the Supermarket which has these same health bonues.)
Sanitation should increase health; I assume that is where Sewers will come in.
You will need to go through the whole thing and at some point rebalance health.
P.S. On pages 40 and 44 of this thread I gave some other ideas which I hope you will look at again to see if there is anything worthwhile.
Currently working on adding new buildings. So far there's a Well, Sewer, News Press, Cinema and Solar Plant. More to come. If you have any suggestions for a new building (not Wonder) to add, let me know. Whether it's possible would primarily depend on available art and whether there's a suitable niche for it.