The noble thing looks like it just gives people a viable alternative end game engine. If other players already bought all the harbors and factories, just go nobles instead. That’s kinda meh. The whole point is to fight over the limited buildings.
I like the cloister, though. It’s often meaningless what to get with the settler after the early game, so this fixes that slightly.
I guess two forests are a quarry that doesn’t need colonists in it? Again, just adding more to the game in case quarries run out, you don’t get burned.
Trading post is the dumbest. It’s effectively almost identical to the office. The difference is so small, and in most cases I think an office is just better. Both of them mean you can always trade no matter what. But with the Office you can block a spot on the global trading house to prevent someone else from trading. With the trading post you trade, but you don’t stop anyone else from trading. Unless somehow it lets you trade twice, once in each house.
Library is very interesting and generally powerful. But the opportunity cost of buying it might mean you lose the race in buying something bigger, or that it won’t matter much because the game will end before you get a lot of use out of it.