It is a unique building. It takes 60 Wood to construct and 30 Knowledge to research.
It makes all machine part factories work faster. Workers can gather knowledge or produce machine parts from wood (2 wood to make 1 machine part)
Upgrades:
Building Recycling: When you destroy a building, you get back half of its cost (costs 25 Knowledge)
Smart Demolition: When you destroy a building, you get back 75% of its cost (costs 125 Knowledge, requires Building Recycling to be bought first)
Sustainable Building: When you destroy a building, you get back 90% of its cost (costs 500 Knowledge, requires Smart Demolition to be bought first)