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Pathfinder Adventure Path, Starfinder Adventure Path Subscriber

When you build a "house" you aren't just building one house. It's representative of building a neighbourhood, or suburb, a block of houses or whatever. The buildings you build aren't literally a one-for-one representation any more than your city is actually built on a perfectly level square grid.
The same is true of farms, when you build a farm it's more accurate to say you build "farmlands", so that multiple farming families can move in and start making a living.