As Dev. Diaries #10 says:
"Dwelling Ownership
The ultimate friendly goal is annexing a faction’s Dwelling to your city. These dwellings have resource yields comparable with the Golden Landmarks (the highest-level economic structures in the game), and the units of the faction are unlocked for production"
Aren't we suppose to be able to produce their units?
When you buy a dwelling you cannot produce theirs units. You only can keep doing missions to keep buying those Expensive units.
"Dwelling Ownership
The ultimate friendly goal is annexing a faction’s Dwelling to your city. These dwellings have resource yields comparable with the Golden Landmarks (the highest-level economic structures in the game), and the units of the faction are unlocked for production"
Aren't we suppose to be able to produce their units?
When you buy a dwelling you cannot produce theirs units. You only can keep doing missions to keep buying those Expensive units.