"There's only so much wood that a Lumberyard can produce on its own, and that's where the Milling Yard comes in. The Milling Yard will boost the production of wood in Lumberyards."
Milling Yard[ | ]
A Milling Yard is a Stronghold structure that increases the Wood production rate and capacity of a Lumberyard. A Milling Yard may be built at any Support Structure plot.