Buildings/Fortifications are measured from any part of that model like any other unit without a base
BRB If a model does not have a base, such as is the case with many vehicles, measure to the closest point of any part of that model
Buildings are 100% consider a unit
BRB Buildings are typically units with the Fortification Battlefield Role and the BUILDING keyword, and that are part of a player’s army. A model on or behind a Building uses the normal rules for determining if another model is visible to it, or if it is visible to another model. Each Building has a datasheet, and unless otherwise noted is either a friendly unit or an enemy unit (meaning that models cannot be moved across them, but they can be chosen as the target of an attack).
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AoS: BoC 9k, CoS 3k