Construction in Dresen. (Pathfinder: Wrath of the Righteous)

Comrades, such a question.
I am starting construction in Dresen. I look at the "Training field"
"... gives + to all trained units in the neighboring buildings" - actually the question - what does it mean in the neighboring ones? For this, the building (barracks, for example) must be close to each other? Those. touch the full side of the square? Does the angle count? Or are we talking about buildings within the entire city, wherever they are?