ah i see what you mean. hes already used props to his advantage in other parts of the map. if you look at the a4 screenshots he posted he uses pipe props to block verticality so people cant rocket jump straight into or out of the spawn area.
he could add some awning props on top of the windows...
they have been made into brush entities (most likely func_details). select all the green geometry and press 'to world'. also select solids to select individual parts in a group. not groups or objects
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