“A handy barn roof with no-one on it.”
Not only that, but commercial buildings have roof access via ladders on the side of the building or via roof hatches. There are NO visible hatches (or, surprisingly, any other equipment) on that roof. So did he climb an exterior ladder? All exterior ladders on commercial buildings I’ve seen are padlocked and secured. Admittedly, my sample size is small, but I cannot imagine building security leaving an exterior ladder open for use by just anybody strolling by.
There are pictures of the ladder and comments about its advance placement. The shooter was confronted on the roof prior to the shots and SS backed down supposedly.
I think this was a SS management failure. I think the news and agency handlers have the truth so obscured it makes Daly Plaza look open and shut.