They were supposedly in the building, not sure about in any windows and it was ONE STORY. It is a low type building. There is an air conditioner between the two buildings, and he got on that and could reach the roof from there.

"An officer from the Butler Township Police climbed on a fellow officer’s shoulders to check out the roof of the building moments before the shooting — but backed away after Crooks pointed his rifle at him."

https://img-s-msn-com.akamaized.net/...=768&h=448&m=6

https://img-s-msn-com.akamaized.net/...=89&s=116&d=42

Someone took photos of the FBI hosing the blood off the roof after the Secret Service idiot made the comment about the slope.