Why would a multi-level building need to exist right in front of the White House and why won't the MSM talk about it? lol

I've been watching the Live Cam off and on all day. They've been doing some construction on it, although I can't tell if they are taking down certain sections or rebuilding them. Some solid panels were removed from the top area, and if you see this picture here - some wood has been replaced to the left and right of the railing. Not sure what they are doing on the level below either, but they are actively doing something to this structure. They had a boom there earlier, ladders and many people - but I still can't figure out what it's for.