On public roads and sidewalks, you need permits and to have submitted a plan showing how much of the footpath/road will be blocked and for how long. You need to show where your bollards and rope or whatnot will be and any necessary signage (like 'pedesdrians keep left’s) that sort of thing.

Once you get the approval, you can jam up the area with a cherry picker/crane until you’re finished and everything is packed away.

So anyway, what I’m getting at, is this is the signage company not getting the permits - which they would have charged Twitter/X for and not an Elon oversight - UNLESS Elon decided to park that crane out there himself and to get whoever to pull down the signage.