A word of advice if you're considering taking photos from a location adjacent to the construction site --
You should probably avoid walking right up to (and standing against) the fence.
I've seen some online comments and discussion elsewhere with people saying they've been perplexed or slightly peeved after being confronted by security telling them something along the lines of "You can't take pictures here", or "You can take pictures from outside of it, but not on this property" (or "perimeter", which seems to be a word they like to use, though no one quite understands what or where this supposed perimeter is, if it's not the fence).
In trying to read between the lines and do some guesswork, I think it's people hanging around against the fence that quickly attracts their attention, as it's understandable that their immediate thought is likely "what is this idiot doing there, and are they going to try to cut a hole in the fence?", perhaps partly out of years or decades of habit of this having been an airfield, and one used by the military. And obviously they don't want people trespassing onto the construction site.
That said, this isn't an airfield at all anymore. And if they don't want people walking up to the fence, they need to actually put something in place (signs, another fence) to make this apparent, instead of just expecting everyone to somehow know this (through mental telepathy?) when there is nothing at all to indicate it.
And, if they're annoyed now by an occasional person simply walking up to the fence to take a smartphone photo, what are they going to be doing in a just a few weeks when there will start regularly being 50,000 people at a time descending on the former airfield?