The very first scene in Ant-Man
is set in some sort of S.H.I.E.L.D. building. The first image of the movie is a dramatic presentation of the building that seems clearly to be under construction. We might imagine that completion of the building might be tied to the upcoming plot. ... But then we never see that building in the rest of the movie.
I imagine that completion of the building is part of some other plot line somewhere else in the MCU. So what is the building, and what is its story?