I wouldn't call that a BASE jump. If it is high enough for a parachute to open then it might be considered a base jump. Min base height is around 150 and that is with what is called pilot chute assistance (PCA).  we don't call jumping off 60 foot cliffs base jumping. And that building is around 60 feet. However it is crazy, but BASE jumping is really when you jump off something that would kill you if not for your parachute. Just my opinion