TO UNDERSTAND THIS, we must understand the difference between
2 kinds of motion

motion of a plane around a
perpendicular axis

If the Pendulum was at the

the floor would twist under the pendulum -- the building floor would twist around the earth's axis every 24 hours.

motion of a plane in a circle around an axis parallel to the plane

If the Pendulum was at the EQUATOR

the building floor would not twist at all but the building would travel eastward on the earth's axis

BUT -- it is clear that the pendulum --which doesn't twist-- would stay in its original plane.

--and the pendulum--being tied to the building -- would travel right along with the building with no visible effect -- since there is no twisting motion.
  what happens at points between the Pole and Equator?

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