  A symplectic polarity of a building {\Delta} of type E6 is a polarity whose
fixed point structure is a building of type F4 containing residues isomorphic
to symplectic polar spaces (i.e., so-called split buildings of type F4). In
this paper, we show in a geometric way that every building of type E6 contains,
up to conjugacy, a unique class of symplectic polarities. We also show that the
natural point-line geometry of each split building of type F4 fully embedded in
the natural point-line geometry of {\Delta} arises from a symplectic polarity.
