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Evidence for an underlying SU(3) structure near neutron number N=104.

It is shown that an underlying SU(3) structure of the interacting boron approximation is exhibited by nuclei near neutron number 104 in the rare earth region. This is particularly evident in Yb and Hf and to a lesser extent in the heavy Er and light W nuclei. Although the structure and mixing effects are complex, this region seems to represent the closest approach to the SU(3) limit yet observed in heavy nuclei.