Hi MilwRdPaul,
A little searching revealed the 720 Grant Street Station is now the Marathon County HeadStart Buiding(or was) the building used by the insurance company.
The Marathon County Historical Society may also be of assistance. They have a map of another showing a station by the river with info on the architect. 209 W. Washington St., 1899.
Fun research! Nice Buildings! Hope that helps you.