In northeast Ohio, the winters are generally zone 5b to 6b depending on exact location and whether you are in a Lake Erie microclimate. This means your "maybe Brazilian rain tree" is most likely a species of genus Robinia. If it has white flowers, it is likely Robinia pseudoacacia, the "black locust". If it has purple flowers it is likely Robinia hispida, R hispida is planted as an ornamental. R. pseudoacacia is more often than not an invasive, rarely planted on purpose. I love the fragrant flowers of pseudoacacia, oddly it has proven difficult for me to keep alive in a pot for bonsai. It goes wild in the ground, but in a pot, not so easy, at least for me.
