plato left marion around 1920 or 1921 to return to louisville, kentucky, where he continued his career as an architect and builder. his major projects in the louisville area include the broadway temple a.m.e. zion church (added to the national register of historic places in 1980) and the james lee memorial presbyterian church. plato also designed the virginia avenue colored school (added to the national register of historic places in 2004). and simmons college of kentucky's steward hall, a part of the school's municipal college campus (added to the national register of historic places in 1976), as well as two banks in louisville. a residential area that plato helped develop was named plato terrace in his honor. around 1945 he helped to establish the city's westover subdivision of small, two-bedroom houses.