Embassy of Japanese is a place where nationals can seek counsel when in the country. By prior arrangement, the general public can also take a look at this interesting residence.
You'll soon discover why this Groenkloof diplomatic residence is popular with travelers. If you're searching for more to see and do here, Voortrekker Monument, Kruger Museum, and University of Pretoria are in this area as well. They won't take you very long to get to from Embassy of Japanese.