This 1937 Art Deco gem stands just across the road from Fort Zeelandia in Anping. It's on a side lane of National Victory Road (國勝路). As far as I can tell, Anping is the only place in Taiwan to have a road with this name, though there are National Victory streets in Hsinchu's Zhubei City and Tainan County's Yongkang City. I'm wondering if the victory in question is Koxinga's over the Dutch East India Company, though it may refer to the surrender of Japan in 1945.
Incidentally, the man who commissioned the building of the house is now considered a local land god, and is worshiped in a small temple just around the corner. See the final paragraph of this post for details and a photo.