Historic architecture in Aichi

Are there any historic architectural sites and/or homes in Aichi or Gifu?

I�fm looking for something along the lines of Meiji Mura and Little World. Or even smaller spots like the Old Hakodate Public Hall in Hokkaido - just a single building.

Consider the Chiune Sugihara Memorial Hall

http://www.sugihara-museum.jp/index_en.html

Well Gifu Prefecture includes places such as Takayama, Okuhida, Shirakawago (and other villages), etc:

https://www.japan-guide.com/list/e1220.html

All fit Japanese standards full of historic architecture.

CORRECTION:
All FULL Japanese standards full of historic architecture.

The places you mention suggest you want historic Western architecture? Is that more of what you are looking for?

Near Nagoya (but in Mie), the Rokkaen has a very similar look to the Hakodate Public Hall site you listed:
http://kanko.city.kuwana.mie.jp/t-en/machi/rokkaen/index.html

A few in Nagoya:
https://www.aichi-now.jp/en/spots/detail/955/
https://www.yokiso.jp/
https://seidenpriester.wordpress.com/2013/03/01/modern-architecture-nagoya/
http://www.japan-photo.de/e-nagoya05-modern-architecture.htm

In Gifu, Media Cosmos is well-known for its modern architecture:
https://www.designboom.com/architecture/toyo-ito-gifu-city-library-min...
Taisho Mura (Taisho Village) is like Meiji Mura except for the Taisho era. I have not been there, but it's probably smaller than Meiji Mura but seems to still match your interests.

If you are interested in the old, traditional Japanese architecture, Nagoya's Arimatsu district and Inuyama's castle town are well-known spots in Aichi, and Gifu has Mino, Iwamura, Sawara (Gifu City), Takayama, Gujo-Hachiman, Shirakawa-go, Magome, and many smaller places along the former Nakasendo.