The following is an excellent write-up of the film, so let me just direct your attention to the following blog:
- The Projects (団地, AKA Danchi, Junji Sakamoto, 2016) (Windows on Worlds)
And a few pictures:
Primary filming was at Nishikicho Danchi 市営錦町団地 in Tochigi Prefecture. The following is a comparison of a scene from the film, along with what I believe is the same location from Google Streetview.