The Nakamura Memorial Hospital building is shown in a couple of episodes of Kanon. The closest station is a tram stop called Nishijūgochōme Station.
Image from Episode 1 - 09m31s
Nayuki points out the hospital to Yuichi in the first episode.
Image from Episode 24 - 15m36s
They seemed to be doing some construction on the site next to the hospital, so the fence here has been replaced with plate walls.
Image from Episode 22 - 02m05s
Front of the building.
Image from Episode 23 - 21m29s
It started snowing the day I was here, so in this picture you can see snow on the ground if you look closely.
Image from Episode 14 - 20m01s
Front from another angle.
Image from Episode 6 - 17m06s
On the other side of the street from the hospital is also this place where Ayu and Yuichi split up after going to the movies.
This location was visited on 2015/10/25.
Nakamura Memorial Hospital official website
Special thanks to the ones who went here before: