pictures of the buildings where various Japanese animation studios have their offices: 60 buildings for 43 studios.
Not that you can see what goes on inside, but I find it interesting to see the offices that each studio works from -- from big new steel and glass buildings; from small buildings on back-streets; from floors of buildings, over ordinary shops.
The studio with the most buildings? Sunrise, with offices in a total of ten different buildings. KyoAni has four.
That doesn't necessarily mean either of those studios has the most floorspace: they occupy single floors of many of those buildings. Toei, Shaft, and Madhouse seem to have fairly big buildings all to themselves.
That being said, it looks from the photos as if Sunrise does have the most space of all. They have a big building, plus nine other studios.
The article, if you can read Japanese, also lists the average DVD sales for each studio's major titles. Sorry I don't have time to translate them all.
This site has complete directions, with photos, to many anime studios. The company that owns the site also runs tours. The info, and perhaps the photos, are originally from them.
In any case, here are the three groups of photos, with the Japanese studio names transliterated. Click each of the three sets of pictures to see them at the largest size: