Does fungal growth affect buildings?
Solution 1:
Unburrowed spine/spore-crawlers and flying terran buildings still count as buildings, their attributes do not change (unlike warcraft 3).
Solution 2:
No it does not:
The Infestor's Fungal Growth affects only enemy units within the area of effect, immobilizing them and dealing 36 (+30% to armored) damage.
Source: Liquipedia