[Tagging] How to tag a public works facility ?

[Pieren]

It's a small area with several buildings where the municipality is
storing vehicles and the maintenance and repair services. Someone
suggests to use "amenity=public_building" but it's deprecated now in
the wiki... "building=public" doesn't fit well here because it's an
area and is not open to the public.
Something new like "amenity=public_works" ? (0 in taginfo)

Pieren