If you are iterating over an object, you need to use the each key, value in obj
notation:
each key, city in cities
h2 asdf
each foo in city
.col-md-4
.row.bottomPadding
.col-md-3
img(src=foo.logo_image_url)
.col-md-9.text-nowrap
p.nav.hide-overflow= foo.name
solved How to render array of array of objects in Jade