About a decade ago I got a quote from
https://www.yelp.com/biz/bronnis-roofing-and-siding-ann-arbor for doing the roof of a 12,000sq condo.
About $45k then and I'm sure it would be much more today.
Probably not an accurate quote 'cause I bought him lunch but he wouldn't let me take pics.
Setup would have been triangular (to drop the water into the scuppers) custom-made hard foam sheets, covered by plywood (for strength), covered by sufficient mil (25-30?) torch-down rubber sheet up the walls, covered by the white rolled paint.
(edit: Forget the above. Just noticed your location)