You should explain to them that wifi is not and never has been UFB, but could be referred to as FSB (fairly slow broadband).
I suspect you would have to take the bodycorp to court to get any results, since they aren't actually interested in consenting anything. There are lots of ways to get cable through a building despite some of them being challenging, but some of the biggest challenges can be the bodycorp which may live in fear of firewalls not being reinstated or having "ugly" capping or ceiling hatches in hallways. They should perhaps consider the possibility of their building becoming a wasteland in the event of a property market correction due to potential tenants preferring properties serviced by UFB.