residensea originally quoted $5m, since it became coop like some NYC buildings (and jumby island)
but must be based on size of residence as you note, up to $750K per year, plus refurb expenses? etc

i dont remember for sure if ER made public comment about net worth, i definitely remember quintess doing so, with $10-15m, i was surprised it was that high considering nightly rates, but at the time i wasnt aware of averages (spending averages) and how unusual FT is