Following on from the Canberra property revalued down 14%, has...

Following on from the Canberra property revalued down 14%, has anyone done any calculations on NTA if the whole portfolio were to have fallen by that amount? The US property stake is a bit of a puzzle. One assumes that property values are falling in the US like everything else. However, long term leases to government tenants generating healthy yields in a climate of low interest rates should surely prevent too much of a fall in capital value. Or should it?
I'm a note holder,still getting paid my 11% so vitally interested in NTA to see if I will get my capital back
I'll get my rusty abacus out tomorrow and see what I can work out but any thoughts appreciated.
(But it might be better to wait until latest report come out)
Pargolf