Hi Hahndoe .. "..If I own a $500,000 house and renting it for $15,000 (cash flow +ve) and the price of the house falls to $400,000 then it's still an ok investment.." Huh ???
Rezzy property in general (the smarties can cheery pick ..) is a struggle if you consider TAX and INFLATION for yer $loot.
Historically, yer can improve the numbers by LEVERAGING and getting into the NG racket !!
The long run average of AUS EQUITIES is around +8% (blueies..) which does allow for net wealth creation .. (as long as you are able to dodge black swan events..)
As with all investments you have not made a dime until you sell !!