There is zero chance of a 50%

[bewildering]

There is zero chance of a 50% drop in house prices. There is a link between house prices and rent prices. Unless rent prices collapse then house prices will not fall by 50%.

Think about it. Even with a 20% drop in San Diego prices, it makes financial sense to buy a property and rent it out.

‘Nominal’ rental costs have never fallen in San Diego and demand for rentals remains high: http://www.deptofnumbers.com/rent/california/san-diego/