Like Brian Gibbons points out, you are also playing with the fact that prices/values might fluctuate that far out. 

Home prices have fluctuated as much as 30% from peak to valley.

Like every functioning (vs rigged) market, asset prices will fluctuate and the Bay Area will feel it when the time comes.

I've seen it fluctuate.

@Atwan Kwan,My accounts fluctuate, but usually my checking has the largest balance.

This is super important because if you miss on point #1 above, you still have a "buffer" to insulate you to some degree from short term market fluctuations.3)I ALWAYS make sure financially I can easily afford to hold the property through thick and thin.

@Joel Owens  my small city was ranked number one in highest appreciating markets during the last housing crash because it doesn't fluctuate up or down ever...A duplex that someone bought in the 90s for $50,000 (If it's still standing) still is bought for $50,000 today.  

But casflow will not fluctuate as much.

@Jay Hinrichs, I think this is where paying attention to local market fluctuations trumps macro economic predictions for the time being.

If I find a property that cashflows well and is a good price, I don't care about the short-term fluctuations of the market.