It will be interesting to bookmark this, and then look at it 18 months from now when the market grows by about 28% (number of rental units in the SF bay area expected to come available due to new construction) SF itself has a huge number of apartment projects being built, as do many peninsula cities.
Not sure if you are implying there will be 28% more rentals available in 18 months than there currently is, but thats totally untrue. There is about 135k current apartments in SF.
About 8,000 new apartments, mostly in mid-rise and high-rise buildings, will come on line between now and 2015. Thats around a 6% increase.
However, remember that we also have population gains in SF right now from incoming tech workers. Prices in rent are very unlikely to go down, however they will most likely stabilize.
You may be saying that more properties are going to be available around SF, but that has never changed value in SF before (oakland boom, for instance) and instead just made those surrounding areas go up.
New building permits in the nine bay area counties. Not just the city of San Francisco. I'll see if I can track down first hand sources for the summary I read.
28% would be a truly astonishing number. Even if all residential construction was rental (no condos or houses) that would still be an insane amount for 18 months.