@Diane G. Per your words, "The house I bought for $750K in 2004 is now $$2M.... Yes, it could go up to 2.1 or 2.2 by end of 2018... But I am very convenienced that it will drop back down to $1.5M in 1-3 years.....In stead of paying for $2M and pray for the 2.1, I will just wait for the $1.5M to fall on my lap by WAITING...."
You have done great in that investment!....Are you convinced enough of your 25% decline in 1-3 years to sell your property now at $2M, realize a $1.2M pre-tax gain and then buy it back when the market drops?....Or if you don't want to pay the related capital gains taxes, have you refinanced all the built up equity and maximized your war chest so that you can take advantage of the bargains, if and when similar properties drop back down to $1.5M?
Personally, I agree the continued rise in the Bay area real estate and stock markets for that matter seems unsustainable but who knows when the party will stop. That said, the longer it goes, maybe the larger the correction will be.