I highly doubt you can make these generalized assumptions from the sale of a single house.
Inflation in the Bay Area is around 20% YoY, based on price increases in the housing market.
This morning, it was announced that the US GDP grew at an annual rate of 2.9% last quarter, accompanied by the WSJ headline "US Economy Roars Back" [1].
20% growth is nowhere near "reasonable".
[1] http://www.wsj.com/articles/u-s-economy-grew-2-9-in-third-qu...