You currently have expenses of $82k and assets of >$1.3million. Without changing your expenses, you'd need a bit over $2 million.
fugal_c is right about real estate being on a tear the last couple years, but so has everything--real estate, equities, commodities, cars, etc. Could you diversify? Sure. But you need to define specifically what your goal is (reduce risk?), and then evaluate the alternatives according to that risk. WRT real estate, the adage goes something like "you make your profit when you buy it." And right now, housing is crazy expensive everywhere, which makes it a bit hard to justify as an investment.
One other thought--if you were willing to move to a lower CoL area, and take a hard look at your budget, you might already be FI. $40k of non-housing expenses for two people seems high to me.