Celeb Realtor Kurt Rappaport -- Forget Minecraft ... K.R. Owns the Best Pad In L.A.

Jay Z and Beyonce may think they lost out on the best house in SoCal -- that's because they never laid eyes on Malibu mega-realtor Kurt Rappaport's $100M palace ... and it's insane.

Don't get too excited ... he's not selling ... but consider this -- the sprawling 22,000 sq-ft Malibu paradise sits on 6 acres and comes with the longest private pool in the entire state -- 168 epic feet.

Kurt, who brokers deals for a slew of celebs, is a patient guy ... it only took 7 years to build the place with a $60M price tag. That's a modest $40M return in the year and a half since completion.

But if you're looking for another reason to hate your life, consider Rappaport is only 43.

Now step away from the ledge.