Exclusive: Kim Kardashian and Kanye West Are Buying A Baller Estate For Mega-Millions

Real estate sources says ... Kim and Kanye are in escrow for a 3 1/2 acre estate in Hidden Hills ... 5 minutes from Kris Jenner's house in Calabasas where they're currently living.
K & K paid $20 million ... the house was listed for $21 mil.
It has 2 pools (one with a slide for North), 2 vineyards and a 1,050 square foot entertainment pavilion. Real estate people in the area call it "the jewel of Hidden Hills."

Kim has been eyeing the home for months, telling people it's her dream home. And get this ... Kim and Kanye have been going back and forth to check out the house ... on Vespas from Kris' house to keep a low profile.

The estate was once owned by Lisa Marie Presley.
Kim and Kanye also plan to get into the house-flipping business.