An off-market home for sale, also known as a pocket listing, is a home available for sale privately that never goes on the public multiple listing service (MLS). Therefor, you’ll never find the property on Zillow, Trulia or any other real estate website. In Marin County, 1-in-5 homes are trading off-market without ever going public. That’s 20% of the market you could be missing if you’re not working with a realtor who’s well connected in the area.