The property backs on to the Brisbane RiverA RIVERFRONT house that was not even publicly listed for sale has sold for $4.15 million.In a secret deal that has earned the owners a whopping $2.3 million, the house was sold “off-market” by Place Kangaroo Point agent Luke Batchelor.The contract on 124 Quay Street was settled on Wednesday. This house (centre) has sold off-market for $4.15 millionMr Batchelor said the owner of the contemporary tri-level house drove past another house he was selling on the same Street, and made an approach.“He came to me and said he was considering selling the house in the new year, and asked if I could put some feelers out to see if anyone was interested,” Mr Batchelor said.It took one week to get a successful offer, with Mr Batchelor saying the owner ended up with multiple offers.Property records show the owner bought a vacant block of land at 124 Quay St for $1.85 million in 2015, and constructed a new four bedroom house. Mr Batchelor claimed the sale was the “highest in Bulimba on a 405sq m block”.More from newsParks and wildlife the new lust-haves post coronavirus15 hours agoNoosa’s best beachfront penthouse is about to hit the market15 hours ago RENO: Century-old character home restored to former glory in Bulimba BULIMBA: Rugby star Quade Cooper and model Laura Dundovic list Brisbane love nest Rugby star Quade Cooper and his model partner Laura Dundovic are selling their Bulimba home. It is publicly listed with Ray White Ascot Pics Adam Head An off-market sale occurs without public advertising, and involves real estate agents contacting interested buyers privately.Off-market sales are popular with high-profile people who want to avoid any publicity around the sale of a property, and buyers who also wanted to avoid the limelight. Mr Batchelor said another off-market property, also in Bulimba, was expected to sell before Christmas.He said the agency, as do many, kept a database of potential buyers who were looking for a certain property.For example, buyers may be looking for a home in a particular suburb or street, with a sought-after school catchment zone, or they may even be looking for a unique home.Agents can then match off-market properties with willing buyers on their databases.Mr Batchelor said he had completed “five or six” off-market sales in the past two months.As for the new owners of 124 Quay St, Mr Batchelor said they were a young family with connections to the medical field.Property records show the highest price paid for a house on Quay St was $5.33 million in 2016. That luxury house sits on a 872sq m block.The sale of 124 Quay St will make it the fourth highest price paid for a house on the prestigious street.