The sellers were two women who had grown up in the house, estate agent George Imo said.
The listed owners are Sharon Lesley Moore and Robyn Denise Quartly, according to QV.
A bidding war between four would-be buyers at the LJ Hooker Ponsonby office was watched by members of the Mt Roskill community, including worshippers from mosque next to the house.
Mr Imo thought members of the mosque's congregation might have bought the home, but it sold to a Chinese man who lived with his family in a different part of Auckland.
Mr Imo said the man could be looking to develop the property.
He was delighted with the price the house fetched.
"The CV was about $970,000 so we were looking at selling it for between $1.3 and $1.4 million, but it went way over."
Auctioneer Wayne Espie said the sellers' late father had lived in the house since he built it in 1952. He recently died, aged 92, so his daughters had put it on the market.
Real Estate Institute chief executive Colleen Milne said land use changes in the Auckland Council's Unitary Plan meant many properties had risen in value.