Serious concerns are being raised about the Berejiklian government's land titles registry sell-off, with multiple parties privy to the process claiming it is being rushed and the wrong model is being used.

One source in the data room says the auction of Land and Property Information (LPI) is going too fast and critical details are being missed, while another insider warns the public might be short-changed $3-4 billion.

The well-placed insider questioned why the government was treating LPI as an infrastructure asset when it was a data and technology one.

"They're using a model that works for ports, toll roads and power stations, but LPI is completely different; it's a technology asset on the cusp of the biggest technological change in 150 years [moving from paper to electronic titles]," he said.