The state government's privatisation push has extended to the sale of government land with more than $9 billion in government-owned property sold since the Coalition took power six years ago, a parliamentary inquiry was told on Monday.

"Over the last six years … approximately $9.14 billion of real property assets have been recycled [sold or leased] by government agencies," the CEO of property NSW, Brett Newman told a budget estimates hearing on Monday.

Another $1 billion in sales is forecast for the coming three years, the committee was told, taking the total projected sales under the government to about $10 billion over its two terms in power.

In total the government's "asset recycling program" of selling off assets to invest in infrastructure has led the government to divest itself of more than 20,000 properties, a figure that excludes the last financial year.