The state government is offloading hundreds of harbourside homes at Millers Point without economic modelling or an up-to-date social housing plan, raising doubts over the integrity of the controversial sale.

The absence of both a policy and economic data prompted one housing academic to ask if the public housing sell-off was decided by reading "tea leaves". NSW Labor says the government risks flooding the market with homes, damaging returns to taxpayers.

Residents of Millers Point public housing protest the sale of their homes. Credit:Wolter Peeters

The Department of Family and Community Services on Friday refused to answer questions on why potential economic outcomes were not modelled before former Community Services Minister Pru Goward announced the sale in March.

It has emerged that NSW Land and Housing Corporation Deputy Director-General Anne Skewes told a parliamentary inquiry in May that "I have done no economic modelling" on the Millers Point sale.