Community Housing Aotearoa has suggested valuing the houses based on their "restricted cash flow" value - the value of their future income streams on the restricted condition that they must be retained for social housing.
CHA director Scott Figenshow said a two-bedroom duplex unit in Freemans Bay, Auckland, with a 2011 rateable value of $570,000, would have a restricted cash flow value of only just over half that - $300,000, based on the rent of $89 a week paid to Housing NZ by its 71-year-old tenant plus an income-related rental subsidy of just over $300 a week.
Dr Smith said at the time that he was "open to some degree of discounting" to achieve the target of lifting the community housing share of social housing.
Housing NZ has about 69,000 houses, local councils have about 11,000 and the community sector currently has about 5000. The biggest providers are IHC subsidiary Accessible Properties with about 900 houses, and the Salvation Army with between 400 and 500.
Lifting the community share to 20 per cent by 2017 means adding about 12,000 to the current number, or around 13,000 allowing for some growth in social housing.
Dr Smith said some of the increase would come from new housing and through other changes such as a proposal, currently out for public consultation, to transfer Christchurch City Council's 2000 houses to a new entity that would be owned jointly by the council and the community sector.