You could capitalise your family benefit or whatever it was called. But for state housing and the big building programmes of the 50's and 60's it was much easier. Imagine hnz owning Otara, having dozens of builders , producing their own limited range of designs and simply building as they pleased on their own land, no consents required. Saved massive time and cost. Those days have long gone.And State Advances iirc would accept a deposit based on Child Welfare payments capitalisation.
Pretty sure that how it worked