Greyfield
As distinct from greenfield and brownfield sites, which require rezoning from other uses to supply land for residential development, greyfield sites are tracts of exisitng residential zoned land occupied by ageing low density housing stock that is physically, technologically and environmentally failing, and which represents significant under-capitalisation of the real estate assets. The term describes a more strategic approach to urban consolidation in such locations, achieving significantly higher housing densities and better urban policy outcomes.