This will mean that, under the Unitary Plan, there will be 78.59ha of rural countryside living which could be subdivided into 2ha lots, and down even further through the use of transferable titles.
The "future urban" classification is a transitional zone, which allows land to be used for rural activities until it is released for development.
John Barnett from Bayleys Warkworth, which is marketing the land for sale by tender, said the property's pending future urban zoning would support Auckland Council's drive to increase the population of satellite towns such as Helensville and Warkworth.
"The development of this land would ideally reflect a visionary new owner who can see a growing Wellsford over the coming decades with a thriving residential population, many of whom will be commuters to Auckland thanks to an improved roading network supported by the ability to live in a semi-rural township."
The opening of the Puhoi tunnel express highway in 2009 and its pending extension further north, first to Warkworth and then on to Wellsford, had also shortened travelling times to and from Auckland, Mr Barnett said.
"This evolution of the motorway will really bring Wellsford into play as Auckland's northernmost satellite town."
The land is a few hundred metres from Wellsford Primary School and Rodney College.
He said, with up to 87ha of land able to be developed, the block offered developers economies of scale for the construction of medium to large adjoining residential sections.
Mr Barnett said prices for large-scale development sites on Auckland's northern and southern metropolitan urban limits had risen about 20 per cent over the past two years, so developers were now having to look further afield.
Real Estate Institute of New Zealand chief executive Colleen Milne said there was increasing evidence that Aucklanders were looking outside central Auckland for properties.
"The Rodney and north residential median price has risen to $685,000 in June 2015, up from $580,000 for the same period last year - this is an 18 per cent increase." Tenders for the Wellsford block close on Wednesday.