They milked on that farm for two years before heading across to Tapanui for a year's sharemilking.
That farm was sold ''right on the button'' of a $5.40 payout and the couple moved to a sheep and beef farm at Lawrence briefly, before returning to North Otago 12 years ago.
Mr Heffernan first started dealing with PGG Wrightson when he was 18 when he was given his first loan to buy cattle from then Stringer and Co manager Neville Langrish.
Mr Langrish later kept suggesting that he should pursue a career in real estate and Mr Heffernan quipped that he ''finally wore me down''.
He completed his real estate ticket online and has now completed his first full season.
While he had been told that it had been a slow, soft selling cycle — probably because of the dairy industry — he did not know any different, and he had found it ''fine''.
Because he was still farming, he was a regular attendee at the weekly Waiareka stock sale and kept up to speed with pricing and other market factors that farmers needed to know, and his background had been invaluable.
''I have remained completely in touch with the whole sector which is necessary when you sell rural property.''
The role involved representing people's futures; while there was a fiduciary obligation to represent the vendor, there was also a duty of care to the buyer.
Buyers were your next lot of sellers and, as one colleague noted, ''it's a long game, not a short one-dayer''.
Because he was still farming, Mr Heffernan said he was not commission driven, which he viewed as ''just a by-product of making a good sale''.
Mr Heffernan said ''solutions'' summarised the approach that led to his success.
''When you are marketing rural property, your role is to match up buyers and sellers. There is no point showing someone a $4 million farm if they only have a $2 million budget.
''That is just a waste of time for everyone, and will lead to frustration. I've found that, so long as you listen to what buyers and sellers are saying, and can take an inventive approach, you should be able to find a solution that works for all parties.''
The real estate, managing the firm and maintaining an interest in the the couple's two children, Levi (11) and Stirling (8), keep him busy but he enjoys it.
Harness racing has also been a strong interest for Mr Heffernan over the years, including breeding and training.
He still had his training licence and expected he would ''rev up'' when the days got longer.
Oamaru was a ''super little service industry'' town and the expansion of irrigation had been a driving force. It was a service town that was very heavily relient on the rural sector.
''It's a gutsy little town,'' he said.
