The purchase was conditional on the sale of their Mount property, leading to the Stewarts accepting a "very attractive" offer for 42 Marine Parade.
It was set down to be auctioned this Wednesday by Bayleys.
He confessed to experiencing an attack of nerves on the night before they signed the sale agreement for their Mount home.
"After being here for 20 years it will be quite a wrench.
"I love the Mount - there is certainly something about it."
Mr Stewart said he had been toying with the idea of shifting for several years and felt good about owning a 2.2ha orchard, producing export-quality fruit.
"It is like starting life again. It is the second half of my life and I am doing something new and exciting.
"It will be quite a learning curve." The orchard is a short distance north of Katikati and has a 1990s home, which they intend to renovate.
Mr Stewart, who is still an elected member of the Bay of Plenty District Health Board, said he had no ambition to re-enter local government politics.