He said the upgrade was the "last piece of the puzzle" of the overall upgrade, which included the development of the winery, zipline and mountain bike tracks.
"We wanted to create a restaurant the city can be proud of."
The restaurant was last upgraded in 2003, so Mr Thomasen said it had been a long time coming.
"We did a lot of homework with the team looking around world-class kitchens."
He said they already knew the location of the restaurant and it was important for them to create a dining experience to match that.
Mr Thomasen said there had been a real focus on making sure the best equipment was sourced for the new fitout, which included more than $400,000 spent in the back of house with a kitchen upgrade, a new tidal mussel tank and a meat aging fridge that displays the meat sourced from Mangatu farms.
The views have also been enhanced with the old windows replaced with double-glazed glass, which also gave better clarity and allowed less framing.
"You didn't get the big panoramic views before."
Other changes included a special bar area so people could mingle for a pre or post-dinner drink. The menu is still buffet, but people can select cuts of prime meat which are cooked in front of them, Mr Thomasen said.
Mr Thomasen said staff were looking forward to working in the revamped restaurant.
"The team are loving the change and getting involved with the new dishes. The chefs love the opportunity to expand their creativity."