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It was once considered the country's most expensive penthouse and has played host to America's Next Top Model, but a newly refurbished luxury pad boasting the nation's highest swimming pool is back on the market.

Perched on the 29th floor of Takapuna's landmark Sentinel apartment building, the sprawling two-level apartment is expected to fetch well over $8 million.

It features its own surround-sound home theatre, 360-degree panoramic views of Auckland and comes with a 24-hour concierge.

But it's not for your average first-home buyer, with weekly mortgage repayments likely to top $10,000 - assuming you can scrape together $1.6 million for a 20 per cent deposit - and body corporate fees, rates and insurance totalling $46,850 each year.

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The 700sq m penthouse, which includes 247sq m of rooftop decking, offers captivating views of the Hauraki Gulf, North Shore beaches, Rangitoto Island, the Waitakere Ranges and Auckland's cityscape to the south.

Three giant bedrooms each have their own ensuite and the high-spec as-new home also boasts a rooftop spa, outdoor swimming pool and inbuilt espresso machine.

The main living area is 25m long and 12m high. Giant sliding doors separate the home theatre room, which provides stunning views up the North Shore coastline.

Three lifts open out to the new owner's private marble foyer entrance, complete with French oak parquet floor. It also comes with four underground car parks for the owner to park his or her luxury vehicles.

The penthouse is being marketed by Graham Wall Real Estate. It has a 2011 valuation of $7.5 million but Mr Wall said: "We reckon it's worth a million more than that."

The apartment, used to film Tyra Banks' show America's Next Top Model in 2009, is likely to attract international interest from the super-rich.

Despite the production crew trying to keep their whereabouts under wraps at the time, bikini-clad models were spied peering over the balcony of the luxury apartment two days after they arrived in New Zealand.

The freehold title penthouse is owned by investment company CK Miracle Ltd. It was bought for $5.2 million in 2010 by former Takapuna Grammar student King Khoo after an $11.2 million sales deal collapsed in 2007. Mr Khoo has spent several years carrying out a refit - reportedly costing "a significant seven-figure sum".


Tyra Banks filmed America's Next Top Model in the luxury penthouse. Photo / AP

Mr Wall said the penthouse offered 360-degree views of Auckland - "almost as good as Google Earth".

There had been interest from a Chinese prospective buyer, but Mr Wall suspected the property could attract a local purchaser.

"I think it's probably going to be a wealthy Takapuna resident who loves the neighbourhood, is selling a big family home and still wants to live in luxury."

Penthouse living
*The luxury penthouse apartment is on the market on the 29th floor of Takapuna's Sentinel apartment building.
*The two-level, 700sq m pad, which includes 247sq m of deck, has a $7.5m valuation but is expected to fetch well over $8m.
*Fully refurbished, it features a surround-sound home theatre system, state-of-the-art security and electronics, rooftop pool, plus brand new kitchen and ensuite bathrooms.
*Comes with 24-hour concierge and offers 360-degree views over Auckland.