A mega mansion on one of the largest waterfront land parcels on the Central Coast is set to shatter local property records.

The five-bedroom, East Gosford property with incredible views of Brisbane Water and 702sqm of internal living is being offered to buyers via private treaty.

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It is the first time it has been on the market since it sold in 2014 for $4.05m, according to CoreLogic.

McGrath - Lindfield's Neo Wang has set a $5.5-$6.05m price guide on 39-41 Caroline Street. A sale within this price point would see the mansion eclipse the current $4.9m suburb record held by 51 Caroline Street by upwards of $600,000.

Mr Wang said the 2218sqm property - one of the largest on the Central Coast - is a rare offering.

"It is hard to find another comparable property like it on the Central Coast," he said.

"This one has a view from nearly every room of the house, which isn't always the case for a waterfront house."

Constructed with no expense sparred, the luxury mansion features a private boathouse, slipway, jetty and a wet edge swimming pool. A rooftop terrace, manicured gardens and a level lawn is also found outside.

Inside has grand interiors with soaring high ceilings and oversized rooms. The property has a huge granite kitchen with an island bench, walk-in pantry and a breakfast bar, while a private guest quarters adjoins a waterfront indoor spa pool.

The main bedroom has a private balcony, and a combined wardrobe and ensuite bathroom. Other bedrooms either have a balcony or water views.

For those working from home, the home office ticks all the boxes in terms of size and million-dollar views. Other features include a rumpus room, gym, four-car garage and a gas fireplace.

Interest so far has come from a mixture of Sydney-based buyers and those already living on the Central Coast

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Originally published as Central Coast mega mansion to rewrite records