A new trailer for The Block shows the shocking state of the derelict 19th ...

The 2019 season of The Block is almost here and it looks like the contestants will quite literally have their work cut out for them on the home renovation show.

A new trailer for the makeover program shows the shocking state of the 19th-century backpacker hostel, complete with crumbling walls, garbage and even a dead mouse.

The Oslo Hotel, located in Melbourne's hip suburb of St Kilda, is a grand-looking establishment on the outside, but this is but masking the horrors that wait within.

Time for the health inspectors? A new trailer for The Block shows the shocking state of the derelict 19th century backpacker hostel due to get the makeover treatment on the renovation show in 2019. Pictured: The Oslo Hotel, St Kilda, Melbourne

Time for the health inspectors? A new trailer for The Block shows the shocking state of the derelict 19th century backpacker hostel due to get the makeover treatment on the renovation show in 2019. Pictured: The Oslo Hotel, St Kilda, Melbourne

In the trailer, disturbing black and white footage shows holes in the walls of the interior of the building, plus peeling paint, mounds of garbage, dirty bathroom tiles and even a dead mouse being removed from the premises by the tail.

And the shocked reactions by the new Block contestants say it all - two women are seen staring open-mouthed at the interior as they ruefully inspect the gold-rush era building.

They can even be heard yelling, 'Are you kidding me?!', and 'Oh my God!'

Ick factor! In the trailer, disturbing black and white footage shows holes in the walls of the interior of the building

Time for a scrub! Block contestants must contend with dirty bathroom tiles

Ick factor! In the trailer, disturbing black and white footage shows holes in the walls of the interior of the building, plus peeling paint, mounds of garbage and dirty bathroom tiles

Filming for The Block's 2019 season at the seedy Oslo Hotel began four months ago.

And extraordinary new photos reveal that the renovators have already transformed the 1850s terraces back to their former glory. 

The 56-room hostel, which Channel Nine bought for $11million last year, looks totally different after being repurposed into five welcoming homes.

Eek! Even a dead mouse is shown being removed from the premises by the tail

Eek! Even a dead mouse is shown being removed from the premises by the tail

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