Most home sellers would be happy to have a few dozen people attend their open for inspection.

But Melbourne's most famous apartment is no ordinary home.

Thousands of people queued for hours to catch a glimpse inside The Block Sky High when it opened its doors in South Melbourne on Saturday.

The first people - a young man and his mother - arrived at 3pm (AEST) on Friday and braved chilly conditions to camp out for the night.

Not so long ago The Block was a run down motel, but with the help of the five teams competing on the reality television series, the building has been transformed into a modern looking complex.

Its outside wall is a trendy black and contains patches of grass.

Inside, it is stylish and swanky.

As they waited, crowds held pink balloons and wore Block t-shirts and caps.

Charlotte Senior and Nicky Rogalsky wore hard hats and held up signs reading: "We love The Block."

"We really wanted to see Bec and George because they seem really nice and we really wanted to see The Block," Charlotte told AAP.

"We think it will be amazing. We think it will be worth it."

Alix Rogers and her father Garry travelled from Glen Waverley in Melbourne's outer east to be there.

"I just enjoy the show and wanted to see the actual apartments," she said.

Near the front of the queue was Jeremiah Naikovu, 13, whose mother arrived at 5am to save them a spot.

He was hoping to see the apartment built by George and Bec.

"They didn't have as much money, but they did the best out of it," he told AAP.

One of South Melbourne's most famous residents, Father Bob Maguire, blessed the block and promised no harm would come to anyone who lived there.

"It's a spectacle and it's a sense of carnivale," he said of the crowds.

During the decades he has lived in South Melbourne, he has seen the once rundown area completely transform.

"For a long time it was just bare and empty then all of a sudden it has bounced back again," he said.

Fans of the Nine Network show will have another chance to see The Block open on Sunday.

 

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