The Nine Network has officially staked its claim on the infamous Gatwick Hotel, filing documents indicating it has bought the property and fuelling rumours it will be renovated for reality TV series The Block.

A company owned by the network, MICJOY, placed a caveat on the rooming house at 34 Fitzroy Street, St Kilda, this week.

The action cites an agreement with the owners, and confirms the network has a legal interest in the property.​

CBRE commercial property expert Mark Wizel said it appeared the Gatwick had been sold.