RESIDENTS living near the G20 "restricted zone" around South Bank have been told they will not be able to leave or enter their homes when any of the 28 leaders are on the move.

Other apartment and property owners throughout the CBD may also be required to provide private vehicle details to police, as more information emerges of the biggest security event in Queensland's history.

The Courier-Mail can also reveal a "solid" wall will be built around the Stamford Plaza in a bid to further boost security, increasing the likelihood of US President Barack Obama staying at the five-star hotel during his Brisbane stay.

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The forum on November 15 and 16 will see 4000 delegates and 3000 media representatives flood the city, with the State Government introducing legislation last year setting out "declared" and "restricted" areas and giving police extra powers to deal with protesters and potential troublemakers.

Strata Community Australia, which represents the interests of nearly 400,000 apartment owners statewide, is holding regular meetings with G20 organisers to stay abreast of arrangements for people living within the security zone, stretching from Breakfast Creek to Highgate Hill.

Queensland president Simon Barnard said many owners had indicated they would leave town for the three days to minimise disruption.

"We have been told there will be disruptions while they're moving delegates, and residents won't be able to leave or enter their apartments during that period," said Mr Barnard.

"Where necessary, if something occurs or there's a known threat, residents will be confined to their units."

He said members had received the information "fairly well" but warned the arrangements could change.

A police spokesman said: "It is expected that there will be some impacts in the immediate areas surrounding restricted areas and within the broader declared area."

A G20 spokeswoman said the exact nature of the boundaries would be determined closer to the event, however some leaders will have motorcades of up to 30 vehicles.

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