The NSW government has acquired and will demolish almost 20 buildings in Sydney's CBD to make way for the new underground Metro rail track and stations.
NSW Premier Gladys Berejiklian on Thursday revealed between 17 and 19 buildings would be demolished over the next year for stage two of the Metro project.
Stage one, due to be completed by 2019, will run between Rouse Hill and Chatswood at a cost of $8.3 billion.
The second stage of the project - a 30 kilometre extension - is expected to be open in 2024.
It will include twin 15.5km rail tunnels from Chatswood under the Sydney Harbour to Sydenham along with an upgrade of the T3 Bankstwon line.
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The majority of demolitions will occur between Pitt Street and Martin Place with the Metro service eventually expected to carry 90,000 people under Sydney Harbour every hour.
The tallest building to be demolished in the CBD will be 21 storeys, according to the government.
New pulverisers, which Sydney Metro says limits demolition noise by up to 50 per cent, will be used in the works.
