The home builder Sekisui House has finalised its acquisition of an 8.1-hectare site in Baulkham Hills in Sydney's northwest for $210 million.
Sekisui bought the land from property developer Tony Merhi.
It intends to develop it into a masterplanned mixed-use residential community with 1300 apartments.
Apartment building heights are being considered by the NSW Department of Planning for the site at 47 Spurway Drive.
It is close to the Norwest Business Park and the Castle Hill Country Club.
Toru Abe, the Sekisui House Australia managing director, described it as an "exceptional development" opportunity.
"As the construction of the North West Rail Link continues at pace, we intend to create a masterplanned community set within beautifully landscaped gardens and natural forest," he said.
"We plan to showcase our inherent values of developing ecologically sound communities where residents can entertain, play, reflect and energise with easy access to the surrounds, Parramatta and central Sydney.
"With Norwest Business Park, one of the largest employment precincts in Sydney and Norwest Train Station at our doorstep, residents will be immediately connected with existing community and future transport links."