National Trust has shut its property doors until June 30 2020.
The announcement comes after the recent restrictions announced by Prime Minister Scott Morrision regarding COVID-19.
An email was sent to members supporters to announce the closure.
"We have taken the decision to cancel or postpone all events at our National Trust Properties until June 30 2020," Debbie Mills, CEO of National Trust said.
"We are a community organisation and the National Trust (NSW) values the health and well-being of its staff, volunteers, members, visitors and supporters above all else.
"We are, and have been, acting in accordance with health authority guidelines to ensure the safety of the community is in line with Government policy regarding COVID-19.
"We do this with a heavy heart but in the knowledge that our supporters will understand we are acting in the best interests of the community.
"All National Trust (NSW) events hosted at our heritage properties, by our Branches or our Committees are cancelled or postponed until 30 June 2020. We will review our events programming at this time."
The closure of National Trust properties will affect Harper's Mansion in Berrima and Golden Vale Homstead in Sutton Forest.
Retford Park in Bowral will remain open.
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