The main office of the the Mullumbimby Community gardens was destroyed by fire in the early hours of Friday morning, just one week after the group won an Environment Day Award.
The blaze in the free standing shed unit obliterated the group's historical records, membership information, computers, printers and catering equipment.
Principal coordinator, Jeannette Martin said the damage would cost the group around $30,000.
She was woken by the Fire Brigade around 1.30 am on Friday 13 to be told the building was well alight.
"Police have since told me the fire looks suspicious," said Ms Martin.
"There was a window broken and it looks as though who ever did this had tried to set fire to other structures in the gardens.
"There is damage to one of our shade houses and our main rotunda.
"It's a lot of our history gone; you can replace things but can't get those memories back."
Ms Martin was among 11 locals who last week won Byron Shire Council World Environment Day Awards.
The building was not insured so the group is appealing to the community to help them get back on their feet.
Tax deductible donations can be made at: mullumbimbycommunitygardens.org or by calling 0412 322 355.
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