It has always been a big supporter of Ronald McDonald House charities - but this time Ray White Rotorua co-owner Anita Martelli admits she doesn't know quite how much its donation is worth.
It's because the local real estate firm is auctioning off the chance for someone to sell their home through Ray White Rotorua and not pay a cent of commission.
Ms Martelli said just how much the item was worth would depend on the value of the property.
The winning bidder would be able to chose any of the Ray White team to market their property.
In 2014 Ray White Rotorua became the founding member of the Ronald McDonald Family Retreat Business Club.
Ms Martelli said all of the team resonated with the cause, which allowed families of children with serious illnesses to have a holiday at the Ngongotaha lakeside retreat.
"It's so hard to see them struggling with all they have to go through. That's why the team get behind this."
Ms Martelli said auctioning off the no commission prize was unusual.
"We don't know what we are giving away. It's massive really. Hopefully people will see the benefit in it."
Supper Club organiser Linley Parry said Ray White Rotorua had always been "stunning" supporters of the charity.
She said it was part of the original team when looking for a property to set up the retreat.
Mrs Parry said it had been actively involved from then as "enormous supporters" of the retreat, not just financially but spending time greeting families who were staying.
The idea of auctioning off the "no commission" property sale was hatched after last year's Supper Club, Mrs Parry said.
"We are really, really excited about this auction item and can't wait to see how people receive it."
Mrs Parry said they had an amazing range of auction items for Wednesday's fundraiser, and she expected about 140 items would be up for grabs.
This year people can also bid online - even if they are not attending the sold-out event - and bidding has already started on some items.
To find out more and bid go to www.galabid.com/rsc2017.