"Really we haven't got anything at all planned once it's sold. It's just a matter of taking a bit of time to reassess. We want to spend a bit more time with the family but also do a bit of travel of travel if we can."
The Guys won't be inactive,. Jo Guy blogs regularly on her makelemonade.co.nz blog - which daughter Anna, Macdonald's ex wife - has just joined.
"We've still got a lot of energy and feel we don't want to curl up and do nothing," Bryan Guy said.
The family farm, off Aorangi Rd, is made up of two properties totaling about 260 hectares. Bryan Guy's parents, Grahame and Winifred, started out about 50 years ago on a 24 hectare section.
He joined a partnership with them for about 25 years, before buying them out at the turn of the century. Over time, the farm grew through acquisitions of surrounding properties.
By 2010, Scott Guy and Macdonald and their wives were shareholders in the Byreburn business and were likely to take it over completely some day.
One of the houses up for sale is formerly occupied by Macdonald. The house along Aorangi Rd that Scott Guy shared with his family was sold previously.
Bryan Guy said he didn't think the property's provenance would put people off.
"I wouldn't have thought so but it might to some people I guess. We're so used to it that we don't really consider it an issue."
Bryan and Jo Guy decided to sell rather than have one of their other children take over the property, where son Callum was now working. Daughter Nikki and her husband James Speedy were also on the farm.
"Jo and I really felt we've been there, done that and it was a bit hard to go back to that. We just thought it was going to be hard to do that again.
"Once the farm is sold maybe we can help the kids in some other ways."
Dairy prices were on the rise too and Bryan Guy thought a potential investor was probably looking at a medium-term outlook.
Bryan and Jo Guy moved into the township of nearby Feilding some years ago. Right now, they're staying.
"We've actually considered moving but we've got all our friends around and network and contacts in Feilding. It's such a great community. I'd be reluctant to move away."
The farm is being marketed by Property Brokers and the two parts are being sold separately.
Tenders for the dairying operation of 204 hectares and the 52 hectare run off close next month, although the run-off part could be sold earlier.
Promotional material describes the larger portion as a "milk factory". Its production per cow and per hectare is in the top 5 per cent of New Zealand dairy farms.