A property which was a key focus of the investigation into the disappearance of Christchurch man Michael McGrath is up for sale.

The property, in Candys Rd, Halswell, was subject to a major search and forensic testing by police.

The property was subject to a major search and forensic testing by police.

It is the home of prison officer David Benbow, a friend of McGrath's, who has been missing for 140 days.

On Thursday morning, the real estate sign had been smashed.

Early in the inquiry, Detective Inspector Darryl Sweeney said Benbow was a "person of interest" who needed to be eliminated from their inquiries.

Last week Detective Inspector Sweeney would not comment on whether Benbow was still a person of interest. He was not available yesterday.

The 1980m2 Candys Rd property has a rateable value of $680,000. It is a deadline treaty sale