"Overseas investors wanting to buy sensitive land in New Zealand must get consent from the OIO," she said.
"It's important that overseas investors, particularly those intending to undertake residential developments, fully comply with the Overseas Investment Act. When we discover anyone who has broken the rules, we take appropriate enforcement action," she said.
FFG bought the property in October 2013. Two years later, FFG sold it to Grand Sky. FFG and Grand Sky intended to carry out a residential development there.
When FFG bought the property, and later when Grand Sky entered into an agreement to buy the property from FFG, the companies' shareholdings meant they were considered overseas people under the act.
However, by the time the title was transferred to Grand Sky it was no longer considered an overseas person under the OIO rules.
Horne said the office has an important role in protecting New Zealand's sensitive land.
"We take our role very seriously and will continue to pursue cases where people have bought land illegally," she said.
The 2.87ha property is considered sensitive land under the Overseas Investment Act because it adjoins a reserve.
FFG will pay a penalty of $82,500 and Grand Sky will pay $40,500. Together they will pay $10,000 towards the OIO's court costs.