AgriSea set up its seaweed brewing facility in the former River Point packhouse and coolstore in Bilham Road, next door to the Patutahi school, in 2012.
Their resource consent application came up against opposition from three neighbours who were concerned the factory could generate a bad smell.
But consent was granted and local people were hired to collect seaweed; jobs were also created at the brewing facility.
A nearby resident said there was definitely a smell associated with the seaweed brewing process but the company had always been very supportive with local events and fundraisers.
There was a lot of traffic around the site a few months ago, she said, after AgriSea advertised all the bins they used for brewing were available for anyone to pick up for free.
The company that has bought the building wishes to remain anonymous until they make an announcement early next year about what their plans are.