Nosh secured a suitable building close to Tauranga's CBD - the exact location is still secret - and plans to open in August.
The Blennerhassetts said a second store was always part of their plans but the partnership with Nosh made it happen faster.
"When we started we didn't want to be one store so it was a case of how do we get to that point of being able to grow and becoming more than just a single food retailing outlet, knowing that volume is absolutely key," Mr Blennerhassett told the Bay of Plenty Times.
Nosh's much larger buying power allowed it to offer better and more frequent specials, attracting more customers.
Nosh management had already found a possible site for a new store and a 50/50 ownership deal was part of the arrangement that allowed Good Food Trading Co. change to a Nosh Food Market in October.
During their deliberations, the couple learned that less than 20 per cent of customers came from the harbour bridge's western side - meaning a largely untapped market on the other side.
Despite the harbour bridge, there remains a psychological barrier between Tauranga and the Mount, Mr Blennerhassett said.