"The opportunity to sell and leaseback the land and buildings at Richard Pearce Drive is attractive to Synlait as it will free up cash and allow us to pay down debt," chief executive John Penno said.
The lease will have an initial term of 10 years, with further rights of renewal, providing plenty of long-term certainty and flexibility for our business, he said.
Settlement is on October 4.
Synlait is closely allied with dairy and infant formula company a2 Milk, which has a 20 per cent stake in the company.
A2 Milk, whose growth has been stifled by the outbreak of Covid 19 and increased competition in its key market - China - is Synlait's biggest customer for infant formula.
Synlait's annual result is due out on September 27.