The real estate company SIVA Herøya AS is owned by SIVA (88 %), and Porsgrunn Utvikling AS (12 %).
The company owns six commercial buildings in the industrial park, just outside the core processing industry area at Herøya. The buildings are leased to a number of different commercial enterprises, to a total of around 30.
The real estate company Siva Herøya AS is focusing on combination buildings. They customize premises according to the customer's needs, and offer office space, laboratory premises, warehouses and workshop halls in The Innovasjonsbyen.