1940-1949
  • In post-war times, the quantity of work increases and new cases focus on corporate and contract law. Heikki Borenius Sr. obtains reliable assistance in handling the increasing caseload from, among others, Eero Walentin von Boehm, Lauri Borenius and Eero Rönkä.
  • In 1944, Heikki Borenius Sr. offers partnership to Henrik Castrén.
  • The firm's name is changed to Attorneys-at-Law Borenius & Castrén.
  • Heikki Antero Borenius, son of Heikki Sr., joins the firm in 1947.