 In 1918 he returned to Ljubljana, obtained a trade concession (building master) and joined his brothers.In Ljubljana he built around 1923 the Credit Bank (today the seat of the National Bank) and at the same time the Ljubljana yard (headquarters of Railway Transport Company).In 1898 he married Paula Faller (Ivanec, Varaždin, 22 August 1864); they had a daughter, Frigga Tönnies.