Alstria Office REIT is concentrating on the refurbishment of its office portfolio to achieve further rental growth. 'We built an office portfolio in Germany worth EUR 1.9 bn in just 2 ½ years, but I don't expect to see such acquisition opportunities in the next 12 to 18 months,' CEO Olivier Elamine said in an interview with PropertyEU at Mipim on Tuesday. 'I do see opportunities though to grow organically through development projects.'