The Nassauische Heimstätte Wohnungs- und Entwicklungsgesellschaft is highlighting a core industry challenge at Expo Real: how to implement energy-efficient retrofits without displacing tenants through rising rents. The Frankfurt-based housing company points to the tension between holistic neighbourhood strategies that integrate social, economic and environmental factors. The issue comes as Germany's housing sector faces mounting pressure to meet climate targets whilst maintaining affordable housing stock. Major providers must balance retrofit investment costs against rent caps, a dilemma intensified by current debates over rent controls and sustainability mandates.