Public lecture by Dirk E. Hebel at ETH Zürich on September 16, 2014. The talk focuses on the development of different typologies for 5000 newly build housing units in Addis Ababa. The city administration of Ethiopia’s capital commissioned the chair with this task. Already in 2015, these units for no- and low-income families, which are being displaced due to on-going redevelopment strategies, shall be constructed within the inner-city context. The work has to take the existing social and cultural conditions into consideration and, where possible, utilize local materials. Additionally, they need to remain within a given budget set by the city administration. Next to the more obvious urban questions, the work will concentrate on locally available construction methods and materials and aims to develop architecture and construction strategies down to the scale of the detail.