For a former bentrynfield site at Bosporus in Istanbul, new concepts for a mixture of residences, working and gastronomy are searched for, in order to connect the city also here spatially, economically and culturally in a new way to the waterside. Parts of existing building substance were to maintain and to integrate in the new structures. The watersides were supposed to be mainly opened to public access, leisure oriented small harbors were to connect to new urban uses. Parking and flowing individual traffic were to give functional access to the new uses in large parts, but – to be located under the ground – not to disturb the new urban space for movement. The whole ground-floor zone is therefore structured – throughout the length of the overall site - by sequences of public plazas and spaces, the uses of built form are – within this structure – complemented by semi-public open spaces. The width of the overall site is equally structured in a new way by a grid of ever new path and view connections between urban edge and waterside. A new spatial differentiation emerges, offering legibility and orientation, and assures equally robustness for change within the partial spatial units in the long term.