In the economic upswing of the 1960s, there was a plan to make an industrial park out of Seehausen. The section of Lankenau had to completely give way to the Neustadt harbour and parts of Seehausen were also torn down. With the construction of the harbour, the only direct street into Seehausen which runs along the Weser was now passé. Citizen protests and subsequently recognition among political decision makers prevented the building of a second new harbour basin, which would have meant the end of Seehausen. However, the population of the neighbourhood, which reached a high of 1,530 residents at the end 1950s, was never reached again.