Against the background of increasing rentability problems and changes in tenant composition in the post-war middle-rise housing stock in Rotterdam, the study examined whether it makes sense to continue operating, improving or demolishing the post-war housing stock unchanged, what requirements the stock should meet, and what target groups the policy should focus on. The policy recommendations include: maintaining a submarket of low-rent porch and gallery flats, creating a submarket of single-family houses to promote inner-city flow, and creating a submarket of flats with modern housing standards through renovation.