So you build more buildings, create a housing glut even ... so now even more people move to the area because it's the only place where opportunities exist because it's where the wealthy sprinkle crumbs to their pest scurrying underfoot. All the sudden housing doubles from what it was before the glut and maybe you make 80% more, but all the asset owners are really the only ones who benefit and the wealth concentration cycle simply continues to distort.
What really needs to happen is that the whole area and other urban areas with similar concentrations need to be cut off from things like government funding, any tax advantages, etc. and put those and additional support into areas all around the country. That's really the only way that the cycle is broken, because what you are experiencing is a systemic cycle that no remedial action will have any kid of even mid term impact on without changing the system.