Navi Mumbai is a different city with a different corporation. Mumbai is unlike Delhi or any other regular city because it is linearly constrained. It's 'development' happened more as a series of (crises) responses to surging populations in the cores that existed then that threatened not only these cores but the rest of the city because traffic in Mumbai really flows only in two directions. This classic 'dissipation' strategy could have worked for Mumbai if it were better planned. Unfortunately, the strategy was opportunistic rather than directed, meaning it seized upon areas that had an existing demographic, private investment or other advantage: eg. Bandra, Amboli, Malad etc. Which is why commercial, financial and other hubs are distributed across the city (and are likely to become even more so as the infrastructural constraints within these hubs catch up) and many financial and other businesses are considering relocating their headquarters to places along the DMIC as the comparative advantage of these locations shrinks over time. That, at least, is my take on this. As a resident and huge fan of Mumbai city, I firmly believe it will have to innovate itself to stay relevant as an employment centre. Creeping encroachment drives land prices and rentals up inordinately every year, with increasingly scarce alternatives within the city to relocate to.