Mumbai is also a dying city …
South Mumbai has property rates that are amongst the highest in South Asia , and world over purely on a PPP basis, no wonder Property is more precious than life, thanks to the Archaic building laws like the ULCA and Rent control Act, a inactive state and central govt pushed by vote bank politics fearful of change and of a large tenant lobby resisting change.
Worse the Maharashtra state like most others promotes the artificial shortage of property in the island city , through curtailing FSI, to garner revenues via heavy taxes on property transactions with a progressive stamp duty and registration fees and add to it new central taxes like vat, that exponentially increase costs.
It is extremely difficult to find good affordable housing in Mumbai, and property market here defies all logic, with the only plus that people in city limits and more so south Mumbai get guaranteed water and power, something most Indians, or people beyond city limits suffer a perinatal shortage of.
Heavy rains and Crashing buildings are not a new phenomenon and this is routine what is new is cloudburst and sudden disappearance of rain.
During the monsoons in Mumbai, it is a part of the Circle of Life – Some buildings crashing some/ many people dead , the customary visit by the CM, an inquiry that never bears any fruit and life goes on.
Certain shots in the Legendary comedy Jane bhi do Yaroon like the scene with the Builder and the Municipal Commissioner discussing permission for an additional floor at 17 minutes and 1hr 14 minutes still holds good here , though the stakes have gone up manifold and the builder lobby has direct connection with the Center.
There are 19000 dilapidated buildings as per this link. Google Mumbai Building Colapse and you will find a sea of info.
There are still people living in old chawls and old dilapidated buildings at unheard of rents of Rs 5 and Rs 10 frozen at world war 2 levels, leaving little incentive to the builders to invest in the upkeep, leading to this mess, and it is not just the poor that live in chawls, some very rich folks live there too, but are unwilling to leave thanks to its unique atmosphere, comfort level or to other reasons like avoiding taxes.
To understand the unique chawl culture and environment see the movie Praan Jaye Par Shaan Na Jaye.