Building redevelopment halted.

Our building which is 40+ years old has decided to go for redevelopment, it has been 5 months since we recieved c1 notice from BMC , however there are still members living in the building because they can not afford to move out untill the builder starts paying rent. My question is why has the building not yet been demolished or how long does it take for the bmc to demolish the building after the notice? Also the builder has not agreed to pay rent untill he recieves IOD permission. What are the further steps we should take? Thank you in advance.