1) if building is in dilapidated condition muncipal corporation can call upon residents to evict the building as it is dangerous for the occupants of building
2)if some flats are on rent they could not been converted into ownership without your father consent
3) kindly clarify as to whether your father agreed to convert tenancy rights to ownership rights
4) it is advisable to form cooperative housing society of residents of the building
5) redevelopment is a win win situation for owners and tenants