By law, all residential buildings should have auxiliary power at least for elevators so infirm people can still use it toget to the ground floor- in our apartments we have to use the stairs at least 8 flights, hopefully we would manage it but if a wheel chair or walker is required the have no chance of getting them to get to the ground floor if a fire starts we has a crew of fire men advising the tenants on what to do, their suggestion was go onto our balcony, hang a sheet or something to attract their attention then they would raise one of their big ladders and bring us down on that, is a good idea, with only one problem, we don’t have any balconies on our building and windows are far to small to climb out of auxiliary power would fix this if elevators were able to keep working in a power cut problem, I worked on the new parliament building in Brisbane Australia, they had a big generator in the basement to provide power during a power cut, one law for them and one law for us peasants who pay their wages via tax payments