Toretti I know of an eight story strata building in the CBD which last year replaced it’s lift, after giving everyone six months notice. Prior to commencement of work they rekeyed with a security key all fire stair locks on each floor, with a different key per floor, but all keys being able to open the door on the street level. Keys were then distributed to residents based upon the number of bedrooms and number of people registered on the strata roll.
They also put battery operated sensors on each door (from Jaycar or similar) which alarmed if left open for more than 60 seconds I believe.
For the first few days there was absolute chaos, particularly with the units illegally housing seven or eight students in a one bedroom unit, with only one name on the lease, and as such only one key issued.
After the first week it settled down, and funnily enough quite a bit of community spirit end up appearing, with people assisting their neighbours in carrying groceries up the many floors. A few residents, particularly the less mobile, stayed with friends and family during the lift replacement, which would not have been convenient but was understood to be necessary.
The building now has a shiny new lift, and lot less overcrowding!