Here is a great idea.
You build a big new beautiful condo bulding. Then you load it from the bottom to top. So far so good.
Of course it takes a while to finish the building and load it. But no problem as the units are almost sound proof - so you don't hear construction or anything. Well - almost anything.
You see a small sound will travel through the airducts. A tiny sound.
Beep Beep Beep of the dying fire alarm. And (beep beep beep) it goes off every (beep beep beep) few seconds until you want to cut off your (beep beep beep) head.