Conversions are really expensive. If the property won't be sustainable with residential rent then why bother doing the conversion in the first place? Seems like a frustrating way to burn money.
I'm not saying it's impossible, but people drastically underestimate the complexity and cost of converting a commercial property into a residential one. All the codes are different, and all the requirements are different.
Plus these old malls are often garbage buildings which is why they aren't viable as a mall anymore anyway. Better to send a few million cleaning and preparing the site and then build something that's actually viable for housing.
At the end of the day, the buildings in a deadish mall or shopping center aren't worth much. Maybe the land is worth something but, in that case, why not start fresh with a purpose-built development, either housing or a mix of housing and retail.
There are some older buildings in urban centers that probably make sense to repurpose without just tearing them down. but the idea that you'd take extraordinary measures to try to repurpose the Sears, JC Penny, and other mall properties around where I live is just silly rather than just starting from scratch--which doesn't seem to be going much of anywhere.
I'm not saying it's impossible, but people drastically underestimate the complexity and cost of converting a commercial property into a residential one. All the codes are different, and all the requirements are different.