But also to a point, it will take a significant amount of work to convert office space to residential. Just utilities alone will be an adventure, and you’d better hope the building was set up with decent truck lines down the core of the structure to begin with. It’s not like “hey let’s throw up some walls, boom, apartments.” You need adequate power distribution, and water/sewer connections to each apartment to fulfill each unit having it’s own kitchen and bathroom. Commercial spaces are generally build to accommodate different usage.