Let's not be ridiculous. This room has no artificial light and almost no natural light, minimal ventilation, no water, no electricity, which is the norm nowadays even for cheap apartments.
...but not prisons
In Toronto you could get $1800 a month for that or sell it for $600k.
Were you in prison or did you lose a key?
I lost my ke... wait, no it was a cell in a county jail awaiting trial.