First, I would need to see your basement. But without seeing the basement, I would ask the following questions:
Do your Lower Level/Basement have an ingress/egress window(s) ? Does the basement have a sliding glass exit to the outside? Do you have a finished bedroom and bathroom in the basment? Is your Lower Level professionally finished with drywalled walls and ceilings or do you have a drop down ceiling and painted brick/cement walls? Is the cement floor merely painted or do you have a laminent or carpet covered floor?
Tle Columbus Mutliple Listing Service now also allows Realtors the opportunity to add additional finished square footage in a professional finished Lower Level.