You cannot leave the walls alone, typically the paints are not something you'd want in your home. I believe the solution is typically spray-foam insulation to p

You cannot leave the walls alone, typically the paints are not something you'd want in your home. I believe the solution is typically spray-foam insulation to prevent off-gassing instead of sandblasting. Some choose to cover the floor instead of removing it, however this makes the low (8.5') ceiling even lower. These processes increase the expense and waste involved in conversion.