. >> reporter: michael simonson, norristown code enforcer, says this brick structure was being illegally rented. >> we can't determine how the building was broke p up, if multiple apartments or it was one big living space. >> reporter: records show it's a single family home, young kim of north wales listed as the owner as well as his wife, purchasing the home ten years ago. >> since 2006, it's been listed add owner occupied, no rental. >> reporter: we found three doorbells, and the mailbox marked apartment. >> reporter: do you know how many utility accounts were operated from there? >> we don't at this time. >> reporter: we learned young owns the neighboring supermarket and laundry mat, and asked to speak to him, we were told he was out. the blaze that gutted young's property claimed lives of two sisters, an elderly man, and another man we learned in his mid-oos. today, we shot this exclusive video of the fire marshall and insurance investigators back at the scene, again, concentrating efforts inside the side porch or sun room. it's where investigators believe the fire began. you've got