The explosion, which happened around 10:30 p.m. Wednesday, hurled debris up to a half mile away, knocked over a van and damaged windows of nearby buildings and cars.
The single-family house was last used as an office by Dr. Matthew Hasford, who is a urologist. The office closed in February.
Authorities said medical records were scattered amongst all of the debris. They said it will be a major task to collect all of the paperwork that survived the explosion and put it back in order.