The aircraft crashed in a residential area after a loss of control by the pilot. The aircraft was climbing through an overcast in IFR conditions and last reported 'four' in response to a request for altitude. This was the last radio transmission received from the flight. The aircraft was seen by witnesses diving vertically from the clouds. It leveled off for a short while and then went into a nose-up 90 degree bank at low altitude. It contacted the ground in a 90 degree left bank and cartwheeled. A total of five single family residences, three automobiles and some landscaping received damage in the accident. No persons on the ground were injured. The weather was reported as 1500 ft overcast with tops 4000 to 4300 ft. Visibility 2 miles in haze. Post accident examination revealed both engines operating at impact. All aircraft components were accounted for at the accident site. Some small items of fairing and aluminum skin were found along the flight path for a distance of 2 blocks.