Gunesh was arrested last night, police said today.
The 20-year-old building, which collapsed yesterday, had been rented out to four families, police said, adding that it was yet to ascertain whether the building collapsed due to the blast or had weakened following incessant rainfall in the city for the past few days.
"The building collapse is an accident but it is apparent that the building was weak. Continuous rains made it even more vulnerable. We have registered a case of culpable homicide not amounting to murder and booked him (Gunesh)," a police official said.
The government has announced a compensation of Rs five lakh each for the kin of the deceased.