The fire broke out at the Grand Tower Inn hotel located at Soi Charoen Nakhon 14/2 in Khlong San district.
Utcharawadee Chaisuwirat, director of the Khlong San district said that officials will inspect the area and determine the cause of the fire. Witnesses said the fire was sparked from an electrical circuit on the seventh floor.
Hotel guests evacuated and a body of a 30-year-old Thai man was found in a room on the third floor.
The room had been rented by a man named Thanawat since January 22.
It took about an hour to put the fire under control. Twelve people were injured from smoke inhalation in the incident while two victims remain in the Intensive Care Unit.