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Lam traveled alone to Los Angeles from Vancouver, British Columbia on Jan. 26 and was last seen five days later by workers at the hotel. She intended to travel to Santa Cruz, about 350 miles north of Los Angeles. Officials said she tended to use public transportation and was in touch with her family daily until she disappeared.
Lopez said the hotel has four cisterns on its roof that are each about 10 feet tall, 4.5 feet wide and hold at least 1,000 gallons of water pumped up from city pipes.
Lam's body was found Tuesday morning at the bottom of one cistern that was about three-quarters full of water, Lopez said.
The opening at the top of the cistern is too small to accommodate firefighters and equipment, so they had to cut a hole in the storage tank to recover Lam's body.
The cisterns are on a platform at least 10 feet above the roof. To get to the tanks, someone would have to go to the top floor then take a staircase with a locked door and emergency alarm preventing roof access.
Another ladder would have to be taken to the platform and a person would have to climb the side of the tank.
Lopez said there are no security cameras on the roof.
The Cecil Hotel relocated guests in 27 rooms to another hotel on Wednesday, but 11 rooms remained filled, Powell said. Those who chose to remain in the hotel were required to sign a waiver in which they acknowledged being informed of the health risks and were being provided bottled water.