Ng Goon-lau pointed at a window inside a dark, tiny bedroom. The window was small and easily sealed, Ng explained, a perfect place for carbon-monoxide poisoning.
A man once burned charcoal to kill himself there. Another tenant, a policewoman, also hanged herself in the same apartment.
"That's why it was so cheap," said Ng, the silver-haired 66-year-old landlord, who bought the tiny 325-square-foot (30-square-meter) unit after the double suicides for just over 1 million Hong Kong dollars ($127,400) in 2010, 30 percent less than the then market rate.