Wherever there are houses haunted by misfortune, Teru Oshima wants to hear about it.
Mr. Oshima has built one of Japan’s most popular real-estate websites by compiling an online map showing properties with histories of ghastly events. In Japan, that is valuable information: Landlords often give a discount to renters willing to take property that has a stigma.
Take a cramped three-story apartment building in northern Tokyo that has had more than its share of unhappy news, including a drunken brawl in 2006 that took the life of a construction worker who was hit with a beer bottle.
Mr. Oshima gives that building three fire icons, one for each unnatural death that took place on its premises. “The fire icon is partly inspired by the Michelin stars,” he said. “This one would be a three-star property.”
His website meticulously maps out such properties, making it both a landlord’s nightmare and the go-to online address for bargain hunters and superstitious Japanese
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Japanese law obliges agents to inform prospective tenants of “important” matters involving the property and previous tenants, although it doesn’t spell out what these specifically include, said real-estate lawyer Nakao Seto. Court precedents suggest that concealing the sordid history of an apartment could expose landlords to liability.
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Mr. Oshima got into the haunted-house business from managing his family’s real-estate firm. He used to conduct background checks on properties he was interested in acquiring, compiling the information for internal use. While physical defects were easy to detect, gathering knowledge on past residents proved to be challenging.
“So I switched my approach, and focused on collecting day-to-day information for future reference,” said the 36-year-old. Police and newspaper reports, tip-offs from fellow agents and old-fashioned legwork were initially his main sources of information. He later started a website and threw it open to the public to contribute, Wikipedia-style.
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“If the information is correct, fine. But if it’s not true, it could be devastating to property values,” said Kiyoshi Hoshiai, a Tokyo landlord. Anonymous online users have also criticized what they consider the site’s bad taste.
Mr. Oshima is unfazed. He said information is mainly contributed by sources he considers trustworthy, and that his staff monitors what comes in, deleting any entries that seem dodgy. Viewers have also become quick to point out mistakes.
“My aim is to disclose any information that may prove useful for prospective tenants, regardless of whether property owners like it or not,” said Mr. Oshima.
His goal is to eventually map the whole world.