A large wager on Hong Kong and China real estate is backfiring on one of Singapore’s top banks, which is facing up to mounting troubles in the region’s deteriorating property markets.United Overseas Bank Ltd. over the years financed real estate abroad including hillside luxury homes in Hong Kong, a five-star hotel overlooking the city’s central harbor, shopping malls and a Shanghai life science park. It also lent to Chinese developers. More than 40% of the loans its Hong Kong branch made were property-relat ...