Wang On Properties , a mid-tier developer in Hong Kong, typically has to set aside tens of millions of dollars to build an exhibition venue every time it launches a new residential real estate project. The venue, ideally measuring 5,000 square feet (464 square metres) and costing between HK$300,000 and HK$400,000 (US$51,000) per month in rent, serves several functions: show flat complete with amenities and furnishings for viewing, and an office for completing the sales contracts . "It adds up to HK$10 million on a two-year leasing term until the whole project sells out," said the developer's chief executive Nick...