Singapore’s property market is enjoying a sudden lift in an economy mired in recession. A category of buyers labelled as “foreigners, unspecified”, possibly including mainland Chinese, are behind the resurgence.Sales of new non-landed homes, typically referring to flats and condominiums, rose for a fourth straight month to 1,233 units in August, according to data compiled by OrangeTee & Tie, based on statistics released by the Urban Redevelopment Authority. The volume is the highest since July…