A 149 square metre (sqm) maisonette at Bishan Street 13 was sold for S$1.05 million last month. It is not the first time resale prices there have crossed the million-dollar mark. Another maisonette in the same estate went for almost S$1.1 million in October last year. While not many executive flats like the one in Bishan have changed hands, housing analysts said prices of executive flats are holding up...