In recent years, executive maisonettes and jumbo flats have been known to defy gravity and logic, in terms of market returns. These tend to be among the oldest HDB flats, which aren’t even produced anymore. But despite the lease decay, these types of flats are known to fetch high resale prices, and reach the million-dollar flat category. Do their unique layouts result in better returns, despite their age? We took a deep dive into the numbers: How have maisonettes and jumbo flats performed?  To get a sense of their performance, we’re going to look at their transaction data from 1990 to 2024. This will give a sense of the wider historical picture. We’re going to look at the standard flat prices (as a point of comparison), while placing maisonettes in their own categories. For jumbo flats, we had to differentiate them by their room type. This is because jumbo flats are adjoined flats (i.e., made by merging two flats)...