From $394,000 As you can clearly see, Jumbo flats still take the lead when it comes to the largest size range for a HDB property. And naturally with that, a higher quantum. A jumbo HDB flat at Ang Mo Kio was sold for a record of $1.03 million, despite the lease of 99 years coming to its halfway mark. Some people may think it’s a questionable decision, but the truth is if you have a big family and require more than 3 bedrooms – a Jumbo flat represents the most affordable option by far. To put things into context – the Ang Mo Kio Jumbo flat above sized at 1,916 sq ft translates to about S$538 per sq ft.