Which area in Singapore has 3-room flats around 700 square feet?

In Singapore, you can find 3-room HDB flats around 700 square feet in newer developments such as Punggol. For example, a recent transaction involved a 721 square foot 3-room flat at Northshore Drive, Punggol. This shows that certain 3-room flats in Punggol are close to or just above 700 square feet, aligning with your criteria. Other HDB towns with newer BTO projects may also offer similar unit sizes, but Punggol is among the most notable areas for such layouts.