The 84 "three-generation" flats offered in the latest Build-To-Order (BTO) exercise attracted more than 300 eligible families, said National Development Minister Khaw Boon Wan on Wednesday.

It was the first time the HDB offered these units with four bedrooms and three bathrooms, and which are 5 sq m larger than current five-room flats.

As these flats were sold together with five-room units in Yishun, applicants will not be caught out if they do not get to select a 3Gen flat, explained Mr Khaw in his blog.

Alternatively, they could wait for the BTO next month, which will have 100 of such units in Jurong West.

Meanwhile, the multi-generation priority scheme attracted 42 pairs of applicants, a "very encouraging response", he said.

Under this scheme, older parents and their married children combine their bids to get a three-room or smaller flat, in addition to a studio apartment or two-roomer.

Singles zeroed in on two-roomers in Hougang and Punggol, as applications for HDB flats drew to a close.