hdb floor plan room 5i flat singapore 3ng 4a ea sqm types 4s improved flats simplified teoalida sample 1984 block
hdb 3ng 5i executive 4s 4ng sqm teoalida stairs
hdb 5i teoalida improved sqm balcony evolution bto 2010s bedroom
sqm hdb 120 flat 5i teoalida bungalow corridor 120sqm 1930s