D22-28 Condo For Sale has been sub-categorised to 4 groups due to their characters/types of hosing as following:-
D22 Jurong are known as the existing economy supports zone and new Singapore CBD of the West (referring to Jurong Lake district project by Government of Singapore). Mostly are condominiums & apartments.
D23-25 Hillview, Dairy Farm, Bukit Panjang, Choa Chu Kang, Lim Chu Kang, Tengah are known as local residential zone and economy supports zone. largely are condominiums, apartments & Executive condominiums(EC)
D26 Upper Thomson, Springleaf are largely Singapore Water Catchment, Parks, Forestry area and low density residential zone. There are two large types in these area, which are landed residential(landed houses) & non-landed residential(condo & apartment).
D27-28 Yishun, Sembawang and Seletar are exiting economy supports, specially Sembawang the water transport Supports (referring to Sembawang Ship Yard) and Seletar, the air-transport supports (referring to Seletar Aerospace Park. These area are also contain large water catchments, parks, greeneries, forestry area and wild life preserved area of Singapore Island. Majority are condominiums & apartments. Landed House (Bungalow, Semi-D, Terrace Houses) are along Sembawang Road & upper Thomson Road.