This document is based on Hong Kong Housing Authority of 2011 giving statistics of various types of housing provided to the residences of the island by Hong Kong Housing Authority with graphic information. The proportion of population in Public Permanent Housing includes those in (i) public rental housing (PRH) flats and interim housing (IH) provided by the Hong Kong Housing Authority (HA); (ii) public rental housing flats and Senior Citizen Residences Scheme (SEN) flats provided by the Hong Kong Housing Society (HS) (SEN flats are offered on a ‘Long Term Lease’ basis and a lump sum consideration is payable for each SEN flat by the applicant); (iii) HA subsidized sale flats sold under the Tenants Purchase Scheme (TPS); (iv) HA subsidized sale flats under the Home Ownership Scheme (HOS), Private Sector Participation Scheme (PSPS), Middle Income Housing Scheme (MIHS), Buy or Rent Option Scheme (BRO) and Mortgage Subsidy Scheme (MSS); and (v) HS subsidized sale flats under the Flat-For-Sale Scheme (FFSS) and Sandwich Class Housing Scheme (SCHS). From 1st Quarter 2002 onwards, HOS/MIHS/PSPS/BRO/MSS/TPS/FFSS/SCHS flats that can be traded in open market (i.e. flats sold prior to HOS Phase 3B or flats having paid off premiums) are classified as private permanent housing and are excluded from subsidized sale flats.