A council house, corporation house or council flat is a form of British public housing built by local authorities. A council estate is a building complex containing a number of council houses and other amenities like schools and shops. Construction took place mainly from 1919 to 1980s, as a result of the Housing Act 1919. Though more council houses have been built since then, fewer have been built in recent years.[citation needed] Local design variations exist, however all followed local authority building standards. The Housing Acts of 1985 and 1988 facilitated the transfer of council housing to not-for-profit housing associations with access to private finance, and these new housing associations became the providers of most new public-sector housing. The characterisation of council houses as 'problem places' was key for leading this movement of transferring public housing stock to the private arena. By 2003, 36.5% of the social rented housing stock was held by housing associations.[1]