What do you mean by demolition and expansion?

Demolition and expansion means that according to the demolition policy, the relocated households can buy a minimum resettlement house at a price lower than the market price. Specifically, if a demolition house has two independent accounts, then the owners of these two accounts can obtain corresponding resettlement houses according to the definition of property rights and accounts. This policy aims at ensuring the basic living conditions of relocated households and promoting urban renewal and transformation.