In Hangzhou, declaring a historic house requires consulting the urban planning administration bureau, and the real estate administration bureau.
As of 31 June 2011, there were 287 declared historic buildings in Hangzhou, proclaimed in 5 batches.
In the near future the sixth batch will be issued, which includes 51 historic houses.
75 buildings were declared to be the first batch of historic houses in Hangzhou, May 2004.
Media related to Hang Zhou historic houses at Wikimedia Commons