Should we protect historic neighbourhoods from redevelopment when new homes are desperately needed?

Manuela Saragosa looks at two cities at opposite ends of the spectrum. Historian Qin Shao tells of the destruction of her home city of Shanghai over the last 30 years, as entire districts have been demolished to make way for sparkling new high rise buildings. Meanwhile Laura Foote of the campaigning group Yimby Action explains why young residents of San Francisco like her are demanding the construction of many more affordable homes.

So is it possible to strike a balance between the need to conserve and the need to build? Manuela visits one London building recently saved from the developers - the Smithfield market in London's financial district - and asks Chris Costelloe of the Victorian Society where he would draw the line.

Producer: Laurence Knight

(Photo: An old residential building being demolished to make room for skyscrapers in Shanghai; Credit: Johannes Eisele/AFP/Getty Images)