Housing is always a key battleground in cities, where planners face a constant struggle to provide enough good quality, affordable homes within the constraints of local economics. Squaring this equation with the complexity and expense of staging the Olympics is one of the greatest challenges host cities face – and it’s what’s most likely to determine whether their residents feel it was money well spent in the long term. There are notorious failures such as Athens, where the accommodation built for the 2004 Games has become a crumbling, semi-deserted sink estate. But even where regeneration is considered to have been successful, in cities such as Barcelona and Sydney, there are often significant compromises on affordability and sustainability. I investigated how London’s Olympic delivery team are trying to keep their promises in this piece for Modus, the magazine of the Royal Institution of Chartered Surveyors.