The attached article, which has just appeared, summarises the situation surrounding the redevelopment of Liverpool Station pretty clearly (and fairly).
The key is that Network Rail does not have – or chooses not to have – money to maintain and develop the station without selling off the air rights above the station. It has allowed the station to run down in order to secure public support for the planned redevelopment. It shows how far we have lost a feeling for the importance of the public realm.