By 1964 over 20,000 new homes had been built, transforming the dense overcrowded and unsanitary slums of the pre-war city into a low density, dispersed suburbia. Most of the city centre shops had been destroyed and those that remained were cleared to enable a zoned reconstruction according to his plan. In 1962 the modernist high rise of the Civic Centre was constructed, an architecturally significant example of mid-twentieth century civic slab-and-tower set piece. The Plymouth City Council allowed it to fall into disrepair but it was grade II listed in 2010 by English Heritage to prevent its demolition.