Should old buildings be kept or knocked down?

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However, there also have some exist old buildings that have special aesthetic values (e.g.the Forbidden City) or have historical significance (e.g. the courtyard houses - siheyuan) that should be renovated and be protected.
In some a historical sense terms of historical some old buildings carry the collective memory of the whole nation.

In conclusion, as stated above we have discussed, some old buildings because its own reason and without special merit, and to accommodate the urban sprawl can be knocked down, while others that have cultural value or represent the ancient architectural achievement should be  protected via government agencies

Should old buildings should be keep kept or be knocked down?

In contemporary society ,there has a sudden dramatic rise in the urban construction .There are many buildings in our city which people think we should knock them down. Speaking for myself, we should treat ask that question in a different way.
Some old buildings are capable of constructing being renovated, but since the environment is so dangerous they are obliged to rebuild .And Furthermore, for the reason of that some old buildings didn’t have no historical value, they can be knocked down
However,  there also have exist some old buildings that have special aesthetic value (e.g.the Forbidden City ) or have historical significance (e.g. courtyard building) and should be renovated and be protected.
In some terms of historical some old buildings carry the collective memory of the whole nation .
As we have discussed ,some old buildings because its own reason and the urban sprawl can be knock down while others that have cultural value or represent the ancient architectural achievement should protect via government