1) When is building retrofitting a must?

1) When is building retrofitting a must? Choose a location on Earth and explain why building retrofitting may be the best way to go, what are the alternatives if retrofitting is not possible. Keep in mind Earthquake risk, tectonic setting, budget, current building codes in the country and current building states of the location you choose. Explain how the factors mentioned before affect your decision. What kind of retrofitting would most likely be needed, if any?