Seoul
The 1989 Loma Prieta earthquake caused major damage to San Francisco.
SeoulSeoulSeoulSeoul
the heart of Dresden
Most of central Berlin was in ruins in 1945. Even the houses that were still standing, were usually heavily damaged. The total percentage of ruined and heavily damaged houses was close to 100%.
If it was heavily damaged, it would cost you big time.
US Army Hickam Field.
Heavily can be used in multiple ways. One definition of heavily is to describe an item that is heavy. Another use of the term can be very slowly, and third the term may be used to mean severely.
The liver can be damaged by all the alcohol that you put in your body if you consme it heavily and abusively for a period of decades.
That will depend quite heavily on the specific city to which your question refers.
The plan for better city low income housing, in the 1950s, was to build large housing complexes. The large housing complexes offered low rent for its occupants.
Garden City was a brewery in the Chicago. I believe the plant closed in the 1950s.