Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Ciudad Universitaria de Caracas' has mentioned 'Buffer zone' in the following places:
Occurrence Sentence Text Source
It was also recommended that a buffer zone be initiated to the south and west of the site to protect from urban developments threatening the site.
No buffer zone was identified at the moment of inscription since the hills to the north and the highways to the north-east and south-east provide protection.
However, the growth of the residential/commercial areas to the south and west boundaries require definition of a buffer zone.