preservationist
🇺🇸
/ˌprezərˈveɪʃənɪst/
🇬🇧
/ˌprezəˈveɪʃənɪst/
A person who actively works to maintain and protect old buildings or natural areas from being destroyed or changed.
The preservationist argued that the historical building should be saved and not replaced by a modern shopping mall.