Vertaling van "historic site since there are very few such buildings anywhere else " (Engels → Frans) :

I think that alone should elevate the building to the status of a national historic site, since there are very few such buildings anywhere else in the country, if any, that I'm aware of.
Rien que cela devrait suffire à ériger ce bâtiment au rang de site historique national, car il reste très peu de bâtiments de cette sorte dans le pays, et aucun que je connaisse.