Mandir is a place where Hindus go to worship God in the form of various deities. Murtis help them to do this. The Murtis are marble images ceremonially infused with the divine presence of god. They are daily worshipped with five artis and other ceremonies. Mandir – Wikipedia
I guess that Jersey City has had a Hindi community for a long time.
It looks as if the sign had been reused though. The first and last S is different from the middle letters. Anyone out there with some historical info?