Astoria’s beloved Neptune Diner, a fixture on Astoria Blvd. since 1984, will close on Sunday to make way for a new high-rise. The Katsihtis family, who could not renew their lease, is bidding farewell to a cherished community landmark. This closure is part of a troubling trend of classic diners shutting down, exacerbated by the COVID-19 pandemic. While the Astoria location is closing, the family’s other diners in Brooklyn and Bayside will remain open.