The Trolley Car Diner on Germantown Avenue will serve its final meal on October 15.
The diner opened in the year 2000 with the goal of providing a family-friendly restaurant as well as reducing blight along that strip.
In the past 20 years, Mount Airy's restaurant scene has thrived, and, as a result, the diner's sales have declined.
The diner's sister restaurant the Trolley Car Cafe in East Falls will remain open.