There is a Jack in the Box, a Del Taco, and an Arby’s nearby, and there used to be a McDonalds a couple blocks away. What would be a legitimate reason? It is zoned for commercial.
Not to mention the supremely popular In-N-Out Burger drive-through a block or so away in the shadow of the 24-R runway at LAX. That’s the In-N-Out that Sean Hannity insists upon when he visits.
For the same reason my town has a zoning ordinance against drive-through establishments of any kind (including banks) in the downtown area: The parcels of land are small, the block faces are short, and there are multi-story buildings right up on the sidewalk along the property line. It’s impossible to add multiple curb cuts to accommodate a drive-through business in that area without creating a safety hazard and a congestion problem.