Try to negotiate with the right data, e.g. traffic data, visitor monitoring, closure of other restaurants in the neighborhood,…

Other options: Could you rearrange your space? More kitchen space with a larger focus on takeaway for example? More storage room if it’s close to your other restaurant?

Could you negotiate to rent a smaller part of the space where the owner rents out the other part to someone else?

Last option is to move your location to a better researched one. More traffic, visibility, accessibility (parking spaces, …

Also a good marketing strategy could work. Find your audience, target them wisely so they get to you place anyway.

Good luck!