28K PER MONTH?!!
You would have to believe that you were going to do about 4 Million a year for that to make sense. Are there businesses that do that out of 5400 square feet? Absolutely. But they are not common and depend on great operations, great marketing combined with a location that can provide traffic and has the parking you need to do the volume. At 5400 feet I assume you are looking at sit-down. 4M per year is an average of 11K per day which means you have to do about $15K-20K on your big days. How many seats is that at what average ticket? Will that many people come in your door? The math would be tough for pizza because the average ticket math means you are looking at maybe 3 turns of the tables in a location that size.
Lease rates vary in most markets. I have worked on leases in New York City, Boston, DC, Atlanta, Portland, Seattle, Honolulu, Haleiwa, Maui, San Diego, Santa Monica, Buffalo, Philly, Miami, Ft Lauderdale, Annapolis and other places I am forgetting right now in addition to my home state of Colorado.
The rent on a side street may be 30% less than a location on the main street less than a block away. Never mind the difference between really top flight locations and truly poor ones. In my own town, lease rates range from $8 to $40 per foot. I worked on leases as high as $125 per foot (6000 square feet, $72,000 per month, Manhattan. NOT pizza.). The comments above about the rent and the relation to sales are right on the money. If you can do the sales, the rent does not matter.
What is the right rent where you are looking? I could not say without being there, but a good local tenant rep broker can help you. They can help with what is available, what the true market value of the property is and help you avoid pitfalls in the lease which are all too common.