Any idea what paremeters i can put in MLS to find such types of property?? It wouldn't be a noisy type of business.. i think something like a nail shop..
You can't. Most agents don't know any more than you do with respect to zoning and use. Residential properties in mixed use zones are frequently listed as purely residential properties. The only way to know is to know the zones and the rules.
You need your local zoning maps and complete copies of the ordinances for each area you are looking. Study them, learn where the retail and mixed use zones are. Learn the rules. Become a zoning expert for your area.
Then scan the MLS, looking for properties in those zones. Does this sound like a lot of work? It is. After you've done it, you will be smarter and more effective. And you will have a much more complete knowledge of your market area.
And that can never hurt.