Do you have the Location manager installed?
If you don’t, the option will be in GeoDirectory > Set default location.
If the location manager is not installed, you can only import listings in the default location.
If Google Maps API return that address to be in Heathrow the system will not let you add it for Lake Mary.
I hope you realize this is like asking to a mechanic to fix your car on the phone, it doesn’t make sense.
If you have a NDA with your customer, create a staging website, where whoever is supposed to provide tech support, is able to do so.
There are far too many variables to check (some could be outside of our product like server, theme or other plugins code) to be able to provide assistance without actually looking at the website.
Thanks