Can an apartment complex tow a car parked in the street?

On Wednesday I parked my car in the street along my apartment building. Thursday morning my car was gone and it was impounded at a town yard. My apartment said they couldn’t do anything because they had signage saying the spots were for guests and because I didn’t register a guest the tow company took the car.

What authority could the apartment have to enforce towing? I checked the property maps and the spot I parked in is not owned by the apartment complex. It is within the road easement.