How do property rights work when roadways overpass private property?
I noticed at this mall that the expressway passes over the parking lot. Who owns the land under the expressway, the mall or the government? How are property rights handled in cases like this?

The expressway is left of the Trader Joe's in the image and is in Culver City, CA, USA.

https://images1.loopnet.com/i2/gmHvI82aBtbiO-h3ynZEU9nW3uX7s05i39YMjRqN2W4/112/image.jpg
[{"id": "gounfkp", "text": "Should be owned by the government.", "replies": [], "depth": 1}, {"id": "gounkfd", "text": "I bet the highway has an overhead easement that lays it all out. But each property can be different.", "replies": [{"id": "goupsev", "text": "This is likely the case. Easement of sorts.", "replies": [], "depth": 2}], "depth": 1}, {"id": "goup4pz", "text": "https://planning.lacounty.gov/gisnet\nhttps://dpw.lacounty.gov/general/servicelocator/\n\nYou can dig around to find out here.", "replies": [], "depth": 1}, {"id": "gov0qy8", "text": "Depending on where a building is, there are both land and air rights to be concerned about. Maybe the govt bought the air rights and built the expressway. Alternatively, the mall may have bought or is in a long term ground lease on the land. Like others have said, it will also differ based on location bc of zoning in each municipality.", "replies": [], "depth": 1}, {"id": "goxg0hq", "text": "In Manhattan and other dense areas developers can buy and sell cubic volumes of airspace. But the likelier scenario here, already mentioned by others, is some sort of easement.", "replies": [], "depth": 1}, {"id": "gp27vtm", "text": "Usually the roadway has an easement over the private property. As a part of that easement, they would spell out that the overpass/roadway operator would be responsible for its maintenance as well as provide indemnification to the private property owner. If you have a relationship with a title company, you can ask the title company to pull the \"easement agreement\" for the private property by giving the title rep the parcel # and/or the address of the private property. Then you could read the actual document and better understand.", "replies": [], "depth": 1}]