Technically in their airspace though so you might be in bigger trouble than parking. If you tether it to an asphalt ground hook you can claim it’s a tarmac and

Technically in their airspace though so you might be in bigger trouble than parking. If you tether it to an asphalt ground hook you can claim it’s a tarmac and that it’s “parked” for sake of the FAA. You’ll need a “lighter-than-air” certification.