* A work of art that's appraised at $10,000, for example, but that's priced for sale at $5000, is not necessarily a bargain. As stated above, a retail or insurance appraisal can be many times the fair market value of a work of art. Always determine fair market value first, no matter how big a bargain the seller makes you think you're getting.
In general the aircraft must be at least 500 feet away from any person, vessel, vehicle, or structure. In congested areas the aircraft must stay 1000 feet above the highest obstacle within a 2000 foot radius of the aircraft. There are special rules for helicopters that allow them to fly closer than these general limits.
Today, the federal government considers the area above 500 feet to be navigable airspace in uncongested areas. While the Supreme Court hasnât explicitly accepted that as the upper limit of property ownership, itâs a useful guideline in trespass cases. Therefore, unless you own some very tall buildings, your private airspace probably ends somewhere between 80 and 500 feet above the ground. Paragliders and hang gliders can easily soar above that height, so your ability to exclude a snooping gliding enthusiast appears to be limited.