"TaxSrv" wrote in message ...

That would be Part 77 of the rules, but it covers only affected
airports which are available for public use.
For a private strip, any obstruction erected so as to deny the owner
of the landing strip free enjoyment of his property is a private legal
matter.

The clause for towers in vicinity of airports applies only to public use.
However, a 500' tower would need to be reported regardless of where
it was built and it's quite possible it would interfere with some other (public)
airport.