[empyrrhicist]

Incorrect. You can't fly your drone at 2000' AGL in almost any circumstances, anywhere, ever. Elevation is also the wrong term. Drones are capped in the US at 400 feet above ground level, with exceptions for part 107 pilots within 400 feet of a structure or terrain feature, and specific situational waivers.

There is no specific rule against flying even 1 foot above ground over someone else's property, though it's very unlikely that doing so would not violate other rules unrelated to airspace. These include operating a drone unsafely, violating laws against harassment, and photography in a context where someone would have a reasonable expectation of privacy.