That is personal property, not real estate. Maybe a house qualifies as real estate, but the land is the main issue. They distinguished between land and personal property.
No, what it is is "private property" exactly as the Constitution reads.
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.
What is so difficult to understand here? I am not secure in my house and the land on which it is built if the government seizes it so they can build a "for-profit" development against my will...it is not reasonable at all. Taking the whole means to an end...resisting eminant domain ultimately results in an unreasonable seizure. Just ask the folks Bensenville, IL (a Northwest suburb of Chicago) regarding the King Daley's O'Hare airport expansion.