Start squatting on it, the real owners will turn up pronto :)
It's undeveloped land, so I suppose I could start planting vegetables on it. But as another commenter said, I'd bet they simply send henchman to destroy my work.
Henchmen have higher ups.
In many places if you squat on a place long enough it becomes yours.
defending their claim to the land visibly
requires them to break cover.
What you do is have the building directly owned/managed by (something equivalent to) a Real Estate Investment Trust [1], then have 100% of the shares of that REIT owned by a company in BVI/Panama/Cayman Islands, where that company doesn't have to disclose its shareholders. Or if you have to disclose beneficial owners with more than 25% of shares, have 5 anonymous companies own 20% each, and claim you just don't know if those anonymous companies have the same ultimate owner.
Thus, the REIT exists to defend their claim to the land, collect rent, manage and maintain the property - just nobody knows who owns the REIT.
Nobody wants to eliminate the property-owned-and-managed-by-a-company-owned-by-other-companies structure, as it's how pension funds/retail investors invest in property. So it's a tough question how to regulate this properly.
I’m not suggesting that we do away with the REIT + corps structure, but just require them to obey AML laws.
Which can also lead to you being charged for unlawful dumping of trash, and if there happens to be a battery or other toxic/dangerous stuff in the trash, that can increase the fines.