If an ancom is at your house, or property you should call the police immediately. If you are some rich bigshot who has multiple property in many different places you should be keeping tabs on it, so within a month you call the police to remove them. If you aren't, you are basically abandoning the property.
This is what i'm talking about, ancom level of understanding of the world.
If you are a rich bigshot who has many different properties in different places, you are indeed keeping tabs on it, because those are whole city blocks, sky scrapers or villas worth many millions, with janitors and security contracted to pay attention to it, that is if they aren't part of active business, because you didn't become a rich bigshot by not profiting off your investments after all and property taxes have to be paid even if you don't.
That is if you didn't sponsor half of local PD's station and so the chief will personally call you or your lawyer if a patrol spots something suspicious happening at his most gracious benefactor's property.
However, if you are a middle class family who inherited a house on another end of the country from a dead cousin or something, then you may not visit it often in person, and processing all the paperwork, sale etc may take years, or you may keep it held for your own children.
You think your cheeky support of it is fucking over Blackrock or Bill Gates, but in reality the only people this can fuck over is Smith family who has an inherited second home left by their uncle 4 states over.
Also no, in the squatter friendly lefty places calling the police is nowhere near enough, it's a start of a long, nasty and expensive legal process that the squatters will probably try to run the clock out on you, and possibly also shit up the property as much as possible if they feel like they will lose.
I don't subscribe to your neo fudalism Marduk just becuz "muh commies" are the enemy.
Middle class inheritance (which is what most often this drama happens about) is not neo feudalism, the fuck are you smoking.
It is however something that pisses off commies immensely, and destroying the middle class is one of few things the commies and the rich bigshots 100% agree about, even if they disagree about what should happen to all the property left after the middle class is dispossessed, let's just say both are optimistic about who will get it.