Especially in case of unclear title it's a good thing to have the building occupied as a squat. It prevents further detoriation of the building and urban bligh

Especially in case of unclear title it's a good thing to have the building occupied as a squat. It prevents further detoriation of the building and urban blight in general - the occupants will see that the roof is tight and that the windows remain whole. Whoever owner there is may lose out on the real estate, but an abandoned building isn't worth much to begin with, and the city benefits at the end of the day.