When does a homeless person squatting in an abandoned building not commit trespassing?

In examining the circumstances under which a homeless person squatting in an abandoned building does not commit trespassing, the scenario hinges on the legal definition of trespassing, which typically involves entering or remaining on property without permission from the owner. The correct situation is when the building is not posted against trespassing.

If a building lacks proper legal markings or signage indicating that entry is prohibited, it can be inferred that there is no explicit indication of trespass as defined by law. Many jurisdictions require clear signage to communicate that unauthorized individuals are not welcome. Thus, if the property owner has not taken steps to clearly indicate that entry is forbidden—such as putting up "No Trespassing" signs—then entering the building does not constitute trespassing, as there is no formal notice of prohibition.

While the other situations might evoke sympathy or considerations of necessity, they do not legally exempt a person from the act of trespassing. The presence of personal circumstances or awareness by the owner does not negate the legality of trespassing unless there is clear consent or lack of prohibitive signage. Thus, the crucial factor in this case remains the absence of posted restrictions in relation to trespassing laws.