"Abandoned or not , get caught and you're still going to jail !
My friend's place in Norther Maine has sat empty for at least 45 years . The local cops and border patrol have all been told " If you see someone on the property , ARREST THEM !"
Nothing is truly abandoned . Someone , somewhere , owns said property.
This is true, but I will say some properties are much more secured (and therefore cared about) than others.
There was a Christian Fellowship ("Knights of Columbus") center around here, which was abandoned due to an issue with the liquor license and its ability to be used to cater guests. Such a stupid reason... though, the power was and still is on, all of the exterior floodlights are powered 24/7, as are some interior lights. Ironic, because the roof is caving in and the first floor looks like an indoor swamp. Lo and behold though, there is an active alarm system just inside the door with a menacing little message stating, "Enter Code to Disarm" and a glaring red LED. Keep in mind that said door was cracked in at least four separate places- one more hit and the vandals would've gotten in. I think they too noticed the armed alarm system and ran faaaaar away. Maybe it even went off on them.
I would definitely say that the easiest buildings to get into are always the ones without power. If it's a known spot, don't even bother going– it'll very likely have motion detectors and deer cams all around which, when triggered, will notify authorities immediately. My kind of place is one in the middle of the rural countryside, preferably a small business or a commercial property. I don't really like abandoned houses (for the reasons WideLite mentioned) and also because they feel so much more personable inside. Like as if the person trespassing should not be able to see so deeply into someone's life- their bills, bday cards on the fridge, etc.
I'm also not a very ballsy kind of guy. I go with my best friend, who grew up in the middle of nowhere on 25 acres of land, so he isn't really afraid of anything. To me, danger is danger and I can't really scope out the "levels" of danger present from just a cursory glance inside.