There are no 'cut n dried' answers to the question of ignoring a sign on a door with no legal force, but is the right and privilege of the property owner. I've said before it makes absolutely no sense when I'm standing armed 1000ft from a school yard and totally legal, but if I take one step towards that school yard, now I'm guilty of a felony. Or if I'm legal walking up to a municipal building while carrying and legal, what magic is it that makes me illegal the instant I step over the threshold of the front door of that building. Or what if I'm driving to a school to pick up my grand kids and while parked on the school grounds waiting for the dismissal bell, I suddenly realize I'm still carrying my CCW that I simply forgot to remove and leave at home while I pick the kids up. We all have at one time or another simply forgotten we were carrying due to the familiarlity of the gun on our side and simply not thinking to remove it. There's no doubt I'm in violation of law, but my choice is to either sit quietly waiting for the kids to come out to the truck still carrying, or leave the area and find somewhere to safely leave/store my gun, then go back to the school to pick up the kids. There's many more just this stupid, but no need to go on.
If we violate either of these laws, stupid or not, we're in violation of law. Now with the private property owner's sign in the window ..... two things come to light here in my mind. I know the signs have no backing in law, just as the 'STOP' signs inside the confines of a private property parking lot don't. If I chose to ignore the sign and enter the premises, as long as I'm undetected, I'm OK on a legal level, but must console myself on a personal level since in effect I've trampled on the owner's private property rights. If however I am detected and asked to leave, then I can be cited for trespass if I don't immediately leave those premises.
Ah, but there's more to it ...... if the 'private property' in question is typically open to the public for public use, then I personally don't put quite as much stock in a sign as I do if the sign is on his private property where the public is typically not invited nor allowed. For example, his home. I would never enter someone's home armed if that property owner requested that I not do it. It's his property, his rights, so it's his rules, no question about it. The other scenario wherein the property is in fact privately owned property, but for the use and enjoyment of the general public, such as retail stores, amusement parks, etc, etc, then I place an entirely different light on it. Basically in some cases I'll ignore the sign and enter even when armed. On the other hand in different cases and based on what I've written above, I won't. When/if we take either stand, we must accept our own decisions, the basis for those decisions, and the possible/probable results of those decisions.
And previously I mentioned there were many more really stupid laws regarding carrying concealed that make absolutely no sense, so I'm going to list just this one more. With all due respect to any/all LEO's on here, or retired LEO's, I personally find it ludicrous that a LEO is allowed to carry in places where I would be in violation of law. In my prime, I was pretty equal in training and competency of most any major LEA, yet I'm disallowed in some places where the LEO's are allowed. By that same token, I think LEO's should be held to the same standard as us 'regular folks' when it comes to either ignoring or respecting these signs not backed by law. As Mr Greener so eloquently said he is/was made legal to carry in almost any situation in the state of Florida either by virtue of being a LEO, a private investigator and/or body guard, and a state licensed CCW carrier. OK, I'll concede the "being a LEO" part, but where does it make any sense for him to legally carry as a PI or body guard, when someone else isn't legal as a mechanical engineer or brain surgeon under the same situations? And don't misunderstand what I'm saying here, I have absolutely no qualms about Mr Greener on a personal basis. I'm only mentioning him because he made my points so clear in his earlier post. To remove any doubt, I will say here and now, I have the utmost respect for Mr Greener as we have respectfully and intelligently discussed other issues in the past. It's the idiocy of the laws I'm talking about.
And I'm fully aware of the training and competency differences required of a LEO and a mechanical engineer. However I see no difference in the PI and the ME, neither are law enforcement but both are professional jobs, or the body guard and the brain surgeon. They are all professionals, just in a different trade. All can be trained to a similar degree of competency, but the law is not bound to any competency level, only to the name of the job. Yes I know it requires a certain level of proficiency to get a PI license, that's not the question, and I know I'm painting with a broad brush so I'm counting on y'all understanding I'm not arguing for/against any person or even any profession. What I'm arguing is the total idiocy of some gun carrying laws, and/or the basis for them. Go back and read my first paragraph if necessary.