Put another way, you can't be guilty of a change in terms provided >>>>>>  there was never any terms written into the lease.... to begin with.

Twenty-four hours is presumed to be a reasonable notice in the absence of evidence to the contrary.(9) Promptly commence an action under Chapter 1923. of the Revised Code, after complying with division (C) of section 5321.17 of the Revised Code, to remove a tenant from particular residential premises, if the tenant fails to vacate the premises within three days after the giving of the notice required by that division and if the landlord has actual knowledge of or has reasonable cause to believe that the tenant, any person in the tenant's household, or any person on the premises with the consent of the tenant previously has or presently is engaged in a violation as described in division (A)(6)(a)(i) of section 1923.02 of the Revised Code, whether or not the tenant or other person has been charged with, has pleaded guilty to or been convicted of, or has been determined to be a delinquent child for an act that, if committed by an adult, would be a violation as described in that division.

Months ago I remember posting about a typical SF deal, only to have people pleading with me; I think it got the worse deal imaginable award or something!

Anyone who tells you different either wants your money to teach a get rich quick scheme, or they are trying to make you as guilty as they are to make themselves feel better. 

However if I use their position against them, by charging them higher rent than everyone else, or threaten to call immigration services on them for whatever reason then I would be guilty of exploitation. 

Joel, I could not agree more - and I have been guilty of this several times in the past.  

But, once it does, don't feel guilty about enjoying the fruits of your labors.

He pleaded with me to give them more time but I stood firm.

Innocent until proven guilty.  

RCW 9A.52.070Criminal trespass in the first degree.(1) A person is guilty of criminal trespass in the first degree if he or she knowingly enters or remains unlawfully in a building.andRCW 9A.52.090Criminal trespass—Defenses.In any prosecution under RCW 9A.52.070 and 9A.52.080, it is a defense that:(1) A building involved in an offense under RCW 9A.52.070 was abandoned;It would be hard to say it any clearer.