But the good news is that your friend can use any part of the statute they qualify for. 

If you set your late fee as a % you will have difficulty persuading a court that it costs double for you to be made whole on late rent of Unit A than it would Unit B because Unit A's rent is twice as much.If your late fee is a flat amount below bank charges as you mentioned then even in a jurisdiction where no such provision is on the local statute books contract law is on your side.  

As soon as the statutes may allow, it might be well worth the money to hire an attorney and get the record expunged.

And my opinions don't always line up nicely with government rules and statutes.  

If I were you I would tread carefully and do some research into Ontario Fair Housing statutes before I 'prefer' students over families or vice versa, for my rental unit(s), unless they are under the very same roof I live under too and were part of my 'fraternity' or what ever as housemates etc.http://www.ohrc.on.ca/sites/default/files/attachments/Human_Rights_and_Rental_Housing_in_Ontario%3A_Background_Paper.pdf

in my most recent tenant drama, a couple who claimed to be 'husband and wife' and 'childless' turned out to be unmarried, have 3 kids(who were in and out of foster care), along with a whole other slew of mistruths. i'd simply like to know that, given federal (and local) statutes that strictly prohibit discrimination based on family status, is there any recourse in dealing with a situation where a couple presents as husband and wife (and/or as without children) when once approved, they move in and are quite bold about the fact that they actually aren't married and even go as far as to state that nor do ever plan to get married because its 'just a piece of paper'(the latter only with which do i agree) and then nonchalantly march in with an army of undisclosed children they claim are their own?

If appears more than 500 evict through the court process.It's really a grey area call and even the statute codes are not 100% clearly defined.I understand about just moving on and releasing.

Consult with legal counsel before you do anything.The other thing to look into is whether there are any applicable abandonment statutes or ordinances.

It seems that some Property Management companies are going this way to reduce paperwork of sending an itemized deduction list for security deposits.The problem I have is as a Landlord when I go to court I have to present an itemized list, documentation I followed the statutes and the judge usually reduces the amount to what is fair. 

You can also use it to send to a collection agency, if he doesn't pay.And your Statute of Limitations to sue him, would start at the date of the last payment, from what I recall.