[On the surface, it looks like your multifamily investments have not served you well so far?]

The typical reply I hear from commercial brokers is “why would I give this deal to you when I already have clients that can close on this”.

Asking upfront "how many clients of yours actively wholesale and do oversee/advised clients on how to legally wholesale real estate?"

I do not anymore because the clients invariably break the rules.

The thinking is wealthier clients tend to be more experienced with a variety of investments and have investment "savvy", can understand risk and absorb losses easier and can understand these complex investments better.  

@Sheila Zhou, There's a lot of numbers buzzing around there and you would be very well served to buy an hour of your accountants time. 

*this post does not create an attorney-client or cpa-client relationship.

https://www.attorneygeneral.jus.gov.on.ca/english/courts/scc/You should be able to find everything you need here.Once you have your LTB ruling you can have that turned into a Small Claims Court order.Finding their new address is you biggest problem however you should have their employer and serve them at work or follow them home from their work. 

His roommates have tried to speak to him but also to no avail.My overarching question is:  Is it worth serving them an Eviction Notice? 

In my experience dealing with thousands of clients and reviewing many potential transactions involving disqualified person the end result was a prohibited transaction.