I also like to recommend Cohen and Dube's "Legal, Tax and Accounting Strategies for the Canadian Real Estate Investor" ... it is a good reference over all, but it is a decade old now and could use a refresh to incorporate regulatory changes. 

A lot of forum members are very knowledgeable in their respective fields related to real estate investing, whether that is real estate sales, wholesaling, flipping, rentals, lending, self-directed IRA and Solo 401k investing, or tax and legal guidance.The site has quite a few tools that can be helpful for new members.

Is cash for Keys legal in Ontario and can I ask the seller to do it before buying a property?

A lot of forum members are very knowledgeable in their respective fields related to real estate investing, whether that is real estate sales, wholesaling, flipping, rentals, lending, self-directed IRA and Solo 401k investing, or tax and legal guidance.

(Insider trading is legal for real estate, ask any builder.)

In the past, it was not legal to take action if the company did not have a registration in the state where the property was located.

Unless your business partners have essential skills to complement yours you are better off going solo, this business can get messy.

Although this is a big industry that can't really move elsewhere due to legal issues. 

Is this a legal unit?

There are also legal 2 units with attic/basement unit that will work all over even in prime areas.