Real estate Gurus, need some quick insights

[Kamran Malik]

This question is in regards to the lower mainland, British Columbia.  

Hello!  I'm new to this forum but really enjoying reading and learning from everyone.

I have about 800k cash ( from the sale of my personal home).

Can I ask, if that is used as a 20% downpayment on a 4 million dollar property ( multi unit or commercial)...what is the average NET Income I could/should expect?  After paying the mortgage, expenses...everything! Is a 2% Net return reasonable to expect? 

 I'm trying to determine which option is financially better:

A)  put 20% down on a 4 million property and use the Net income to pay for the rent on a family home.

or

B) Use the money to put down on a personal home with a basement suite and have a minimal mortgage ( Around a $1000/month) and get a HELOC to fund my first investment property?

What kind of Net income could be expected on average from a 4million property?