I want to profit off the interest rate and perhaps offer 6% rate on what is left on the mortgage.

This is not the case for the majority of metro areas across the US.In less hyperbolic markets there wasn’t an intense amount of speculation so operators didn’t pay high and are weathering the storm on interest rate resets and are finding a way to refinance Deals with maturity walls.I am finding that a lot of killer deals with my clients are happening in the sub 50 unit deal space for those who need to sell, because there’s much less competition in a chase for yield.  

This arrange that you will have will likely be a headache(major assumption on my part).First - Do not do business with a friend. 

Market Selection: What factors do you consider when choosing a profitable location?

They will let you know what you can and can't do without a permit and what you are able to do yourself within the scopes of those permits.My concern is because this is a rental, if you do anything that is not to code and the tenant reports it, you will likely have some much bigger issues to deal with.Given you note this is major rehab, I tend to lean to hire most, if not all, out. 

With an average monthly profit of about $1,175 after expenses, it’s proving to be a strong investment.If your parents sell their home and want to move in, you’d need to weigh the trade-offs—losing that steady revenue vs. the stability of a long-term tenant.

Be clear on terms—percentage of equity, profit-sharing, and exit strategy.

I would say if those are the true numbers, the place would have sold instantly already.Purchase of $179k and rehab of $150k to get a value of $735k is almost unheard of.Main red flag is that something else major is wrong with the property.  

However, I've NEVER had a note called on any properties and the vast majority were "subject too" and/or owner financing.

@Grace Tapfuma I have no idea how things work in Australia but if I were you in the US…Don’t sell the business.Businesses usually sell for a much lower multiple of their products income than real estate does.To be honest, you’ve built out a lot of infrastructure to create a successful business and maybe reinvesting in it would create a much better return on investment.For which you could reinvest those future profits into real estate, once you’ve scaled your business into a money making machine that isn’t so dependent upon YOU to drive the bottom line.I had a friend (38 years old) just recently sell his medical device company for $30M dollars and now he’s using this chapter of his life to passively invest in real estate ventures.Meanwhile, I’ve been toiling out here for 19 years as a real estate investor and I’ve built a portfolio worth $18M and have a net worth of $5M at 41 years old.Sometimes the grass isn’t greener on the other side.Correct me if I’m missing something!