Combine those factors and start thinking of nightmare scenarios, because they are very real and you must be proactive in policing against there potential to occur. 

Property classes are different from neighborhood classes, and many people often use them in combination.

However, when you combine the income from both the units, I think you will end up with more income after a year or two than with a SFH renting by the room.  

Additionally, the study should contain 13 principal elements.WHAT ARE THE ELEMENTS INCLUDED IN A COST SEGREGATION STUDY REPORT?

This is the “over night” success that’s taken 20 years.2 - Superior uncommon knowledge, combined with experience and capital and a willingness to take a risk (speculate).  

It’s a great way to grow faster.HELOC or Equity Tapping: If you have equity in another property, using a HELOC or cash-out refinance could help cover the down payment without affecting your DTI as much.Seller Financing or Creative Deals: Look for sellers willing to finance directly, which bypasses traditional mortgage qualification hurdles.Scaling quickly often involves combining strategies—play around with what works best for your goals.

The combination of all the above puts me shoulders above majority of the investors.

Then, just three weeks before closing, my largest commercial tenant—who brought in as much monthly revenue as all 25 mobile home tenants combined—announced they were moving to a location closer to their main office.

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

I don’t know if the cause was fraud, incompetence, or a combination, but it is really sad.I was able to work directly with my borrower and my loan is still performing (amortized it rather than keeping the balloon).