You can also start running numbers on everything you see for sale to practice and you will find quickly what are good deals and not.

With that being said, a shady side of real estate does exist and If you can't see it in the example provided then you may want to reevaluate your business practices.

They would be best familiar with best practices and pricing in your area.  

Adding vents is one of the worst things you can do based on current and old practices (though it was conventional for a period of time).

I'm not practiced in displaying my numbers yet but here's what I can say:Purchase price: $104,000Put down: $10,000Rehabbed the lower unit which costed about $3,000.

He knew general theory but was floundering as far as practical application.

You see there are external forces that we are coerced into facing like it or not.Many shy away from MFU-5+ units, but they do avoid the DTI problem.The practicalities of life and RE will keep at least one foot pinned to the ground.

@Avi Garg,Thank you, I could probably  take a personal loan - have you ever practiced that for buying a property outside of USA? 

What is the common practice for these situations?

Also, in the future you may want to outsource the management to a property manager so you can do other things like go on vacation :) I'm a believer that it's just good practice not to get the habit of "creative accounting" to make a deal seem better than it is.Always factor in the PM fee!