Everyone has their own analysis but I think it's best to hope for the best and prepare for the worst. 

I would appreciate any analysis help or any tips on how I might have erred.  

I would definitely use some geographic analysis tool - which comes handy when looking at these things. it has made my life much easier.

They typically don't like working for non-clients though so you might have to call a few before someone would help you out.If you don't want to do that you can do your own analysis. 

Rehab estimates, rental comps, market analysis are all learned skills.

Many simply shoot for a yield, a blind shot blindfolded, but the discount represents the risk assumed that places the subject investment in line with similar investment alternatives that carry different levels of risk, it is a risk based analysis.

The Numbers: Purchase: $117,000 ($12k assignment fee included) CASH PURCHASERehab: $53,000 (budgeted $45k)Holding costs: Roughly $15003% concession to buyer: $7110Closing/Realtor/Excise tax 1.78% WA/Misc: $28,500Sold: $237,000Net Profit: $35,283CASH ON CASH ROI: 20.4%I tend to buy conservatively, we build in margins of errors into our analysis incase things go wrong, this way, if something does happen, we still make money. 

He has a lot of rentals here in Oregon and probably does not analysis his checking account that closely or in this case he for sure did not.

I'd like to hear your opinions..Here would be the numbers, and if you see a problem with my analysis, please tell me.6 Unit, Purchase Price 290,000Monthly rents - 4200PI - 1738Taxes - 491Insurance - 266Maintenance (using 10% of monthly rent, property is recently renovated) - 420Vacancy - 420Property Management - 420Cash Flow - 267.00Obviously the cash flow is very low for a 6 unit.

For my initial analysis I use tool created by Emily Du Plessis, which helps me figure out what I need in order to move forward.