My pro forma provides financial performance for a range of financial metrics such as cash on cash, IRR, equity multiples and discounted cashflow.

Have you looked at multiple financing options? 

Plan for a single digit rate and 1 or fewer points if you look around aggressively, assuming the only issue is the rolling 30 day lates (I'm not licensed in your state, but am showing that for a California scenario with multiple 30 day lates in the last 12 months).

Did you get multiple quotes? 

He has a great story about one deal where he put in an offer way below asking, had the agent come back multiple times asking him to come up on price over the course of several months and ultimately got the deal (with a big profit built in) by sticking with his original offer based on his due diligence.

There are people that often times offer portfolios of multiple sfh. 

I have been there so can offer some perspective.

If you have to pay off a lease that is 5 years old, you could end up paying 70k for something that you could buy today for 20k (I've seen this many times).If the property has multiple meters, and one solar system, well, things get complicated. 

Idealy I am looking to get a multifamily, but it looks like prices are soooo expensive on most MFR in good neighborhoods that it almost makes sense to buy multiple SFR in certain areas instead

Scenario A (typical) - $500k duplex-$125k down-$375k mortgage at 4.6%Scenario B (modular financing) - $500k duplex-$125k down-$260k mortgage at 4.6%-$75k HELOC on primary residence-$40k loan against 401(k) (technically this would be $165k down, but you get the point)In scenario A, paying off the mortgage quickly makes zero improvement on cashflow until you pay it off completely, or refinance, and there's no point in that if your rate is locked in lower than current(or future) market rates.Scenario B could involve higher interest rates on the HELOC and the 401k loan, but you have multiple, simple, easy options for increasing your cashflow, and then you don't end up playing as much in the overpriced, volatile stock market.