My CPA/attorney can do it for me of course but wants $3500 to do it, which is typical for CA. 

Typically your monthly lease payments with solar are less than the electricity bill would be without solar, so it’s a selling point and benefit for your renters (who doesn’t like reduced utility bills)?

The residential investors just typically do not have the network or know where to find them.Personally and it is just me I do not enjoy SFR and the residential tenant.

When working with a licensed Real Estate Brokerage you know that your Property Manager must adhere to very strict trust accounting standards that are enforced by that State's Division of Real Estate.

I believe if you can qualify for both properties with out rental income you dont have to adhere to this 100 mile rule.You're in a good position because she is not on the mortgage or title on your current FHA property so in theory she should not have to adhere to the 100 mile rule and 25% equity requirement.

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.

It is typically much easier for you to buy "turnkey", however in my experince you will buy better quality from an owner who occupied the property than a hous that has been professionally flipped and the remodelling has been done skin deep.Cash and quick closing is not always an advantage.

What is the typical inspection period?

The cabinets that we sell for house flips are typically white or gray painted shaker doors.

Either before or after the purchase there will typically be an ISO report completed with an inspection from a third party.