Once you find a few comparable properties, monitor those listings to get a feel for how long it took to rent out. 

So if you look at your weighted average, you are talking about a blended rate that is well into the mid 5's and subject to continue changing over even just the next year or so.

So buying is not for them.The high crime and bad schools may weight on the potential appreciation of the house, and it is not such a obvious good deal for an investor given the tenant risk and the annual $3000 of capital reserves (roof/furnace/windows) one needs to put aside for any house that does not appreciate.

But don't put much weight on the Earnest Money Deposit, as its almost always refundable and a non-refundable deposit is NOT at all common in our market.

I know it's weighted, but how did you get your figure?

If the duplexes are adjacent to one another and the total amount of units is over 5 than the lender would most likely have a commercial appraisal done weighted mostly towards the income approach value.

I had been monitoring bookings manually via a spreadsheet for comparable, but I was thrilled that companies are leveraging API data. 

You will feel 10' tall with the weight off of your shoulders.

But if you want to name 4 or more potential replacements then the aggregate value of the list can be no more than 200% of the value of what you sold - unless you close on 95% of the value of the list (usually that means the entire list).The QI should be monitoring this with you as you go. 

Instead, all of the credit pulls from pre-approvals during that time frame will only carry the weight of a single credit check on your score, which in my experience is no more than a hit of 5 to 7 points.