How do I get some idea of the average days on market in particular markets for house sales without asking a real estate agent? 

I actually bought a 4 unit a mile away for $45,000 last year but that needed about 30K worth of work so I feel this is about right as this one is turn key with no repairs needed.The seller financing deal - Sales price $63,500Cash at close from me $50004 year note @ 4% for remainder ($58,500), monthly payment of $1000 with balloon at the end, no prepayment penalties.Monthly projectionsIncome =     $2200Expense=    $220 management                     $220 CAPEX = No problems yet but "Unknown age" on the roof and owner has had property for 20 years                     $480 Insurance/taxes = Total taxes for 2017 were $4982 on assessed value of $78000 plus $600 a year for insurance

For our ARV we used townhouses in the adjacent developments that are slightly more modern, but priced below those.All of the buyers realtors are looking at the previous sales in our development as comps, and saying we are over priced.  

Is the difference between the current loan balance and the sale price minus the down payment wrapped into the old loan, or will we need to come up with the difference from investors?

Account Closed yes they do other wise it could trigger a "due on sale" out lined in the mortgage note.

I also would like to reach out and help you where I can I currently have contracts and a duplex for sale I'm not sure if your looking for turn key or not maybe we can do some talking soon I think I can help I will send you a dm 

While driving for dollars in one of the most affluent areas in the country (Potomac, MD) I found a for sale by owner sign.

@Tony Willenborg, one thing I have found very effective is find the local online sales groups. 

When you sell you have to make it "sale ready", there's vacancy, and you pay realtors and closing costs.

After a quick conversation with the store sales associate, we realize just how simple the installation would have been had we done it ourselves.