I would say they will give you the best run down of the market and area (they are sales people, however).

Looking for "AS IS"NY State purchase contract formI have a potential buyer for a house I put up for sale on ZillowAnyone have a good source for a NY State contract to purchase form I can fill out for them to sign?

19 rent houses are up for sale.

So I have a lead on a property that is a private sale.

In other words, a commercial line of credit on the whole value of the property.I've got my eye on a 12-unit complex for sale for just under $500K. 

But on a preforeclosure whole sale, who takes care of the existing mortgage loan?

Are banks open to short sales and if so what are the typical LTV’s today?

@Jehd Jones, another thing to consider is if there is any chance you will sale this property in the next 5 years. 

Provided you owned the property at least two of the five years prior to sale AND occupied the property as your primary residence at least two of the five years prior to sale, all of your sale profit up to $250K per taxpayer can be excluded from capital gains taxes.  

If it is determine that utilities exist on site, you will need to hire a civil engineering company to coordinate with the utility companies or manage any necessary utility relocation.