The agent says it should support the contract price but there are no similar comparables to my model that have closed in my community.   

The model works well for me at least. 

you can plug in the numbers to the bp calculator - i use the bp calculator and my excel models to be sureAssumptions as an exampleassume $650/mo rent for each unitassume 8.333% vacancy rate (1 month)assume 40% operating expenses (kinda high but cap ex can be pretty stout)assume a 5% cap rate Cap rates are important to know with these type properties. 

@Ali Kassam one important item to consider when negotiating terms of a loan is the balloon payment.

I can send them clients and they can send me residential clients that don't fit their model.

But you will set out finish needs or other larger items: full kitchen remodel or just new appliances and paint cabinets.  

You need health and safety items in and working.

Mom and pop owners often won't disclose either because they never kept records, or also common, they are writing off a lot of items to the property that make the property appear more financially burdened than may be the case (I may or may not have had a few dozen dinners out with my wife that get booked to my rentals).

What are the most important items to compare?

Those are all short business models based on volume and turnover.