As @Zach Mitchell mentioned above you certainly could get an actual appraisal performed on the property  however unless you have it under contract just review the comparables that resemble subject project and have sold in the last 6 months. 

All the work performed was done by an insured and licensed GC. 

As to the "all remedies allowed by law".....generally for a buyer to have the rignt of specific performance,  it must specifically be spelled out in the contract.  

Is past performance indicative of future results?

I am interested in how they are performing.

Your fee structure is compared to other service providers who perform the same basic tasks.

A pro of the FSBO would be that you could control whom you got in as a tenant while performing a thorough screening process. 

First your mileage for performing your services. you can write off 57.5 cents per mile. your intial expense of going into business, your books, legal, and professional services, bad debts, and business entertaining. if you operate a home office you have a few other deductions that you can use. 

I'm concerned that whichever bank I go to would be hesitant to refinance because of my age/lack of experience, despite the fact that they would be refinancing a performing asset.

Part two is, how do these costs compare with the risks and rewards of other places to park money, like flips, hard money loans or non-performing notes?