. $34k is a lot of $ to spend on a rental unit rehab.Whoever owns this property, (it's unclear if it's actually OP's or not from the comments...?)

Subject-To financing is not super common here, especially for condos/co-ops. 

Yea i feel you there, but to me it sounded like the OP felt this person just didnt understand and he had to break it down.

You know, I just realized I didn't answer the OP's original question.

The first thing that came to my mind when reading the OP was make sure the owner of the house has a legal right to use the long driveway. 

In my experience, most title agent are very familiar with seller financing and if they're unsure as to how to handle a particular situation they can always reach out to the insurer's underwriting department who I'm sure will be able to craft a solution.I just looked at FIG's web site and it appears they are a title agent for both Fidelity National and Old Republic Title.I only responded because the OP is doing SF in WA and my hometown. 

Thank to the OP for keeping up with it and updating.

Savings accounts and treasury bonds are paying decent interest rates right now, so if OP needs a year to save up more he actually has options for the first time in years. 

I think it really depends on the buyer demographic, as far as if you are reliant on outside agents to rep buyers, then the co-op to them should be fair. 

The OP was not partnering with their spouse.