Try to solve someone's problem and make both parties happy. 

Another party wants to buy the certificate. 

The prevailing party to any litigation brought to enforce any provision of this Agreement shall be awarded their attorney fees and costs.

The interesting part is that i am unsure what i love to do, I am a fairly decent artist but that is not really a passion of mine its more of a part time hobby to relieve stress.

Looking for a third party to handle servicing of the house note.

Theres not enough room to partner on these types of deals and you can hire out support staff and or 3rd party management as you grow. 

Then find a sales contract and get it signed by all parties.

TTax allows multiple returns.I'm headed to the bench now as you've exceeded my risk tolerance and street knowledge since I would rather pull out my eyebrows than co-own real property with a unrelated party without a multi member LLC or a partnership with a CPA and attorney already in tow... 

In Iowa both parties share responsibility of the fence.

If you take the time to truly understand what they are seeking to accomplish through the sale of the property, you should be able to craft terms of a note that will create a win-win for both parties.