The purchaser may have to present that claim in case the executor does not have actual knowledge of the contract, but you are mistaken about unenforceability. 

I would expect the success rate to be well under 10% and the make back your money claim to be a best 25%.  

Thats just unrealistic to think that would continue. 

My strategy right now is to sell the land to a real estate developer to develop the home at a steep discount ($150,000) but make a claim on the stake of the overall project to get my remaining money back, plus the profit of the build. 

Do I need an attorney to file the title insurance claim at this stage?

Most people quit claim the deed to an LLC after closing on the loan.

JPMorgan out of NY - a trustee sued financial institutions claiming that broadly syndicated loans were securities. 

This applies to current year tax deductions, and you can also employ a “look back” cost seg study where you can retroactively reclaim any missed deductions from previous tax years.By filing a form 3115 and calculating the proper 481(a) adjustment, you can recapture and correct any erroneous depreciation in prior years and claim the difference in the current tax year as a lump sum.

For example, I often see Buyers purchase property thinking there is a $1,000 deposit but then the tenant claims it was $2,000 because they paid the last month's rent.

I need to fill out a quit claim deed in Oklahoma and I found the paperwork on county site but I do not know what goes where it says parts with a blank after them.