It's basically the way the IRS tracks how much of your lifetime exclusion you have left (currently $5.43MM).

I think you should determine what you need done, write a scope of your work so that it is very clear what you expect and the cost of material needed to get that job done.

These are questions you need to answer to determine what is best for you.

I provide a complete acquisition and management service, covering the following.Pre-purchase inspections to determine repair/upgrades needed.Coordinating renovations and preventative maintenance.Tenant screening, writing leases, rent collection.Payment processing to vendors for repairs & routine property maintenance such as air conditioning, pest control and lawn care.  

Second there are many threads on BP with what people would do if they had x amount of $$.Before you can decide what direction you wish to go, you need to determine your goals.  

The source of our health problems was determined to be toxic black mold, ultimately resulting in the total loss of our home and the equity on which we were depending.

That will determine the circumstances under which the buyer can legally terminate the contract without penalty.

The market will determine the value... although be sure you understand the difference between value and marketability. 

IRS rules prohibit any direct or indirect provision of benefit, goods, or services, between the plan and a disqualified party - in either direction.  

If the broker has done that I assume they have already determined what avenue is more profitable and decided to go forward with the listing.