An entrepreneur must be compensated for the risk they are taking.

The instruction sheet will tell you which models can be interconnected, and you can often get that sheet as a PDF from the manufacturer's web site before you buy.I've also seen a suggestion to make sure that wired smoke alarms are powered from a circuit that also has a light on it that is used relatively often - like the light over the stairs, or the front porch light, or similar. 

You should download a copy of the IRS Pubs that include instructions for Schedule E, depreciation, and business expenses. 

You keep any difference.Transactional loans like this are considered almost risk-free to your lender since there would be instructions stating that you cannot buy the property until your buyer's lender has funded their side of the purchase, and presumably won't pull out within that few minute to few hour interim.Taking any longer than a day for you to sell your purchase to C is no longer risk-free since there is time for C's lender to pull out.

They may just decide to stay for 12 extra days, leave the house in a clean condition, and instruct you to keep the $3000 deposit. 

I now instruct them to ask, after biting the bullet & getting burnt!

The judge may or may not allow it, but I would not hesitate to file and leave it up to the judge to instruct me.What I hate in your case is that the eviction apparently didn't occur until several months' rent were missed. 

A transaction has been opened with this company and we have been instructed to request a DEMAND FORFULL PAYOFF of the Loan identified below.

I recently used on to take on a cover in a dishwasher which according to the instructions was factory sealed.

If it is not on a checklist in front of them, many bankers are just plain lost.Your Solo 401(k) provider should have given you good instructions for how to communicate your needs to a banker.