I assume you have low-interest 1st lien mortgages on those properties that you don't want to pay off. 

She could live there for years and pay off much of your home.

If it is paint, inside, perhaps but even then they pay rent and you pay them for the work they do.

If my buyer does not pay -- I do. 

I'd have to quit the business if I was paying that sort of price for an AC system. 

You have bills to pay and if they promise you your money by a certain time each month, then you should be getting it.

But making you pay half I dont believe is right .

Do you think the curbless is worth the extra work and planning required?

If it were sold through normal real estate brokerage firms, we would have to pay 6% commission, therefore I deducted 6% from the appraised value to arrive at an adjusted value  of $436,160.   

I also received no scholarship or financial aid, and would be paying the full tuition each year.