I make Pete's opinion, mine too.
In my case, my husband and I put our place in the market to be sold on October 19th, day of my husband's immigration medical exams.
We told Remax Scotland to start showing the place to prospective buyers, but telling them in advance, that the sale will take place the day after my husband's interview at US Embassy if everything was positively approved.
Even though we were still in the house, the Realtor in Scotland asked to step out for about 1 hour for him to bring over the prospective buyers (he got a group of 6 people to choose from, who wanted to buy our place). After the interview on November 22nd, leaving the US Embassy, still in London, we called the Realtor in Scotland over the phone, and told him that we were ready to go through with the sale, choosing the buyer who offered the higher amount, and who paid us in Cash.
This way we could attach the Realtor's appraisal letter with the sale price to the I-864 along the Income Tax Returns, and this way prove Asset/Income.
Ellen, in your case I am sure is going to be a very easy process, and please remember, time flies, and very fast 5 months will pass, and you will have your visa in hand.