Um no you cannot do that. You have to wait 7 days after recieving a house to accept or trade another house. I know because I tried this and had to demolish my second house then wait a few minutes and replace it. Once you trade the first accounts house to the other account(that is a trade and the timer starts for both accounts.) Only way to bypass the timer is to demolish a house and wait a couple minutes.
Are you sure? I place homes all the time using the following 'method':
I have home A.
I find a good spot and place a home, B.
Home A becomes condemned; I now own both home A and B.
I sell or trade home A without problems.
I live in home B.
Rinse and repeat.
I know there isn't a problem with
placing a house, but it may be different if you accept a house FROM someone and then try to trade off your original home. If what you are saying is true, with having to wait 7 days to trade a house, "home A" would have fallen by that time.. if you get my drift.