Please see the file entitled multi-leg real estate exchange. This is courtesy of The Society of Exchange Counselors (SEC). You can find thier website at www.secounselors.com
Here is the link http://www.slideshare.net/ronseay/multi-leg-transaction-formulas or click the follwing link:
you can also download the pdf file from the mybox section on the righthand side of my blog. Just look for multi-leg transaction.