First, speak with an attorney. You will need to go through a few legal steps before doing anything.
Next, bring some agents in to look at both units so you can get prices.
Pretty easy stuff here. Good luck!
Matt Heisler is a real-estate professional and owner of Heisler & Mattson Properties. He has been selling residential real-estate for over 10 years. He has given several talks on real estate, including presentations on first-time buyer tips & tricks, and profiting in real estate investing in Massachusetts. As a Vanderbilt University alumnus, he is proud to serve the communities of Natick, Framingham, Medfield, Millis, Holliston, Hopkinton, Southborough, Westborough, Northborough, Grafton, Marlborough, Shrewsbury, Worcester, Milford, Charlton, Northbridge, Sutton, Hudson, Sudbury, Clinton, Boylston, and West Boylston. His company website can be found at http://www.bjheisler.com, and his Metrowest Blog can be read at http://HomeSellingInMass.net.
*All information is posted in good faith and is assumed to be reliable, but may rely on third party information sources.
In hindsight, I think he learned a valuable lesson. It would have been better to change to a single family attached than condo; because when trying to sell a single family attached is easier to get financed by a buyer than a condo.
Best of luck!