There are few condos and very few duplexes in Milton. Many of the condos are Adult Community or Luxury. If you are asking because you may want to flip.... the ones that have done the worst are the 2/3 fam conversions as several projects have failed and come on as distressed properties.
If you are interested in more information, please feel free to contact me... I've been a local resident for 30+ yr owned my own Milton Focused brokerage, have my construction and builder licenses and am familiar with all the areas of Milton, as well as the benefits and pitfalls of flipping / investing / purchasing in the area.
My website may be a good resource. It has direct MLS access, hard to find statistics such as all sold properties, list vs ask etc.. and updated lists of all REO/Foreclosure and short sale properties.
You can always get me at Direct Phone: 617.755.8272 or Mike@SuccessInMass.com
I can send you a report for the past 5 years on properties in Milton so you can see the market trend that has occured in this town. If you'd like me to send it contact me directly with more specific information on the condo, duplex (i.e. sq. footage. number of bedrooms & bath etc..)