Is seeing half of a duplex for sale common?

[Joe Dingee]

Hey everyone!  I'm new to this and recently started learning to analyze properties.  I'm running into quite a few duplex properties that seem like only one half is for sale.  Is this common?

[Mack Benson]

In Minnesota you can find twin homes up to quad homes where each can be owned and sold by a separate party. The easiest way I have found to tell the difference is that in the twin-quad home, each of the connected homes will have their own property ID assigned whereas a duplex to quad-plex will all be under one PID. If you are having trouble determining it on the counties website by address search most counties have a gis map tool you can use.