Over-calculation of area due to parcels occupying same space

I'm trying to get the total acreage of different parcels by land use, and unfortunately I keep getting a total of ~15000 acres instead of ~12000 because it's over-calculating the area where there are condos or other multi-units (two condos sharing the same parcel area are being counted twice instead of once). It's basically calculating the total acreage as if each condo were occupying its own land when in fact they're both occupying the same space.

How can I calculate the total acreage only on the ground level without double counting? I don't think I can combine the attributes because I would lose data on how many occupants there are.

• Are your condos represented each as the entire parcel or are there child parcels inside the main parcel for each condo? – Adam Kara Apr 29 '16 at 17:41
• They're each represented as their own parcels. – Meia Apr 29 '16 at 17:44
• !Picture. Here's a sample pic of the two condos selected. – Meia Apr 29 '16 at 17:52
• What if you dissolve the parcels and in the Statistics Fields you could calculate the sum for occupants (if you have that information in the attribute table) and/or do a spatial join on the dissolved layer with parcel (which would give you the count of parcels in the dissolve area). You could also use intersect to split the dissolved parcel layer by land use area and then do the spatial join on parcels to get the information you need – crld Apr 29 '16 at 18:34
• What GIS software are you using? – PolyGeo Apr 29 '16 at 21:29