This has been annoying me for a while. On the 1st page of the 1025, under General Description, you have to check one of the boxes for Det, Att, or S-det/End Unit. Does this describe the plex as related to neighboring lots, or does it describe the relationship of units within the plex? If you have a standard duplex sitting on a lot (1 building), not touching any other buildings on any other lots, is that Detached? Or are the units Semi-detached because they share 1 building? I can't find anything on Fannie guidelines that clarifies this.