Hi, what is the different between inter terr and semi-d???? Thansk for your reply anyway.... Hi, is to convert 1 part of the semi-d into 2 units of semi-d. That is, demolish 1 part of semi-d, making it disjoined from existing ones, and build 2 units of semi-d. As the land size is big, ard 5500sqft, there are rooms for 2 Semi-Ds on that plot of land. So the ans is a yes???