Duplex/condos a lot of times are used also for temporary living, contract employees. If someone ihas moved for the oil industry on a 2 or 3 year contract, you'll see the company they work for use a concentrated area, so there's a lot of turnover. Aside from that, there are a very limited number of these type units in the Cinco area, a highly regarded school district. So they are highly sought after when available when families grow and need more space, which happens on a regular basis. There are 4 units available at the moment if you want to go look at them. Feel free to call me.