Richardson specifically, but honestly most of DFW. Pretty much any apartment complex built in this area in the past 20 years is corporate owned. These days even a lot of the townhouses around are corporate owned rental units.

In fact, this area (and other places in Texas) has given rise to a new kind of apartment architecture called the "Texas Doughnut", which is a 5-over-1 apartment complex wrapping a central parking garage and often other courtyards in the middle. These things are everywhere in DFW. Just take a peek on Google Maps.

https://maps.app.goo.gl/KKHx47n7qooQCjNz9

https://maps.app.goo.gl/uqwBGv3nRrTLfWvw7

https://maps.app.goo.gl/SX9wNG1441xrWwBAA

https://maps.app.goo.gl/SL49yPkoA8VqE23F6

https://maps.app.goo.gl/MEiqBnhMF8pQjGu36

But it is not just DFW. A lot of other cities in the US have similar things going on. It seems like most cities I'm in often have most new apartments I see be corporate owned units, not a lot of individual ownership.