I have been writing about the real estate startup Opendoor for many years here on the blog. Another promising startup in this space is Knock, and today it was announced that they just raised a $400 million Series B round (led by Foundry Group).

They share some similarities with Opendoor, but they are also different in that their focus is on home trade-ins. They tell you what your current home is worth, help you find a new home, and then coordinate “a seamless swap.” For more on how they work, go here.

One of the ways in which they are similar to Opendoor is that they front the cash for new home purchases. In the case of Opendoor, they buy your home with the plan of selling it in the future. And with Knock, they buy your home with the understanding that your old home will get sold.

It is certainly a more capital intensive model compared to the way that home sales are handled today. But many investors are clearly betting that it is exactly what is needed to change the status quo. 

(Credit to Jeremiah Shamess for sharing the above news with me today.)