Threat of Tech to Real Estate valuations

[Dovid Preil]

I've had some really interesting conversations lately about the impact of technology on RE. 

Aside from some benefits, I see a lot of room for disruption. 

For example: how are 3D printed houses going to impact the value of existing houses and MF buildings? 

For a while, Amazon and e-commerce were seen as an existential threat to Retail. 

What other developments do you see negatively impacting the value of RE?