How vulnerable is the real estate industry to cyberattacks?

Depends on your definition. If you mean simply vulnerable to an exploit then they are probably more at risk. A lot of building controls don’t get patched and their staff is more likely to be cut in an economic downturn

However financially the tech sector would probably lose more money.

If someone hacks our air conditioner we can run it manually

There are only two types of companies: those who know that they have been attacked and those who are not aware of the fact that they've already been attacked, right. Cyberthreats are for real. They exist, they travel borders and real estate is no different. As an industry, we are equally susceptible to threats. 

We have to be absolutely stringent about the way we roll out our solutions. No reason for us to be left behind in terms of our security game as far as cyber threats are concerned.