Presentation: What is a blog?

I've been asked by a Swedish commercial real estate consulting firm to make a presentation about blogs next Friday. So why not use the same tactic as Dustin Luther at Rain City Guide and ask the readers for advice. 

The key area in which I'm looking for example on blogging in the commercial real estate market.

There are tons of activity in the residential area, but how about the commercial sector of the industry. Are you aware of any commercial real estate agent that has a blog, or a property company that uses blogs for communication.

Good examples are appreciated.
Add a comment or drop me an email.

Thanks in advance.