Correct Schema markup for real estate website

Hello, this is my first participation so forgive me if I'm asking the question in the incorrect list.


I've been using Schema.org markup for a long time on most of my projects, but this is the first time that I find it really difficult to decide which markup is the correct one.


The website I'm working on right now is for a real estate agency and aside from the RealEstateAgent markup, I'm finding it hard to decide what other markups I can use, specially for the listings.


I've found that very few Real Estate websites are using Schema.org, one of the few I found is this website: http://www.applegaterealtors.com/ they are using RealEstateAgent markup, and they also use the Offer markup for the actual listings, is that the right markup for a real estate listing? they also use SingleFamilyResidence.


I would appreciate any advice.

Thanks


Robert