Link Juice from syndication of listings

If those sites allow back links and dont have a no follow and you are putting a link back in the post to wherever you want to link to then yes they would work for building links. I dont know each one specifically. Even if its few and far between there are still people there. If your competition is there why would you not want to be there? If you have Google webmaster tools installed you can see in the external links section if Google is counting these links. Just scroll through and check. You would have to check whether manually posting this changes anything. I dont do this myself. For a single property site you can build links like any other site just put a link to it in whatever you are posting the same as with your other sites.

If you sign up for a web site at  point2nls  and post your listings there, at the end of filling in the listing information there is a one click submit button that posts your listing to all those web sites that you just mentioned and many more with one click.

Having told you that, I am with you i have received very few enquiries from any of those sites in the past 2 years, so how many people are really looking there???

We just starting using listhub.net for our MLS board and we have received many requests from all sorts of different sites. It also helps to funnel traffic to your main website.

If you guys have webmaster tools then just go to where it says external links and just scroll through the list. You can drop it in a spreadsheet too. You should keep an eye on where you are building links and focus on those sites more.