blocks per node

Hello,

I'm currently working to convert a current web site into Drupal, and there's one little thing that I need to do but am having some difficulty figuring it all out.

What I want is to have a menu appear on the left sidebar as a block for certain nodes. For example:

When you click on the primary link: Our Houses you go to mysite.com/ourhouses

When that node is displayed, there should be a block on the left sidebar displaying a menu like this:

Emerald -> mysite.com/ourhouses/emerald
Birchmont -> mysite.com/ourhouses/birchmont
Lodge -> mysite.com/ourhouses/lodge

I can't find that functionality within a base Drupal installation, but perhaps there is something out there to do this for me?

Thanks for any help!