Iframe not scrolling to content below set height in IE9

Question

Because iframe height of 100% didn't render correctly (in any browsers) I chose a set height (600px) in which to display my clients' property listings within one of their site pages.
All works reasonably all tested browsers (double scroll bars in Chrome and Safari -- div and iframe -- despite that the div isn't set to have such, but I can likely fix that); IE9, though, is nonfunctional:  In IE9 I get a Y scrollbar, as defined, however it does not scroll past content that fits into 600 pixel iframe height.  That is, is does not scroll to show the rest of the iframe page.
I have tried separately defining x and y scrollers as well as simply calling for scrolling in general; no luck.
I have been searching for hours for a fix, and have tried every combination of style coding to the iframe itself as well as the overall style sheet (to the div).  I also read the soure for the page rendered in IE9, and the style coding was as I'd written it.
It has to be a simple fix, or others would be having this IE9 issue, too, right?
Have even added <meta http-equiv="X-UA-Compatible" content="IE=8"> to the header; didn't change anything.
Anyone know what is going on -- and how to fix it?
I apologize for how jumbled both the CSS and source code is for this site.  If I were recreating the site today, I could do a much cleaner job.
Here are a few tries:
http://cbm1.com/retail_property_listings/costar.html
http://cbm1.com/retail_property_listings/costar3.html
This version (more info in the CSS, less inline) gets rid of the double scrollers in Safari and Chrome (while still working in FF) but still the same doesn't-scroll-beyond-the-600px-iframe-pane-height issue in IE9.  Tried moving the meta directive toward IE8 to immediately above the body tag as well as first meta tag on the page; neither resulted in any IE9 rendering change:
http://cbm1.com/retail_property_listings/costar4.html
Happy to simply paste the inline + CSS coding alone in this window, if that's easier for anyone.

Answer 1

Because iframe height of 100% didn't render correctly (in any browsers) I chose a set height (600px) in which to display my clients' property listings within one of their site pages.
All works reasonably all tested browsers (double scroll bars in Chrome and Safari -- div and iframe -- despite that the div isn't set to have such, but I can likely fix that); IE9, though, is nonfunctional:  In IE9 I get a Y scrollbar, as defined, however it does not scroll past content that fits into 600 pixel iframe height.  That is, is does not scroll to show the rest of the iframe page.
I have tried separately defining x and y scrollers as well as simply calling for scrolling in general; no luck.
I have been searching for hours for a fix, and have tried every combination of style coding to the iframe itself as well as the overall style sheet (to the div).  I also read the soure for the page rendered in IE9, and the style coding was as I'd written it.
It has to be a simple fix, or others would be having this IE9 issue, too, right?
Have even added <meta http-equiv="X-UA-Compatible" content="IE=8"> to the header; didn't change anything.
Anyone know what is going on -- and how to fix it?
I apologize for how jumbled both the CSS and source code is for this site.  If I were recreating the site today, I could do a much cleaner job.
Here are a few tries:
http://cbm1.com/retail_property_listings/costar.html
http://cbm1.com/retail_property_listings/costar3.html
This version (more info in the CSS, less inline) gets rid of the double scrollers in Safari and Chrome (while still working in FF) but still the same doesn't-scroll-beyond-the-600px-iframe-pane-height issue in IE9.  Tried moving the meta directive toward IE8 to immediately above the body tag as well as first meta tag on the page; neither resulted in any IE9 rendering change:
http://cbm1.com/retail_property_listings/costar4.html
Happy to simply paste the inline + CSS coding alone in this window, if that's easier for anyone.