Thanks for the insight Dr. Meyers!!
Here's a little more information - my site's homepage is a PR5, I roughly have 225k rental listings and Google has indexed roughly 500k urls - combo of search results & listing pages.
I proceeded with changing the listing url structure from "domain.com/123456" to "domain.com/property/987-street-city-state-zip-123456" and 301'd the old format to the new. I know this probably had nothing to do with my traffic drop, but it's a change I've been planning to make and figured there's no better time than now.
My hunch is that my search result pages are the thin content culprits because I have them setup 2 ways:
It's completely possible to produce 2 very similar search results (however with different title, h1, etc.) via these 2 search urls. Do you think I should 301 the /rental-type/state/city/ to /rentals/state/city/? If needed, I can privately send you me site's url.
Glad you mentioned pagnation - all 2nd+ page result pages include the following meta tag:
<meta name="<a class="attribute-value">robots</a>" content="<a class="attribute-value">noindex</a>" />
And the on-page pagnation links look like - 2nd page result shown:
<div id="<a class="attribute-value">pagination</a>"> <a href="[?pos=0&min=0&max=999999&beds=0&baths=0&pets=&pics=&sortby=min_rent&orderby=asc](view-source:http://www.rentalsource.com/rentals/california/carson/?pos=0&min=0&max=999999&beds=0&baths=0&pets=&pics=&sortby=min_rent&orderby=asc)" rel="<a class="attribute-value">prev</a>">« preva>
<a href="[?pos=0&min=0&max=999999&beds=0&baths=0&pets=&pics=&sortby=min_rent&orderby=asc](view-source:http://www.rentalsource.com/rentals/california/carson/?pos=0&min=0&max=999999&beds=0&baths=0&pets=&pics=&sortby=min_rent&orderby=asc)">1a>
<span class="<a class="attribute-value">selected_page</a>">2span>
<a href="[?pos=20&min=0&max=999999&beds=0&baths=0&pets=&pics=&sortby=min_rent&orderby=asc](view-source:http://www.rentalsource.com/rentals/california/carson/?pos=20&min=0&max=999999&beds=0&baths=0&pets=&pics=&sortby=min_rent&orderby=asc)">3a>
<a href="[?pos=30&min=0&max=999999&beds=0&baths=0&pets=&pics=&sortby=min_rent&orderby=asc](view-source:http://www.rentalsource.com/rentals/california/carson/?pos=30&min=0&max=999999&beds=0&baths=0&pets=&pics=&sortby=min_rent&orderby=asc)">4a>
<a href="[?pos=40&min=0&max=999999&beds=0&baths=0&pets=&pics=&sortby=min_rent&orderby=asc](view-source:http://www.rentalsource.com/rentals/california/carson/?pos=40&min=0&max=999999&beds=0&baths=0&pets=&pics=&sortby=min_rent&orderby=asc)">5a>
<a href="[?pos=20&min=0&max=999999&beds=0&baths=0&pets=&pics=&sortby=min_rent&orderby=asc](view-source:http://www.rentalsource.com/rentals/california/carson/?pos=20&min=0&max=999999&beds=0&baths=0&pets=&pics=&sortby=min_rent&orderby=asc)" rel="<a class="attribute-value">next</a>">next »a>
div>
Do you see any issues with this setup?
I've also made a few other changes since my last message:
- used linkdetox.com to analyze my backlinks and submitted a disavow request for the "toxic" ones
- purchased a "Site Audit" from Alexa and it came back with a 96/100 score
- contacted a recommended SEO firm and they want $5k per month for 6 months to fix my problem