Persistant UI region for filtering section in layout

I have to include a filtering column next to the results. The filtering column needs to be a persistent UI on the bigger screens (resizes the results content while it's open). I'm having quite a few issues however. First the entire site layout is using a 1200px grid for bigger screen sizes. This leads to extra spacing on the sides of the grid 120px each (this screen size is 1440px).

Layout Example

If I put a background color in the filtering section is it okay to extend it all the way to the end of the page breaking out of the 1200px grid?

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Is this bad practice? Shouldn't the content inside of the filter section line up with the page title and breadcrumbs?

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