Mystery Gap

Hi,
website: somewhereny.com
Theme: f8-Light

For the life of me I cant seem to locate the code for this gap:
http://www.flickr.com/photos/22016806@N06/5619125295/in/photostream . I want to shrink it to match my other margins. I have searched extisively with firebug to no avail, any ideas?
Thanks!!!